Merge pull request 'chore(release): prepare 0.2.4' (#91) from chore/release-0.2.4 into main

Reviewed-on: https://git.riverofglorymn.org/River_of_Glory_Church/Ekklesia/pulls/91
Reviewed-by: The_River <[email protected]>

.dockerignore

@@ -2,6 +2,11 @@
 # `pnpm install --frozen-lockfile` and builds its own outputs, so nothing installed or built on the
 # host may enter the context, and no secret or environment file may enter any layer.
 
+# Installed modules never enter the platform image (ADR 0048): an installation keeps them in its own
+# module storage, mounted at run time. Excluding the checkout's `modules/` is what makes a build
+# identical whether or not modules happen to be present in the source tree.
+/modules
+
 # Host-installed dependencies and build outputs: the image produces its own.
 **/node_modules
 **/dist

.env.example

@@ -10,6 +10,12 @@
 # The plaintext loopback DATABASE_URL below is therefore only usable with this set.
 NODE_ENV=development
 
+# Installed modules (ADR 0048). Unset, the checkout's own modules/ is used, as module development
+# and the platform's tests expect. Set, it must be an absolute path to an existing directory;
+# anything else stops the API and every module command with a sanitized error. The production
+# image sets /var/lib/ekklesia/modules.
+# EKKLESIA_MODULES_DIR=/absolute/path/to/modules
+
 POSTGRES_DB=ekklesia
 POSTGRES_USER=ekklesia
 POSTGRES_PASSWORD=ekklesia-development-only

.gitattributes

@@ -6,3 +6,7 @@
 *.gif binary
 *.webp binary
 *.woff2 binary
+
+# Reviewed license supplements are named by the SHA-256 of their exact bytes (ADR 0052), so Git must
+# never rewrite their line endings.
+packages/module-pack/license-supplements/** -text

.github/workflows/ci.yml

@@ -128,6 +128,129 @@ jobs:
         if: always()
         run: bash scripts/ci-sweep.sh --job
 
+  package-release:
+    needs: verify
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    # What the gate proved, for the job that consumes its artifact to check it received exactly that.
+    outputs:
+      version: ${{ steps.release.outputs.version }}
+      revision: ${{ steps.release.outputs.revision }}
+      manifest_sha256: ${{ steps.release.outputs.manifest_sha256 }}
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          # `actions/checkout` defaults to leaving the job token in `.git/config`, where any later
+          # step — including one a pull request added to this file — could read or reuse it. Nothing
+          # in this workflow pushes, so the credential is never needed after checkout.
+          persist-credentials: false
+
+      - name: Set up Node.js
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version-file: .node-version
+
+      - name: Activate pinned pnpm
+        run: |
+          corepack enable
+          corepack prepare [email protected] --activate
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      # ADR 0053's package release gate: build the public package train from this commit, build it
+      # again from a second checkout and require byte-identical artifacts, then install exactly those
+      # tarballs (offline, no registry) into a module outside this repository and prove it builds,
+      # packages, and verifies. Nothing is published and no credential exists here. A future publish
+      # job must depend on this job and publish only the artifacts it proved.
+      - name: Build, reproduce, and consume the public package train
+        run: pnpm test:package-release --keep package-train
+
+      - name: Describe the proven release train
+        id: release
+        run: |
+          release="$(find package-train -mindepth 1 -maxdepth 1 -type d)"
+          manifest="$release/ekklesia-package-train.json"
+          {
+            echo "version=$(node -p 'JSON.parse(require("fs").readFileSync(process.argv[1], "utf8")).version' "$manifest")"
+            echo "revision=$(node -p 'JSON.parse(require("fs").readFileSync(process.argv[1], "utf8")).source.revision' "$manifest")"
+            echo "manifest_sha256=$(sha256sum "$manifest" | cut -d' ' -f1)"
+          } >>"$GITHUB_OUTPUT"
+          cat "$manifest"
+
+      # The exact release artifacts, for the jobs that consume them, from a directory whose name does
+      # not start with a dot: the artifact actions leave hidden files out. Version 3 of the artifact
+      # actions: version 4 refuses any server that is not github.com, which this Gitea is not, while
+      # Gitea implements the protocol version 3 uses. A consumer checks the files, not the wrapper.
+      - name: Hand the release train on
+        uses: actions/upload-artifact@c6a3b2bd78b3985e4b2f15397fec357f0fd808de # v3.2.2-node20
+        with:
+          name: package-train
+          path: package-train/
+          if-no-files-found: error
+          retention-days: 7
+
+  # The publication tool, given exactly the artifact the package-release job proved, against a
+  # disposable Gitea 1.27.2 (scripts/test-package-publication.sh). Never the real registry, and no
+  # credential: the disposable registry's accounts are created and discarded inside the job.
+  package-publication:
+    needs: package-release
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    env:
+      # Names this job's stacks, so its final step removes exactly these (scripts/lib/ci-project.sh).
+      EKKLESIA_CI_JOB_KEY: package-publication
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      # A job the runner killed (cancelled, or past the runner's own time limit) never ran its
+      # cleanup. Anything a CI job left on this shared daemon more than three hours ago goes first.
+      - name: Sweep stale CI stacks from the runner
+        run: bash scripts/ci-sweep.sh --stale
+
+      - name: Set up Node.js
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version-file: .node-version
+
+      - name: Activate pinned pnpm
+        run: |
+          corepack enable
+          corepack prepare [email protected] --activate
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Receive the release train the gate proved
+        uses: actions/download-artifact@ad191675b41f6a5b46da9a048cb6893812da158b # v3.1.0-node20
+        with:
+          name: package-train
+          path: package-train/
+
+      - name: Check it is exactly that train
+        env:
+          EXPECTED_MANIFEST_SHA256: ${{ needs.package-release.outputs.manifest_sha256 }}
+        run: |
+          release="$(find package-train -mindepth 1 -maxdepth 1 -type d)"
+          actual="$(sha256sum "$release/ekklesia-package-train.json" | cut -d' ' -f1)"
+          if [[ -z "$EXPECTED_MANIFEST_SHA256" || "$actual" != "$EXPECTED_MANIFEST_SHA256" ]]; then
+            echo "The received release manifest is not the one the package-release job proved." >&2
+            exit 1
+          fi
+          (cd "$release" && sha256sum --check --strict SHA256SUMS)
+
+      - name: Publish it to a disposable Gitea, and prove the round trip and recovery
+        run: bash scripts/test-package-publication.sh --release "$(find package-train -mindepth 1 -maxdepth 1 -type d)"
+
+      # Whatever happened above, this job's own stacks do not outlive it.
+      - name: Remove this job's CI stacks
+        if: always()
+        run: bash scripts/ci-sweep.sh --job
+
   image-build:
     needs: verify
     runs-on: ubuntu-latest
@@ -152,23 +275,14 @@ jobs:
       - name: Sweep stale CI stacks from the runner
         run: bash scripts/ci-sweep.sh --stale
 
-      # The platform-only image (ADR 0044): a checkout has no `modules/`, so this proves the image
+      # The one generic platform image (ADR 0044, ADR 0048), proved rather than assumed: it contains no
-      # builds, validates, and assembles with zero modules. Build only — no registry login, no
+      # module, no module template, and no module manifest; its module storage mount point is empty;
-      # credentials, no push, no tag anywhere but this runner's local image store.
+      # EKKLESIA_MODULES_DIR names it; and a checkout with a populated modules/ directory builds an
-      # Tagged per run and attempt, not only per commit: a pull request and a push of the same commit
+      # identical runtime file system. Build only — no registry login, no credentials, no push, no tag
-      # can build at once on one runner's Docker daemon, and neither may remove the other's image.
+      # anywhere but this runner's local image store. Tagged per run and attempt, and labeled like
-      # Labeled like every CI stack, so this job's final step removes it even if the build is killed.
+      # every CI stack, so this job's final step removes the images even if a build is killed.
-      - name: Build the production image without modules
+      - name: Build the generic platform image and prove it holds no modules
-        shell: bash
+        run: bash scripts/check-image.sh
-        run: |
-          source scripts/lib/ci-project.sh
-          docker build \
-            --file deploy/Dockerfile \
-            --build-arg REVISION="$GITHUB_SHA" \
-            --label "${EKKLESIA_CI_LABEL}=$(ci_project_name image)" \
-            --label "${EKKLESIA_CI_CREATED_LABEL}=$(date +%s)" \
-            --tag ekklesia-ci:"$GITHUB_SHA-${GITHUB_RUN_ID:-0}-${GITHUB_RUN_ATTEMPT:-1}" \
-            .
 
       # Whatever happened above, this job's own stacks do not outlive it.
       - name: Remove this job's CI stacks
@@ -179,8 +293,9 @@ jobs:
     needs: verify
     runs-on: ubuntu-latest
     timeout-minutes: 30
-    # Both topologies (ADR 0045): same-origin, the default every installation gets, and split, which
+    # Both topologies (ADR 0045), each on the one generic image: same-origin, the default every
-    # adds a test-only module and drives a real headless browser across the two origins.
+    # installation gets, and split, which installs a test-only module into module storage, removes
+    # it, and restores it (ADR 0048), and drives a real headless browser across the two origins.
     strategy:
       fail-fast: false
       matrix:
@@ -206,7 +321,7 @@ jobs:
       - name: Sweep stale CI stacks from the runner
         run: bash scripts/ci-sweep.sh --stale
 
-      # The reference deployment end to end (ADR 0044): a platform-only image, base + proxy with
+      # The reference deployment end to end (ADR 0044): the generic platform image, base + proxy with
       # Caddy's internal CA (test-only), an explicit migration apply against this job's own fresh
       # PostgreSQL, then the API, Dashboard, storage delivery, client-address chain, and verify-full
       # database TLS through the proxy. Every secret is generated for this run and discarded with

.github/workflows/publish-packages.yml

@@ -0,0 +1,133 @@
+name: Publish packages
+
+# Publishes one public @ekklesia/* package train (ADR 0053, docs/development/releases.md) to the
+# npm registry: exactly the artifacts this run's package-release gate proves, and nothing else.
+#
+# Only ever started by hand, on `main`, by someone with write access to this repository: no pull
+# request or push can start it. It needs the version-set commit of a release (`version` must equal
+# the platform version there), and the repository secret EKKLESIA_PACKAGES_PUBLISH_TOKEN, a token of
+# the dedicated publisher account with only the `write:package` scope. Packages are publicly
+# readable (ADR 0054); publishing is what this protects.
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: The package train version to publish, equal to the platform version on main.
+        required: true
+        type: string
+
+permissions:
+  contents: read
+
+# Never cancel a publication part way, and never run two at once. A rerun resumes safely.
+concurrency:
+  group: publish-packages
+  cancel-in-progress: false
+
+env:
+  # The only registry-specific setting: where the train is published.
+  EKKLESIA_PACKAGES_REGISTRY: https://git.riverofglorymn.org/api/packages/River_of_Glory_Church/npm/
+
+jobs:
+  package-release:
+    if: github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    outputs:
+      version: ${{ steps.release.outputs.version }}
+      revision: ${{ steps.release.outputs.revision }}
+      manifest_sha256: ${{ steps.release.outputs.manifest_sha256 }}
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Set up Node.js
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version-file: .node-version
+
+      - name: Activate pinned pnpm
+        run: |
+          corepack enable
+          corepack prepare [email protected] --activate
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      # The same credential-free gate as CI: build, reproduce, and consume the train.
+      - name: Build, reproduce, and consume the public package train
+        run: pnpm test:package-release --keep package-train
+
+      - name: Describe the proven release train
+        id: release
+        run: |
+          release="$(find package-train -mindepth 1 -maxdepth 1 -type d)"
+          manifest="$release/ekklesia-package-train.json"
+          {
+            echo "version=$(node -p 'JSON.parse(require("fs").readFileSync(process.argv[1], "utf8")).version' "$manifest")"
+            echo "revision=$(node -p 'JSON.parse(require("fs").readFileSync(process.argv[1], "utf8")).source.revision' "$manifest")"
+            echo "manifest_sha256=$(sha256sum "$manifest" | cut -d' ' -f1)"
+          } >>"$GITHUB_OUTPUT"
+
+      # Artifact actions version 3: version 4 refuses any server that is not github.com. The directory
+      # name must not start with a dot: the artifact actions leave hidden files out.
+      - name: Hand the release train on
+        uses: actions/upload-artifact@c6a3b2bd78b3985e4b2f15397fec357f0fd808de # v3.2.2-node20
+        with:
+          name: package-train
+          path: package-train/
+          if-no-files-found: error
+          retention-days: 90
+
+  publish:
+    needs: package-release
+    if: github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      # Only for the publication tool itself: nothing is built or installed in this job.
+      - name: Check out repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Set up Node.js
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version-file: .node-version
+
+      - name: Receive the release train the gate proved
+        uses: actions/download-artifact@ad191675b41f6a5b46da9a048cb6893812da158b # v3.1.0-node20
+        with:
+          name: package-train
+          path: package-train/
+
+      # The tool validates the whole train against its manifest, that manifest against the gate's,
+      # its version against the request, and its revision against this commit, before it sends
+      # anything; then publishes, verifies every package byte for byte, and moves `latest` last.
+      - name: Publish the exact release train
+        env:
+          EKKLESIA_PACKAGES_PUBLISH_TOKEN: ${{ secrets.EKKLESIA_PACKAGES_PUBLISH_TOKEN }}
+          TRAIN_VERSION: ${{ inputs.version }}
+          TRAIN_REVISION: ${{ github.sha }}
+          MANIFEST_SHA256: ${{ needs.package-release.outputs.manifest_sha256 }}
+        run: |
+          node scripts/publish-package-train.ts \
+            --release "$(find package-train -mindepth 1 -maxdepth 1 -type d)" \
+            --registry "$EKKLESIA_PACKAGES_REGISTRY" \
+            --version "$TRAIN_VERSION" \
+            --revision "$TRAIN_REVISION" \
+            --manifest-sha256 "$MANIFEST_SHA256" \
+            --record publication-record.json \
+            --require-public-read
+
+      - name: Keep the publication record
+        uses: actions/upload-artifact@c6a3b2bd78b3985e4b2f15397fec357f0fd808de # v3.2.2-node20
+        with:
+          name: package-train-publication-record
+          path: publication-record.json
+          if-no-files-found: error
+          retention-days: 90

.gitignore

@@ -1,4 +1,8 @@
 node_modules/
+# pnpm's content-addressed package store. pnpm keeps it beside node_modules on the same file system,
+# so when the checkout is its own mount (a CI runner's workspace volume, a bind-mounted container),
+# `pnpm install` creates it here, at the checkout's root. A package cache, never source.
+.pnpm-store/
 .turbo/
 coverage/
 dist/
@@ -16,3 +20,11 @@ generated/*
 
 core/.identity-schema-reference.ts
 core/.identity-schema-check-*
+
+# The packager tests copy fixture modules here (packages/module-pack/tests/support/fixture-module.ts).
+packages/module-pack/.fixtures/
+
+# `pnpm packages:release` writes package release trains here (scripts/package-release.ts).
+.package-release/
+# CI keeps the proven release here to hand it on as a workflow artifact (scripts/test-package-release.sh --keep).
+/package-train/

CLAUDE.md

@@ -78,6 +78,13 @@ ever disagree:
 - `pnpm test:migrations:integration` — live, disposable-PostgreSQL evidence: migration discovery,
   planning, and execution, plus the `apps/api` HTTP transport (signup, sign-in, principal
   resolution, sign-out). Requires Docker. Run this for any change touching either area.
+- `pnpm test:package-release` — builds the public `@ekklesia/*` package train, proves it
+  reproducible, and proves a standalone module consumes exactly those tarballs. Publishes nothing.
+  Run it for any change to the public packages or their release tooling.
+- `pnpm test:package-publication` — publishes a release train to a disposable Gitea (Docker) and
+  proves the publication tool. Never the real registry. The real publication is the manual
+  `Publish packages` workflow only; never run `scripts/publish-package-train.ts` against the real
+  registry without the user's explicit intent.
 - `pnpm doctor` — read-only local readiness report. Never treat it as a substitute for `pnpm
   verify` or the integration suite.
 - `pnpm migrations:plan` / `pnpm migrations:apply` — read-only planning vs. mutating execution

LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community.  It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
+this license.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU Affero General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
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+
+  To "modify" a work means to copy from or adapt all or part of the work
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+  A "covered work" means either the unmodified Program or a work based
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+  "Additional permissions" are terms that supplement the terms of this
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+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
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+remove any additional permissions from that copy, or from any part of
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+  Each time you convey a covered work, the recipient automatically
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+
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+Program, your modified version must prominently offer all users
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+permission to link or combine any covered work with a work licensed
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+  14. Revised Versions of this License.
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+  The Free Software Foundation may publish revised and/or new versions of
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+  If the Program specifies that a proxy can decide which future
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+  15. Disclaimer of Warranty.
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -35,6 +35,48 @@ concurrency and release, exact destructive approvals, and sanitization against t
 adapter. A Core-owned `pnpm doctor` dashboard combines the existing static discovery and read-only
 migration-planning services into one concise readiness report.
 
+**Ekklesia ships one generic image, and installed modules live outside it
+([ADR 0048](docs/architecture/decisions/0048-generic-image-and-installed-module-storage.md)).** The
+production image built from [`deploy/Dockerfile`](deploy/Dockerfile) contains zero feature modules
+and is the same for every installation. Installed modules live in installation-owned module storage,
+selected by `EKKLESIA_MODULES_DIR` (`/var/lib/ekklesia/modules` in the image, the checkout's
+`modules/` when unset) and mounted read-only by the reference deployment. Each installed module is a
+self-contained directory carrying its own production dependencies. Installing, updating, or removing
+a module needs only a controlled restart and, when it has migrations, an explicit plan and apply.
+Nothing is hot loaded. Removing a module's code keeps its data and its stored state; its applied
+migration history is retained and reported, and blocks no other migration. A module is distributed
+as one **Ekklesia Module Package v1**
+([ADR 0049](docs/architecture/decisions/0049-module-package-v1.md)): a deterministic `.tar.gz` and
+its SHA-256, produced by the canonical packager (`@ekklesia/module-pack`) with the module's backend
+bundled, and checked by Core's verifier before it is installed. Two targets exist:
+- the portable `any` target, for pure-JavaScript modules;
+- `linux-x64-glibc`, for modules with a native dependency such as `sharp`. Its native runtime
+  packages are carried as real files under the package's `node_modules`, and the verifier checks the
+  host before anything is loaded.
+
+Every package records the module's validated SPDX expression and carries its explicitly
+supplied `LICENSE` bytes; dependency material remains separate in `THIRD_PARTY_NOTICES`. ABI-v1
+packages may bundle a module-owned Drizzle version without coupling it to Core;
+legacy-v8 packages retain their transitional exact-version check. Where a redistributed dependency
+omits licence material, the packager may add reviewed licence supplements
+([ADR 0052](docs/architecture/decisions/0052-reviewed-license-supplements.md)). A native package that
+redistributes LGPL or MPL code is distributed publicly only with its corresponding-source artifact,
+which `ekklesia-corresponding-source` builds and gates
+([ADR 0055](docs/architecture/decisions/0055-corresponding-source-artifacts.md)). Purge, other
+operating-system or CPU targets, signing, and any installer or marketplace do not exist yet.
+
+A module can be built in its own repository from Ekklesia's public module-development packages
+([ADR 0053](docs/architecture/decisions/0053-standalone-module-development-packages.md)):
+a curated `@ekklesia/module-sdk`, `@ekklesia/module-database`, the UI packages, and the build and
+packaging tools. They are released as one coordinated train of tarballs with a release manifest,
+and CI proves on every run that two builds of a commit are byte-identical and that a module outside
+the repository installs, builds, packages, and verifies from those artifacts alone. A manual
+workflow, the only way to publish, publishes exactly those artifacts to the npm registry and
+verifies every package byte for byte. Anyone may read and install the packages before launch
+([ADR 0054](docs/architecture/decisions/0054-public-package-reads-before-launch.md)). The first train
+published will be the next platform release
+([Releases and the public package train](docs/development/releases.md)).
+
 Phase 4A added Core-owned identity foundations: a Core-owned Better Auth database schema
 (`ekklesia_core_user`, `ekklesia_core_session`, `ekklesia_core_account`,
 `ekklesia_core_verification`), a first-class Core-owned migration source that coexists with
@@ -490,8 +532,8 @@ reported `blocked · configuration_missing · bucket` — never imported, never
 from inside its own `start` hook — and its required dependents block behind it through ADR 0028's
 existing mechanism. Doctor and `pnpm modules:validate` report the same thing while still importing no
 module code. That change introduced `manifestVersion: 5` as a hard cutover; the current strict
-manifest is version 7 after ADR 0033 added the optional display declaration and ADR 0041 added
+manifest is version 8 after ADR 0050 added the optional database ABI declaration. Version 8 is a
-browser contributions.
+hard cutover; a version 7 source module or package must be updated and rebuilt.
 
 **Ekklesia does not store secrets, and does not pretend to.** There is no encryption at rest here and
 no key management, so a `secret` key's value is supplied by the deployment
@@ -825,7 +867,7 @@ is versioned with no dual acceptance; migrating is one `pnpm build`.
 
 Phase 8 pass 3 lets one module contribute a browser renderer to a capability another module provides
 ([ADR 0041](docs/architecture/decisions/0041-module-browser-contributions.md)) — the browser half of
-the capability system Core has had since Phase 1. `manifestVersion: 7` declares a namespaced id, its
+the capability system Core has had since Phase 1. `manifestVersion: 8` declares a namespaced id, its
 own version, a target capability, a compatible range, and one artifact, and nothing else: there is no
 payload schema, slot, ordering, or rendering hint anywhere, so Core cannot learn what any of it
 means. Publication requires that another eligible module provides the capability inside the declared
@@ -1056,5 +1098,27 @@ environment.
 - [Module development](docs/module-development/README.md)
 - [Architecture decisions](docs/architecture/decisions/README.md)
 
-No open-source license has been selected yet. A license should be added only after the project
+## License
-owner makes that decision.
+
+Ekklesia is licensed under the **GNU Affero General Public License, version 3 or any later version**
+(SPDX `AGPL-3.0-or-later`). The full text of version 3 is in [LICENSE](LICENSE). Its source is
+available to you under the terms of that license.
+
+> Ekklesia is free software: you can redistribute it and/or modify it under the terms of the GNU
+> Affero General Public License as published by the Free Software Foundation, either version 3 of
+> the License, or (at your option) any later version.
+>
+> Ekklesia is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+> the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero
+> General Public License for more details.
+>
+> You should have received a copy of the GNU Affero General Public License along with Ekklesia. If
+> not, see <https://www.gnu.org/licenses/>.
+
+Section 13 of the license adds an obligation for network use: if you modify Ekklesia and run your
+modified version for users who interact with it remotely over a network, your version must offer
+those users the opportunity to receive its Corresponding Source.
+
+Official Ekklesia modules, published by the Ekklesia project, are licensed under `AGPL-3.0-or-later`
+as well. Each module's own repository declares its license. The module template declares it in its
+`package.json`, so a module started from the template begins with the same license.

apps/api/package.json

@@ -1,6 +1,7 @@
 {
   "name": "@ekklesia/api",
-  "version": "0.1.2",
+  "version": "0.2.4",
+  "license": "AGPL-3.0-or-later",
   "private": true,
   "type": "module",
   "files": [

apps/api/src/app.ts

@@ -1,6 +1,5 @@
 import {
   isAuthenticatedPrincipal,
-  type ModuleRuntimeServices,
   type ModuleSecretSource,
   type RegisteredModuleHttpRoute,
 } from "@ekklesia/contracts";
@@ -13,6 +12,7 @@ import type { DashboardStore } from "@ekklesia/core/dashboard";
 import type { DeviceStore } from "@ekklesia/core/devices";
 import { type EkklesiaIdentityRuntime, IdentityRuntimeError } from "@ekklesia/core/identity";
 import type {
+  AnyModuleRuntimeServices,
   DiscoveredModule,
   ModuleConfigurationLookup,
   ModuleConfigurationSettings,
@@ -20,6 +20,7 @@ import type {
   ModuleLifecycleSnapshot,
   ModuleLifecycleStore,
   ModuleRealtimeRegistry,
+  ModuleRuntimeServicesLookup,
   ModuleStorageLookup,
   ModuleUiPublicationRegistry,
 } from "@ekklesia/core/modules";
@@ -62,11 +63,10 @@ export interface CreateApiAppOptions {
   /** The started runtime's immutable module-owned realtime registry. Required explicitly even when
    * empty, for the same reason as module routes: application composition never guesses what ran. */
   readonly moduleRealtime: ModuleRealtimeRegistry;
-  /** The same frozen services object the caller's started module runtime already passed to every
+  /** The same per-module service lookup the caller's started module runtime used for every
-   * module's `start`/`stop` hooks (`apps/api/src/server.ts`) — reference-identical, never a fresh
+   * module's `start`/`stop` hooks (`apps/api/src/server.ts`) — each handler receives its module's
-   * object built here, so a module's HTTP handlers and lifecycle hooks share exactly one
+   * reference-identical service object, never a fresh facade or executor built per request. */
-   * `ModuleDatabase` for the lifetime of this API runtime. */
+  readonly moduleServices: ModuleRuntimeServicesLookup | AnyModuleRuntimeServices;
-  readonly moduleServices: ModuleRuntimeServices;
   /** The platform's module UI publication policy — always the one Core builds from the exact
    * discovered inventory this runtime started (`createModuleUiPublicationRegistry`,
    * `apps/api/src/server.ts`). Required rather than defaulted, for the same reason `moduleRoutes`

apps/api/src/database.ts

@@ -1,4 +1,4 @@
-import type { ModuleDatabase } from "@ekklesia/contracts";
+import type { ModuleDatabaseExecutor, ModuleId } from "@ekklesia/contracts";
 import {
   type AuthorizationDrizzleDatabase,
   createAuthorizationDrizzleView,
@@ -12,9 +12,11 @@ import { createDeviceDrizzleView, type DeviceDrizzleDatabase } from "@ekklesia/c
 import { createIdentityDrizzleView, type IdentityDrizzleDatabase } from "@ekklesia/core/identity";
 import {
   createModuleConfigurationView,
+  createModuleDatabaseExecutor,
   createModuleDatabaseView,
   createModuleLifecycleView,
   type ModuleConfigurationDrizzleDatabase,
+  type ModuleDatabase,
   type ModuleLifecycleDrizzleDatabase,
 } from "@ekklesia/core/modules";
 
@@ -24,6 +26,8 @@ export interface ApiDatabaseHandle {
   readonly dashboard: DashboardDrizzleDatabase;
   readonly identity: IdentityDrizzleDatabase;
   readonly module: ModuleDatabase;
+  /** Builds one ABI-v1 executor attributed to exactly one module, over this handle's shared pool. */
+  readonly moduleExecutor: (moduleId: ModuleId) => ModuleDatabaseExecutor;
   readonly moduleConfiguration: ModuleConfigurationDrizzleDatabase;
   readonly moduleLifecycle: ModuleLifecycleDrizzleDatabase;
   /**
@@ -76,6 +80,7 @@ export function createApiDatabase(
     dashboard: createDashboardDrizzleView(pool),
     identity: createIdentityDrizzleView(pool),
     module: createModuleDatabaseView(pool),
+    moduleExecutor: (moduleId: ModuleId) => createModuleDatabaseExecutor(pool, { moduleId }),
     moduleConfiguration: createModuleConfigurationView(pool),
     moduleLifecycle: createModuleLifecycleView(pool),
     ping: async (statementTimeoutMs: number) => {

apps/api/src/module-http-routes.ts

@@ -1,14 +1,17 @@
 import {
   EMPTY_MODULE_CONFIGURATION,
   EMPTY_MODULE_STORAGE,
+  type ModuleDatabaseExecutor,
   type ModuleId,
   type ModuleRouteHandlerContext,
-  type ModuleRuntimeServices,
   type RegisteredModuleHttpRoute,
 } from "@ekklesia/contracts";
 import type {
+  AnyModuleRuntimeServices,
   ModuleConfigurationLookup,
+  ModuleDatabase,
   ModuleRealtimeRegistry,
+  ModuleRuntimeServicesLookup,
   ModuleStorageLookup,
 } from "@ekklesia/core/modules";
 import type { Context, Hono } from "hono";
@@ -37,14 +40,14 @@ export interface ModuleHttpRoutesOptions extends AuthorizationMiddlewareOptions
    * received for this API runtime — never a fresh one built per request, and never touched for a
    * denied, trusted-origin-rejected, or `OPTIONS` request, since a handler is only ever invoked
    * after authorization succeeds. */
-  readonly services: ModuleRuntimeServices;
+  readonly services: ModuleRuntimeServicesLookup | AnyModuleRuntimeServices;
   /**
    * Per-module frozen configuration snapshots — the exact map the module runtime started from
    * (ADR 0029), so a handler and that module's `start`/`stop` hooks receive the identical object
    * rather than two independently resolved values. A module with no entry receives
    * `EMPTY_MODULE_CONFIGURATION`, so `context.config` is always present.
    *
-   * Unlike `services`, which is one shared object, this is keyed by module id: a handler can only
+   * Like `services`, this is keyed by module id: a handler can only
    * ever reach its own module's configuration, because that is the only entry looked up for it.
    */
   readonly configurations: ModuleConfigurationLookup;
@@ -232,6 +235,11 @@ export function mountModuleHttpRoutes(
     if (!options.registry.has(route.permission)) {
       throw new ModuleRouteConfigurationError();
     }
+    const services =
+      "get" in options.services ? options.services.get(route.moduleId) : options.services;
+    if (!services) {
+      throw new ModuleRouteConfigurationError();
+    }
 
     const requireRoutePermission = requirePermission(middlewareOptions, route.permission);
     // The route's own conscious body contract (`route.maxBodyBytes` — 0 means no body accepted at
@@ -243,19 +251,24 @@ export function mountModuleHttpRoutes(
     const routeBodyLimit = platformBodyLimit(route.maxBodyBytes, route.bodyMode);
     const path = moduleRoutePath(route.moduleId, route.path);
     const finalHandler = async (c: Context): Promise<Response> => {
-      const context: ModuleRouteHandlerContext = Object.freeze({
+      const context = Object.freeze({
         config: options.configurations.get(route.moduleId) ?? EMPTY_MODULE_CONFIGURATION,
         moduleId: route.moduleId,
         storage: options.storages.get(route.moduleId) ?? EMPTY_MODULE_STORAGE,
         params: Object.freeze({ ...c.req.param() }),
         principal: getAuthorizedPrincipal(c),
         realtime: options.realtime.publisherFor(route.moduleId),
-        services: options.services,
+        services,
-      });
+      }) as ModuleRouteHandlerContext<ModuleDatabase | ModuleDatabaseExecutor>;
 
       let response: Response;
       try {
-        response = await route.handler(c.req.raw, context);
+        response = await (
+          route.handler as (
+            request: Request,
+            context: ModuleRouteHandlerContext<ModuleDatabase | ModuleDatabaseExecutor>,
+          ) => PromiseLike<Response> | Response
+        )(c.req.raw, context);
       } catch {
         return sanitizedModuleHandlerFailure(c);
       }

apps/api/src/platform-permissions.ts

@@ -6,6 +6,7 @@ import {
   composePlatformPermissionRegistry,
   discoverModules,
   type DiscoveredModule,
+  resolveModulesDirectory,
 } from "@ekklesia/core/modules";
 
 export type PlatformPermissionConfigurationErrorCode = "PLATFORM_PERMISSION_CONFIGURATION_INVALID";
@@ -55,10 +56,18 @@ async function readPackageVersion(packagePath: string): Promise<string> {
 }
 
 export interface PrepareStartupModuleInventoryOptions {
+  /**
+   * The deployment's `EKKLESIA_MODULES_DIR`, raw, exactly as host configuration read it (ADR 0048).
+   * A production input, not a test seam: the executable entry point always passes it. Unset means
+   * the repository's own `modules/`; set means that absolute directory, which must exist. It is
+   * resolved by Core's one resolver, so an unusable value fails startup with a sanitized
+   * `ModuleDiscoveryError` before any pool exists.
+   */
+  readonly configuredModulesDirectory?: string | undefined;
   /** Test-only escape hatch: overrides the directory module discovery scans for installed
-   * modules. Never set by the executable entry point — production always discovers the real
+   * modules, taking precedence over `configuredModulesDirectory`, which is then never resolved.
-   * repository's `modules/` directory. Platform and Module SDK versions are always read from the
+   * Never set by the executable entry point. Platform and Module SDK versions are always read from
-   * real repository's own `package.json` files regardless of this override. */
+   * the real repository's own `package.json` files regardless of this override. */
   readonly modulesDirectoryOverride?: string;
   /** Test-only escape hatch: supplies an already-discovered module list directly, skipping the
    * filesystem discovery step entirely, while still running the real `composePlatformPermissionRegistry`
@@ -109,6 +118,11 @@ export async function prepareStartupModuleInventory(
   }
 
   const repositoryRoot = resolveRepositoryRoot();
+  // Chosen before anything is read, so an unusable configured directory fails first and alone.
+  const modulesDirectory =
+    options.modulesDirectoryOverride === undefined
+      ? resolveModulesDirectory({ configured: options.configuredModulesDirectory, repositoryRoot })
+      : { modulesDirectory: options.modulesDirectoryOverride, modulesDirectoryRequired: false };
   const [platformVersion, moduleSdkVersion] = await Promise.all([
     readPackageVersion(path.join(repositoryRoot, "package.json")),
     readPackageVersion(path.join(repositoryRoot, "packages/module-sdk/package.json")),
@@ -116,7 +130,7 @@ export async function prepareStartupModuleInventory(
 
   const modules = await discoverModules({
     moduleSdkVersion,
-    modulesDirectory: options.modulesDirectoryOverride ?? path.join(repositoryRoot, "modules"),
+    ...modulesDirectory,
     platformVersion,
   });
 

apps/api/src/server.ts

@@ -1,11 +1,7 @@
 import type { Socket } from "node:net";
 import path from "node:path";
 import { pathToFileURL } from "node:url";
-import {
+import { EMPTY_MODULE_SECRET_SOURCE, type ModuleSecretSource } from "@ekklesia/contracts";
-  EMPTY_MODULE_SECRET_SOURCE,
-  type ModuleRuntimeServices,
-  type ModuleSecretSource,
-} from "@ekklesia/contracts";
 import {
   createAuthorizationEvaluator,
   createAuthorizationStore,
@@ -21,12 +17,14 @@ import {
 } from "@ekklesia/core/identity";
 import { createSmtpMailProvider, type MailProvider } from "@ekklesia/core/mail";
 import {
+  type AnyModuleRuntimeServices,
   createModuleConfigurationStore,
   createModuleLifecycleStore,
   createModuleUiPublicationRegistry,
   type DiscoveredModule,
   type ModuleConfigurationSettings,
   type ModuleEligibilityResolution,
+  type ModuleRuntimeServicesLookup,
   resolveModuleEligibility,
   type StartedModuleRuntime,
   startDiscoveredModuleRuntime,
@@ -154,8 +152,12 @@ export interface StartApiOptions {
    * test needs somewhere to observe the operational failure the user is never shown.
    */
   readonly reportNotificationFailure?: IdentityNotificationReporter;
-  /** Test-only escape hatch: overrides the directory module discovery scans. Never set by the
+  /** The deployment's raw `EKKLESIA_MODULES_DIR` (ADR 0048), a production input the executable
-   * executable entry point. See `prepareStartupModuleInventory`. */
+   * entry point always passes from host configuration. See `prepareStartupModuleInventory`. */
+  readonly configuredModulesDirectory?: string | undefined;
+  /** Test-only escape hatch: overrides the directory module discovery scans, taking precedence
+   * over `configuredModulesDirectory`. Never set by the executable entry point. See
+   * `prepareStartupModuleInventory`. */
   readonly modulesDirectoryOverride?: string;
   /** Test-only escape hatch: supplies an already-discovered module list directly, skipping
    * filesystem discovery entirely — this exact list drives both permission composition and module
@@ -389,16 +391,13 @@ function bindServer(
  *    (`prepareStartupModuleInventory`, `./platform-permissions.js`).
  * 2. Construct the one shared PostgreSQL pool (identity, authorization, and the module database
  *    facade each get a typed Drizzle view over it — see `./database.js`).
- * 3. Construct the frozen `ModuleRuntimeServices` (currently just `database`) from that same pool,
+ * 3. Construct the Core identity runtime, authorization store, and evaluator from that pool.
- *    then the Core identity runtime, authorization store, and evaluator.
  * 4. Read the stored module enablement configuration and resolve, from that exact same discovered
  *    inventory, which modules are eligible to run (`resolveModuleEligibility`).
  * 5. Start the module runtime from the eligible subset (`startDiscoveredModuleRuntime`) — never
- *    rediscovering modules a second time — passing it the same services object every module's
+ *    rediscovering modules a second time — passing the manifest-selected service map.
- *    `start`/`stop` hook receives.
  * 6. Create the Hono application, mounting the started module runtime's published routes, publishing
- *    UI for that same eligible set, and passing the exact same services object to every module HTTP
+ *    UI for that same eligible set, and passing the same per-module service map to HTTP handlers.
- *    handler.
  * 7. Bind the Node HTTP server.
  *
  * Discovery and permission composition happen before any pool, Better Auth instance, module
@@ -429,6 +428,7 @@ export async function startApi(
   options: StartApiOptions = {},
 ): Promise<RunningApi> {
   const inventory = await prepareStartupModuleInventory({
+    configuredModulesDirectory: options.configuredModulesDirectory,
     ...(options.modulesDirectoryOverride === undefined
       ? {}
       : { modulesDirectoryOverride: options.modulesDirectoryOverride }),
@@ -454,12 +454,10 @@ export async function startApi(
   const storageProvider = config.storage ? createS3StorageProvider(config.storage) : undefined;
   const mailProvider = config.mail ? createSmtpMailProvider(config.mail) : undefined;
 
-  let services: ModuleRuntimeServices;
   let runtime: ReturnType<typeof createIdentityRuntime>;
   let authorizationStore: ReturnType<typeof createAuthorizationStore>;
   let deviceStore: ReturnType<typeof createDeviceStore>;
   try {
-    services = Object.freeze({ database: databaseHandle.module });
     runtime = createIdentityRuntime({
       config: config.identity,
       db: databaseHandle.identity,
@@ -527,6 +525,15 @@ export async function startApi(
     throw error;
   }
 
+  const services: ModuleRuntimeServicesLookup = new Map<string, AnyModuleRuntimeServices>(
+    eligibility.eligibleModules.map((module) => [
+      module.manifest.id,
+      module.manifest.database?.abi === 1
+        ? Object.freeze({ database: databaseHandle.moduleExecutor(module.manifest.id) })
+        : Object.freeze({ database: databaseHandle.module }),
+    ]),
+  );
+
   // One scoped facade per eligible module, over the exact buckets that module's own manifest
   // declares. Built from the eligible set so a blocked module never receives storage at all.
   const moduleStorages = createModuleStorageLookup(
@@ -769,6 +776,7 @@ export function readConfigFromEnvironment(processEnvironment: HostEnvironment):
   readonly input: Parameters<typeof createApiRuntimeConfig>[0];
   readonly environment: "development" | "production";
   readonly moduleSecrets: ModuleSecretSource;
+  readonly modulesDirectory: string | undefined;
 } {
   const host = loadHostConfiguration(processEnvironment);
   return {
@@ -784,13 +792,19 @@ export function readConfigFromEnvironment(processEnvironment: HostEnvironment):
       storage: host.storage,
     },
     moduleSecrets: host.moduleSecrets,
+    modulesDirectory: host.modulesDirectory,
   };
 }
 
 export async function main(): Promise<void> {
-  const { environment, input, moduleSecrets } = readConfigFromEnvironment(process.env);
+  const { environment, input, moduleSecrets, modulesDirectory } = readConfigFromEnvironment(
+    process.env,
+  );
   const config = createApiRuntimeConfig(input, { environment });
-  const running = await startApi(config, { moduleSecrets });
+  const running = await startApi(config, {
+    configuredModulesDirectory: modulesDirectory,
+    moduleSecrets,
+  });
 
   const address = running.server.address();
   const boundPort = address && typeof address === "object" ? address.port : config.port;

apps/api/tests/api-http.integration.ts

@@ -221,9 +221,9 @@ async function applyCoreMigrations(url: string): Promise<void> {
     const aggregate = await discoverAllMigrations({
       coreMigrationsDirectory,
       moduleDiscovery: {
-        moduleSdkVersion: "0.1.0",
+        moduleSdkVersion: "0.2.0",
         modulesDirectory: emptyModulesDirectory,
-        platformVersion: "0.1.0",
+        platformVersion: "0.2.0",
       },
     });
     // Phase 4A's and Phase 4C pass 1's committed migrations must not have drifted while building
@@ -339,10 +339,10 @@ async function createGatedRouteModule(
     writeFile(
       path.join(moduleDirectory, "ekklesia.module.json"),
       JSON.stringify({
-        compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
+        compatibility: { moduleSdk: "^0.2.0", platform: "^0.2.0" },
         entrypoints: { server: "./dist/server/index.js" },
         id,
-        manifestVersion: 7,
+        manifestVersion: 8,
         name: `${id} module`,
         permissions: [{ baseline: "public", description: "Gated drain probe.", id: permissionId }],
         version: "0.1.0",
@@ -386,11 +386,11 @@ async function createFixtureModule(
 ): Promise<void> {
   const moduleDirectory = path.join(modulesDirectory, id);
   const manifest = {
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "0.1.0",
-    compatibility: { platform: "^0.1.0", moduleSdk: "^0.1.0" },
+    compatibility: { platform: "^0.2.0", moduleSdk: "^0.2.0" },
     permissions: [],
     entrypoints: { server: "./dist/server/index.js" },
     ...manifestOverrides,
@@ -521,10 +521,10 @@ async function createUiModule(
     writeFile(
       path.join(moduleDirectory, "ekklesia.module.json"),
       JSON.stringify({
-        compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
+        compatibility: { moduleSdk: "^0.2.0", platform: "^0.2.0" },
         entrypoints: { server: "./dist/server/index.js", ui: "./dist/ui/index.js" },
         id,
-        manifestVersion: 7,
+        manifestVersion: 8,
         name: `${id} module`,
         version,
       }),
@@ -2590,19 +2590,18 @@ describe.sequential("live API — installed module permission end-to-end", () =>
     });
 
     const report = await diagnoseEkklesia({
+      coreMigrationsDirectory,
       moduleDiscovery: {
-        moduleSdkVersion: "0.1.0",
+        moduleSdkVersion: "0.2.0",
         modulesDirectory,
-        platformVersion: "0.1.0",
+        platformVersion: "0.2.0",
       },
       runtimeRange: ">=0.0.0",
       runtimeVersion: process.versions.node,
     });
 
-    // Only the module-discovery and permission-composition checks are asserted here — this
+    // Only the module-discovery and permission-composition checks are asserted here; nothing else
-    // fixture's temporary directory has no `core/drizzle` sibling for migrations discovery to
+    // in the report bears on what this scenario proves.
-    // find, which is unrelated to what this scenario proves and would otherwise make the check
-    // fail for a reason that has nothing to do with permission composition.
     const moduleCheck = report.checks.find((entry) => entry.id === "modules.discovery");
     const permissionsCheck = report.checks.find((entry) => entry.id === "modules.permissions");
     expect(moduleCheck).toMatchObject({ status: "pass" });
@@ -3907,9 +3906,9 @@ describe.sequential("live API — module lifecycle governs what actually runs",
     const aggregate = await discoverAllMigrations({
       coreMigrationsDirectory,
       moduleDiscovery: {
-        moduleSdkVersion: "0.1.0",
+        moduleSdkVersion: "0.2.0",
         modulesDirectory,
-        platformVersion: "0.1.0",
+        platformVersion: "0.2.0",
       },
     });
     expect(aggregate.discoveredModules.map((module) => module.manifest.id)).toEqual(["calendar"]);

apps/api/tests/app.test.ts

@@ -1,8 +1,6 @@
 import {
   ANONYMOUS_PRINCIPAL,
   createAuthenticatedPrincipal,
-  type ModuleDatabase,
-  type ModuleRuntimeServices,
   moduleIdSchema,
   parseEkklesiaUserId,
   parsePermissionId,
@@ -20,6 +18,8 @@ import { IdentityRuntimeError } from "@ekklesia/core/identity";
 import {
   createModuleUiPublicationRegistry,
   EMPTY_MODULE_REALTIME_REGISTRY,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
   type ModuleUiPublicationRegistry,
   StagedModuleRealtimeRegistry,
 } from "@ekklesia/core/modules";
@@ -48,9 +48,9 @@ function fakeRuntime(overrides: Partial<EkklesiaIdentityRuntime> = {}): Ekklesia
   };
 }
 
-/** A small typed fake `ModuleRuntimeServices` — these tests exercise `createApiApp`'s own wiring,
+/** A small typed fake `LegacyModuleRuntimeServices` — these tests exercise `createApiApp`'s own wiring,
  * never real database behavior, so no PostgreSQL is required. */
-function fakeModuleServices(): ModuleRuntimeServices {
+function fakeModuleServices(): LegacyModuleRuntimeServices {
   const database = Object.freeze({
     delete: vi.fn(),
     execute: vi.fn(),

apps/api/tests/dashboard-host-routes.test.ts

@@ -1,9 +1,7 @@
 import { createHash } from "node:crypto";
 import {
   ANONYMOUS_PRINCIPAL,
-  type ModuleDatabase,
   type ModuleRouteHandler,
-  type ModuleRuntimeServices,
   parsePermissionId,
   type RegisteredModuleHttpRoute,
 } from "@ekklesia/contracts";
@@ -16,6 +14,8 @@ import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
 import {
   createModuleUiPublicationRegistry,
   EMPTY_MODULE_REALTIME_REGISTRY,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
 } from "@ekklesia/core/modules";
 import { describe, expect, it, vi } from "vitest";
 
@@ -74,7 +74,7 @@ function fakeStore(): AuthorizationStore {
   };
 }
 
-function fakeModuleServices(): ModuleRuntimeServices {
+function fakeModuleServices(): LegacyModuleRuntimeServices {
   return Object.freeze({ database: Object.freeze({}) as unknown as ModuleDatabase });
 }
 

apps/api/tests/dashboard-routes.test.ts

@@ -5,8 +5,6 @@ import {
   ANONYMOUS_PRINCIPAL,
   createAuthenticatedPrincipal,
   type EkklesiaPrincipal,
-  type ModuleDatabase,
-  type ModuleRuntimeServices,
   parseEkklesiaUserId,
 } from "@ekklesia/contracts";
 import {
@@ -20,6 +18,8 @@ import {
   createModuleUiPublicationRegistry,
   discoverModules,
   EMPTY_MODULE_REALTIME_REGISTRY,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
 } from "@ekklesia/core/modules";
 import type { Hono } from "hono";
 import { afterEach, describe, expect, it, vi } from "vitest";
@@ -77,7 +77,7 @@ async function createModule(modulesDirectory: string, fixture: ModuleFixture): P
         ...(fixture.withUi === false ? {} : { ui: "./dist/ui/index.js" }),
       },
       id: fixture.id,
-      manifestVersion: 7,
+      manifestVersion: 8,
       name: fixture.name,
       version: "1.0.0",
     }),
@@ -147,7 +147,7 @@ async function install(options: InstallOptions = {}): Promise<{ app: Hono }> {
     moduleRealtime: EMPTY_MODULE_REALTIME_REGISTRY,
     moduleServices: Object.freeze({
       database: Object.freeze({}) as unknown as ModuleDatabase,
-    }) as ModuleRuntimeServices,
+    }) as LegacyModuleRuntimeServices,
     moduleUi: createModuleUiPublicationRegistry(modules),
     moduleLifecycle: {
       snapshot: moduleLifecycleSnapshotFor(modules),

apps/api/tests/device-pairing.integration.ts

@@ -118,13 +118,13 @@ async function createDisplayModuleDirectory(): Promise<string> {
     writeFile(
       path.join(moduleDirectory, "ekklesia.module.json"),
       JSON.stringify({
-        compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
+        compatibility: { moduleSdk: "^0.2.0", platform: "^0.2.0" },
         entrypoints: {
           display: { artifact: "./dist/ui/display.js", permission: displayPermission },
           server: "./dist/server/index.js",
         },
         id: "announcements",
-        manifestVersion: 7,
+        manifestVersion: 8,
         name: "Announcements fixture",
         permissions: [
           {

apps/api/tests/health-routes.test.ts

@@ -1,8 +1,6 @@
 import {
   ANONYMOUS_PRINCIPAL,
-  type ModuleDatabase,
   type ModuleRouteHandler,
-  type ModuleRuntimeServices,
   parsePermissionId,
   type RegisteredModuleHttpRoute,
 } from "@ekklesia/contracts";
@@ -15,6 +13,8 @@ import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
 import {
   createModuleUiPublicationRegistry,
   EMPTY_MODULE_REALTIME_REGISTRY,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
 } from "@ekklesia/core/modules";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { createApiApp } from "../src/app.js";
@@ -56,7 +56,7 @@ function fakeStore(): AuthorizationStore {
   };
 }
 
-function fakeModuleServices(): ModuleRuntimeServices {
+function fakeModuleServices(): LegacyModuleRuntimeServices {
   return Object.freeze({ database: Object.freeze({}) as unknown as ModuleDatabase });
 }
 

apps/api/tests/host-configuration-parity.test.ts

@@ -151,6 +151,13 @@ describe("host configuration parity between startApi and Doctor", () => {
     );
   });
 
+  it("hands the API the same modules directory Doctor and the operator commands read", () => {
+    expect(readConfigFromEnvironment(environment()).modulesDirectory).toBeUndefined();
+    const env = environment({ EKKLESIA_MODULES_DIR: "/var/lib/ekklesia/modules" });
+    expect(readConfigFromEnvironment(env).modulesDirectory).toBe("/var/lib/ekklesia/modules");
+    expect(loadHostConfiguration(env).modulesDirectory).toBe("/var/lib/ekklesia/modules");
+  });
+
   it("reads only this listener's own address and port outside the shared loader", () => {
     const config = apiView(
       environment({ EKKLESIA_API_HOST: "0.0.0.0", EKKLESIA_API_PORT: "8080" }),

apps/api/tests/lifecycle.test.ts

@@ -104,11 +104,11 @@ async function createFixtureModule(
 ): Promise<void> {
   const moduleDirectory = path.join(modulesDirectory, id);
   const manifest = {
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "0.1.0",
-    compatibility: { platform: "^0.1.0", moduleSdk: "^0.1.0" },
+    compatibility: { platform: "^0.2.0", moduleSdk: "^0.2.0" },
     permissions: [],
     entrypoints: { server: "./dist/server/index.js" },
     ...manifestOverrides,
@@ -267,10 +267,10 @@ function fakeDiscoveredModule(
 ): DiscoveredModule {
   const manifest = parseModuleManifest({
     capabilities: [],
-    compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
+    compatibility: { moduleSdk: "^0.2.0", platform: "^0.2.0" },
     entrypoints: { server: "./dist/does-not-exist/index.js" },
     id,
-    manifestVersion: 7,
+    manifestVersion: 8,
     name: `${id} module`,
     permissions,
     version: "0.1.0",
@@ -1004,6 +1004,73 @@ describe("Ekklesia API module permission composition at startup", () => {
     expect(poolEnd).toHaveBeenCalledTimes(1);
   });
 
+  it("discovers installed modules from the configured modules directory (ADR 0048)", async () => {
+    const modulesDirectory = await createTemporaryModulesDirectory();
+    await createFixtureModule(modulesDirectory, "incompatible", {
+      compatibility: { moduleSdk: "^0.1.0", platform: ">=99.0.0" },
+    });
+
+    // The module that fails discovery lives only in the configured directory, so this rejection
+    // proves discovery read it rather than the repository's own `modules/`.
+    await expect(
+      startApi(validConfig(), { configuredModulesDirectory: modulesDirectory }),
+    ).rejects.toBeInstanceOf(ModuleDiscoveryError);
+    expect(poolConstructor).not.toHaveBeenCalled();
+  });
+
+  it("starts with zero modules from an empty configured modules directory", async () => {
+    const modulesDirectory = await createTemporaryModulesDirectory();
+    poolConstructor.mockImplementation(function fakePool() {
+      return { end: vi.fn().mockResolvedValue(undefined), on: vi.fn(), query: emptyQuery() };
+    });
+    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
+    mockSuccessfulServe();
+
+    const running = await startApi(validConfig(), { configuredModulesDirectory: modulesDirectory });
+
+    expect(poolConstructor).toHaveBeenCalledTimes(1);
+    await running.shutdown();
+  });
+
+  it.each([
+    ["a relative path", "relative/private-mount-5b2a", "MODULES_DIRECTORY_INVALID"],
+    ["a missing directory", "/nonexistent/private-mount-5b2a", "MODULES_DIRECTORY_UNREADABLE"],
+  ])("fails closed on %s, before any pool exists, naming no path", async (_label, configured, code) => {
+    let captured: unknown;
+    try {
+      await startApi(validConfig(), { configuredModulesDirectory: configured });
+    } catch (error) {
+      captured = error;
+    }
+
+    expect(captured).toBeInstanceOf(ModuleDiscoveryError);
+    const issues = (captured as ModuleDiscoveryError).issues;
+    expect(issues.map((issue) => issue.code)).toEqual([code]);
+    expect(JSON.stringify(issues)).not.toContain("private-mount-5b2a");
+    expect((captured as Error).message).not.toContain("private-mount-5b2a");
+    expect(poolConstructor).not.toHaveBeenCalled();
+    expect(betterAuthMock).not.toHaveBeenCalled();
+    expect(serveMock).not.toHaveBeenCalled();
+  });
+
+  it("lets the test-only override take precedence over a configured directory", async () => {
+    const modulesDirectory = await createTemporaryModulesDirectory();
+    poolConstructor.mockImplementation(function fakePool() {
+      return { end: vi.fn().mockResolvedValue(undefined), on: vi.fn(), query: emptyQuery() };
+    });
+    betterAuthMock.mockReturnValue({ api: { getSession: vi.fn() }, handler: vi.fn() });
+    mockSuccessfulServe();
+
+    // The configured value is unusable; the override wins, so it is never even resolved.
+    const running = await startApi(validConfig(), {
+      configuredModulesDirectory: "relative/never-resolved",
+      modulesDirectoryOverride: modulesDirectory,
+    });
+
+    expect(poolConstructor).toHaveBeenCalledTimes(1);
+    await running.shutdown();
+  });
+
   it("does not perform module discovery merely by importing the platform-permissions module", async () => {
     const module = await import("../src/platform-permissions.js");
 
@@ -1368,9 +1435,9 @@ describe("Ekklesia API module runtime startup and shutdown", () => {
     const recorder = createEventRecorder();
     await createWorkingFixtureModule(modulesDirectory, "calendar", recorder, { withRoute: true });
     const discovered = await (await import("@ekklesia/core/modules")).discoverModules({
-      moduleSdkVersion: "0.1.0",
+      moduleSdkVersion: "0.2.0",
       modulesDirectory,
-      platformVersion: "0.1.0",
+      platformVersion: "0.2.0",
     });
     mockPoolAndAuth();
     mockSuccessfulServe();

apps/api/tests/module-configuration-routes.test.ts

@@ -6,8 +6,6 @@ import {
   createAuthenticatedPrincipal,
   type EkklesiaPrincipal,
   type ModuleConfigurationDeclarationInput,
-  type ModuleDatabase,
-  type ModuleRuntimeServices,
   parseEkklesiaUserId,
 } from "@ekklesia/contracts";
 import {
@@ -22,10 +20,12 @@ import {
   createModuleUiPublicationRegistry,
   type DiscoveredModule,
   discoverModules,
+  type LegacyModuleRuntimeServices,
   type ModuleConfigurationRecord,
   type ModuleConfigurationStore,
   ModuleConfigurationStoreError,
   EMPTY_MODULE_REALTIME_REGISTRY,
+  type ModuleDatabase,
   resolveModuleEligibility,
 } from "@ekklesia/core/modules";
 import type { Hono } from "hono";
@@ -108,7 +108,7 @@ async function createModule(modulesDirectory: string, fixture: ModuleFixture): P
         configuration: fixture.configuration ?? [],
         entrypoints: { server: "./dist/server/index.js" },
         id: fixture.id,
-        manifestVersion: 7,
+        manifestVersion: 8,
         name: `${fixture.id} module`,
         version: "1.0.0",
       }),
@@ -213,7 +213,7 @@ async function install(options: InstallOptions = {}): Promise<Installation> {
     moduleRealtime: EMPTY_MODULE_REALTIME_REGISTRY,
     moduleServices: Object.freeze({
       database: Object.freeze({}) as unknown as ModuleDatabase,
-    }) as ModuleRuntimeServices,
+    }) as LegacyModuleRuntimeServices,
     moduleUi: createModuleUiPublicationRegistry(eligibility.eligibleModules),
     runtime,
     trustedOrigins: [trustedOrigin],

apps/api/tests/module-database.integration.ts

@@ -8,6 +8,7 @@ import {
   createPostgresMigrationDatabase,
   discoverAllMigrations,
 } from "@ekklesia/core/migrations";
+import { moduleDatabaseExecutorModuleId } from "@ekklesia/core/modules";
 import { Client, type QueryResultRow } from "pg";
 import { afterAll, describe, expect, it } from "vitest";
 import { createApiRuntimeConfig } from "../src/config.js";
@@ -211,9 +212,9 @@ async function applyCoreMigrations(url: string): Promise<void> {
     const aggregate = await discoverAllMigrations({
       coreMigrationsDirectory,
       moduleDiscovery: {
-        moduleSdkVersion: "0.1.0",
+        moduleSdkVersion: "0.2.0",
         modulesDirectory: emptyModulesDirectory,
-        platformVersion: "0.1.0",
+        platformVersion: "0.2.0",
       },
     });
     expect(aggregate.migrations.map((entry) => entry.identity)).toEqual([
@@ -240,9 +241,9 @@ async function applyMigrationsWithModule(url: string): Promise<void> {
   const aggregate = await discoverAllMigrations({
     coreMigrationsDirectory,
     moduleDiscovery: {
-      moduleSdkVersion: "0.1.0",
+      moduleSdkVersion: "0.2.0",
       modulesDirectory: fixtureModulesDirectory,
-      platformVersion: "0.1.0",
+      platformVersion: "0.2.0",
     },
   });
   // Core migrations aggregate first, exactly once each, and always before any module migration.
@@ -441,6 +442,11 @@ describe.sequential("live API — module database explicit migration ownership",
 
       const handle = createApiDatabase(database.url);
       expect(handle.module).toBeDefined();
+      const alpha = handle.moduleExecutor("alpha");
+      const beta = handle.moduleExecutor("beta");
+      expect(alpha).not.toBe(beta);
+      expect(moduleDatabaseExecutorModuleId(alpha)).toBe("alpha");
+      expect(moduleDatabaseExecutorModuleId(beta)).toBe("beta");
       await handle.close();
       expect(await tableExists(database.url)).toBe(false);
 

apps/api/tests/module-display-routes.test.ts

@@ -5,8 +5,6 @@ import {
   ANONYMOUS_PRINCIPAL,
   createAuthenticatedPrincipal,
   type EkklesiaPrincipal,
-  type ModuleDatabase,
-  type ModuleRuntimeServices,
   parseEkklesiaUserId,
 } from "@ekklesia/contracts";
 import {
@@ -21,6 +19,8 @@ import {
   type DiscoveredModule,
   discoverModules,
   EMPTY_MODULE_REALTIME_REGISTRY,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
 } from "@ekklesia/core/modules";
 import type { Hono } from "hono";
 import { afterEach, describe, expect, it, vi } from "vitest";
@@ -105,7 +105,7 @@ async function createModule(modulesDirectory: string, fixture: ModuleFixture = {
           : {}),
       },
       id,
-      manifestVersion: 7,
+      manifestVersion: 8,
       name: `${id} module`,
       permissions: fixture.display
         ? [
@@ -155,7 +155,7 @@ interface Installation {
   readonly modules: readonly DiscoveredModule[];
 }
 
-function fakeServices(): ModuleRuntimeServices {
+function fakeServices(): LegacyModuleRuntimeServices {
   return Object.freeze({ database: Object.freeze({}) as unknown as ModuleDatabase });
 }
 

apps/api/tests/module-http-routes.test.ts

@@ -1,13 +1,11 @@
 import {
   ANONYMOUS_PRINCIPAL,
   createAuthenticatedPrincipal,
-  type ModuleDatabase,
   type ModuleRouteHandler,
   type ModuleRouteHandlerContext,
-  type ModuleRuntimeServices,
   moduleRoutesOverlap,
-  parsePermissionId,
   type PermissionId,
+  parsePermissionId,
   type RegisteredModuleHttpRoute,
 } from "@ekklesia/contracts";
 import {
@@ -20,20 +18,23 @@ import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
 import {
   createModuleUiPublicationRegistry,
   EMPTY_MODULE_REALTIME_REGISTRY,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
+  type ModuleRuntimeServicesLookup,
 } from "@ekklesia/core/modules";
 import { describe, expect, it, vi } from "vitest";
-import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
-import { testDashboardHostAssets } from "./support/dashboard-host-assets.js";
-import { readyHealth } from "./support/ready-health.js";
 import { createApiApp } from "../src/app.js";
 import {
   canonicalizeVaryHeader,
-  mergedVaryHeader,
   ModuleRouteConfigurationError,
+  mergedVaryHeader,
 } from "../src/module-http-routes.js";
-import { emptyModuleLifecycle } from "./support/in-memory-module-lifecycle.js";
+import { testDashboardHostAssets } from "./support/dashboard-host-assets.js";
+import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
 import { emptyModuleConfiguration } from "./support/in-memory-module-configuration.js";
+import { emptyModuleLifecycle } from "./support/in-memory-module-lifecycle.js";
 import { emptyModuleStorage } from "./support/in-memory-module-storage.js";
+import { readyHealth } from "./support/ready-health.js";
 
 const trustedOrigin = "https://dashboard.example.test";
 const untrustedOrigin = "https://evil.example.test";
@@ -73,11 +74,11 @@ function moduleRoute(
   return Object.freeze({ bodyMode: "buffered", maxBodyBytes: 1024, ...fields });
 }
 
-/** A small typed fake `ModuleRuntimeServices` — these tests exercise route mounting,
+/** A small typed fake `LegacyModuleRuntimeServices` — these tests exercise route mounting,
  * authorization, and response sanitization, never real database behavior, so no PostgreSQL is
  * required. Each `database` method stays a distinct spy so a test can assert none of them were
  * ever called (denied, trusted-origin-rejected, and `OPTIONS` requests never reach a handler). */
-function fakeModuleServices(): ModuleRuntimeServices {
+function fakeModuleServices(): LegacyModuleRuntimeServices {
   const database = Object.freeze({
     delete: vi.fn(),
     execute: vi.fn(),
@@ -91,7 +92,7 @@ function fakeModuleServices(): ModuleRuntimeServices {
   return Object.freeze({ database });
 }
 
-function expectDatabaseFakeUntouched(services: ModuleRuntimeServices): void {
+function expectDatabaseFakeUntouched(services: LegacyModuleRuntimeServices): void {
   expect(vi.mocked(services.database.select)).not.toHaveBeenCalled();
   expect(vi.mocked(services.database.selectDistinct)).not.toHaveBeenCalled();
   expect(vi.mocked(services.database.selectDistinctOn)).not.toHaveBeenCalled();
@@ -107,7 +108,7 @@ function buildModuleApp(options: {
   readonly registry: PermissionRegistry;
   readonly routes: readonly RegisteredModuleHttpRoute[];
   readonly runtime?: EkklesiaIdentityRuntime;
-  readonly services?: ModuleRuntimeServices;
+  readonly services?: LegacyModuleRuntimeServices | ModuleRuntimeServicesLookup;
   readonly trustedOrigins?: readonly string[];
 }) {
   const evaluator = options.evaluator ?? {
@@ -145,6 +146,36 @@ function permissionRegistry(
 }
 
 describe("module HTTP route mounting", () => {
+  it("selects the owning module's stable service entry for its handler", async () => {
+    const calendar = fakeModuleServices();
+    const people = fakeModuleServices();
+    const services: ModuleRuntimeServicesLookup = new Map([
+      ["calendar", calendar],
+      ["people", people],
+    ]);
+    let received: unknown;
+    const { app } = buildModuleApp({
+      registry: permissionRegistry([{ id: readPermission, baseline: "public" }]),
+      routes: [
+        moduleRoute({
+          handler: (_request, context) => {
+            received = context.services;
+            return Response.json({ ok: true });
+          },
+          method: "GET",
+          moduleId: "calendar",
+          path: "/services",
+          permission: readPermission,
+        }),
+      ],
+      services,
+    });
+
+    expect((await app.request("/api/v1/modules/calendar/services")).status).toBe(200);
+    expect(received).toBe(calendar);
+    expect(received).not.toBe(people);
+  });
+
   it('mounts a "/" route at exactly the module root, never with an added trailing slash', async () => {
     const handler = vi.fn<ModuleRouteHandler>(async () => new Response("root", { status: 200 }));
     const { app } = buildModuleApp({
@@ -508,7 +539,7 @@ describe("module route authorization", () => {
     expect(response.status).toBe(403);
     expect(await response.json()).toEqual({ code: "AUTHORIZATION_DENIED" });
     expect(handler).not.toHaveBeenCalled();
-    expectDatabaseFakeUntouched(services);
+    expectDatabaseFakeUntouched(services as LegacyModuleRuntimeServices);
   });
 
   it("does not invoke the handler when principal resolution fails", async () => {
@@ -637,7 +668,7 @@ describe("module route trusted-origin enforcement", () => {
     }
     expect(handler).not.toHaveBeenCalled();
     expect(evaluator.authorize).not.toHaveBeenCalled();
-    expectDatabaseFakeUntouched(services);
+    expectDatabaseFakeUntouched(services as LegacyModuleRuntimeServices);
   });
 
   it("allows a trusted-origin state-changing request through to the handler", async () => {
@@ -766,7 +797,7 @@ describe("module route CORS", () => {
 
     expect(handler).not.toHaveBeenCalled();
     expect(evaluator.authorize).not.toHaveBeenCalled();
-    expectDatabaseFakeUntouched(services);
+    expectDatabaseFakeUntouched(services as LegacyModuleRuntimeServices);
   });
 
   it("never reflects an untrusted origin for a module route", async () => {

apps/api/tests/module-lifecycle-routes.test.ts

@@ -5,8 +5,6 @@ import {
   ANONYMOUS_PRINCIPAL,
   createAuthenticatedPrincipal,
   type EkklesiaPrincipal,
-  type ModuleDatabase,
-  type ModuleRuntimeServices,
   parseEkklesiaUserId,
 } from "@ekklesia/contracts";
 import {
@@ -20,6 +18,8 @@ import {
   createModuleUiPublicationRegistry,
   type DiscoveredModule,
   discoverModules,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
   type ModuleLifecycleStore,
   ModuleLifecycleStoreError,
   EMPTY_MODULE_REALTIME_REGISTRY,
@@ -79,7 +79,7 @@ async function createModule(modulesDirectory: string, fixture: ModuleFixture): P
         ...(fixture.dependencies ? { dependencies: fixture.dependencies } : {}),
         entrypoints: { server: "./dist/server/index.js", ui: "./dist/ui/index.js" },
         id: fixture.id,
-        manifestVersion: 7,
+        manifestVersion: 8,
         name: `${fixture.id} module`,
         version: "1.0.0",
       }),
@@ -189,7 +189,7 @@ async function install(options: InstallOptions = {}): Promise<Installation> {
     moduleRealtime: EMPTY_MODULE_REALTIME_REGISTRY,
     moduleServices: Object.freeze({
       database: Object.freeze({}) as unknown as ModuleDatabase,
-    }) as ModuleRuntimeServices,
+    }) as LegacyModuleRuntimeServices,
     moduleUi: createModuleUiPublicationRegistry(eligibility.eligibleModules),
     runtime,
     trustedOrigins: [trustedOrigin],

apps/api/tests/module-realtime-live.test.ts

@@ -4,9 +4,7 @@ import path from "node:path";
 import {
   ANONYMOUS_PRINCIPAL,
   createAuthenticatedPrincipal,
-  type ModuleDatabase,
   type ModuleRealtimePublisher,
-  type ModuleRuntimeServices,
   parseEkklesiaUserId,
 } from "@ekklesia/contracts";
 import {
@@ -18,6 +16,8 @@ import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
 import {
   composePlatformPermissionRegistry,
   discoverModules,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
   type ModuleRealtimeRegistry,
   type ModuleRealtimeSubscription,
   startDiscoveredModuleRuntime,
@@ -188,7 +188,7 @@ async function createFixtureModule(control: FixtureControl): Promise<{
         compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
         entrypoints: { server: "./dist/server/index.js" },
         id: "announcements",
-        manifestVersion: 7,
+        manifestVersion: 8,
         name: "Announcements fixture",
         permissions: [
           {
@@ -226,7 +226,7 @@ async function createFixtureModule(control: FixtureControl): Promise<{
   return { directory, symbol };
 }
 
-function services(): ModuleRuntimeServices {
+function services(): LegacyModuleRuntimeServices {
   return Object.freeze({ database: Object.freeze({}) as ModuleDatabase });
 }
 

apps/api/tests/module-ui-host-e2e.test.ts

@@ -5,8 +5,6 @@ import {
   ANONYMOUS_PRINCIPAL,
   createAuthenticatedPrincipal,
   type EkklesiaPrincipal,
-  type ModuleDatabase,
-  type ModuleRuntimeServices,
   parseEkklesiaUserId,
 } from "@ekklesia/contracts";
 import {
@@ -18,6 +16,8 @@ import {
   composePlatformPermissionRegistry,
   createModuleUiPublicationRegistry,
   discoverModules,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
   startDiscoveredModuleRuntime,
 } from "@ekklesia/core/modules";
 import {
@@ -129,7 +129,7 @@ async function createFixtureModule(
           : {}),
       },
       id,
-      manifestVersion: 7,
+      manifestVersion: 8,
       name,
       permissions: [
         {
@@ -241,7 +241,7 @@ async function startHarness(options: HarnessOptions = {}): Promise<Harness> {
     modulesDirectory,
     platformVersion: "0.1.0",
   });
-  const services: ModuleRuntimeServices = Object.freeze({
+  const services: LegacyModuleRuntimeServices = Object.freeze({
     database: Object.freeze({}) as unknown as ModuleDatabase,
   });
   // The module's real runtime: its server entrypoint is imported, registered, and started, and the

apps/api/tests/module-ui-inventory.test.ts

@@ -5,8 +5,6 @@ import {
   ANONYMOUS_PRINCIPAL,
   createAuthenticatedPrincipal,
   type EkklesiaPrincipal,
-  type ModuleDatabase,
-  type ModuleRuntimeServices,
   parseEkklesiaUserId,
 } from "@ekklesia/contracts";
 import {
@@ -21,6 +19,8 @@ import {
   type DiscoveredModule,
   discoverModules,
   EMPTY_MODULE_REALTIME_REGISTRY,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
 } from "@ekklesia/core/modules";
 import type { Hono } from "hono";
 import { afterEach, describe, expect, it, vi } from "vitest";
@@ -99,7 +99,7 @@ async function createModule(modulesDirectory: string, fixture: ModuleFixture): P
         version: "1.0.0",
       })),
       id: fixture.id,
-      manifestVersion: 7,
+      manifestVersion: 8,
       name: `${fixture.id} module`,
       permissions: (fixture.permissions ?? []).map((permission) => ({
         ...permission,
@@ -192,7 +192,7 @@ async function install(options: InstallOptions): Promise<Installation> {
     revokeGrant: vi.fn(),
     revokePlatformOwner: vi.fn(),
   } as unknown as AuthorizationStore;
-  const services: ModuleRuntimeServices = Object.freeze({
+  const services: LegacyModuleRuntimeServices = Object.freeze({
     database: Object.freeze({}) as unknown as ModuleDatabase,
   });
   const permissionRegistry = composePlatformPermissionRegistry(modules);

apps/api/tests/module-ui-routes.test.ts

@@ -1,11 +1,7 @@
 import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import path from "node:path";
-import {
+import { ANONYMOUS_PRINCIPAL } from "@ekklesia/contracts";
-  ANONYMOUS_PRINCIPAL,
-  type ModuleDatabase,
-  type ModuleRuntimeServices,
-} from "@ekklesia/contracts";
 import type { AuthorizationEvaluator, AuthorizationStore } from "@ekklesia/core/authorization";
 import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
 import {
@@ -14,6 +10,8 @@ import {
   type DiscoveredModule,
   discoverModules,
   EMPTY_MODULE_REALTIME_REGISTRY,
+  type LegacyModuleRuntimeServices,
+  type ModuleDatabase,
 } from "@ekklesia/core/modules";
 import { loadModuleUi } from "@ekklesia/module-ui-host";
 import { MODULE_UI_ABI_VERSION, NO_MODULE_UI_CONTRIBUTIONS } from "@ekklesia/module-ui-sdk";
@@ -139,7 +137,7 @@ async function createModule(modulesDirectory: string, fixture: ModuleFixture): P
         version: "1.0.0",
       })),
       id: fixture.id,
-      manifestVersion: 7,
+      manifestVersion: 8,
       name: `${fixture.id} module`,
       permissions:
         fixture.display === undefined
@@ -215,7 +213,7 @@ async function install(
       : modules.filter((module) => publicationModuleIds.includes(module.manifest.id));
 
   const database = Object.freeze({}) as unknown as ModuleDatabase;
-  const services: ModuleRuntimeServices = Object.freeze({ database });
+  const services: LegacyModuleRuntimeServices = Object.freeze({ database });
   const runtime: EkklesiaIdentityRuntime = {
     handleAuthRequest: vi.fn().mockResolvedValue(new Response(null, { status: 200 })),
     // Anonymous, and every authorization decision denied: whatever this route does, it does it

core/package.json

@@ -1,6 +1,7 @@
 {
   "name": "@ekklesia/core",
-  "version": "0.1.2",
+  "version": "0.2.4",
+  "license": "AGPL-3.0-or-later",
   "private": true,
   "type": "module",
   "files": [

core/src/cli/doctor.ts

@@ -8,6 +8,7 @@ import {
   formatDoctorReport,
 } from "../diagnostics/index.js";
 import { type HostEnvironment, loadHostConfiguration } from "../host/index.js";
+import { type ModulesDirectorySelection, resolveModulesDirectory } from "../modules/index.js";
 
 interface ModuleSdkPackageDocument {
   readonly version?: unknown;
@@ -25,8 +26,10 @@ interface RootPackageDocument extends ModuleSdkPackageDocument {
  */
 export interface DoctorCommandMetadata {
   readonly moduleSdkVersion: string;
-  readonly modulesDirectory: string;
   readonly platformVersion: string;
+  /** Where the platform is installed: Core's migrations live beneath it, and so does the
+   * development default modules directory. Installed modules may live anywhere else. */
+  readonly repositoryRoot: string;
   readonly runtimeRange: string;
   readonly runtimeVersion: string;
 }
@@ -49,6 +52,22 @@ function requiredString(value: unknown): string {
   return value;
 }
 
+/**
+ * The modules directory exactly as `startApi` would choose it. An unusable configured value is not
+ * thrown here, because Doctor must still produce a report: it is handed on as a required directory
+ * for discovery to refuse, which reports it as a sanitized module-discovery failure.
+ */
+function doctorModulesDirectory(
+  configured: string | undefined,
+  repositoryRoot: string,
+): ModulesDirectorySelection {
+  try {
+    return resolveModulesDirectory({ configured, repositoryRoot });
+  } catch {
+    return { modulesDirectory: configured ?? "", modulesDirectoryRequired: true };
+  }
+}
+
 /**
  * Turns one deployment environment into Doctor's inputs.
  *
@@ -69,6 +88,7 @@ export function createDoctorOptions(
   const host = loadHostConfiguration(environment);
   return {
     clientAddress: host.clientAddress,
+    coreMigrationsDirectory: path.join(metadata.repositoryRoot, "core", "drizzle"),
     databaseEnvironment: host.environment,
     databaseTransport: host.databaseTransport,
     databaseUrl: host.databaseUrl,
@@ -76,7 +96,7 @@ export function createDoctorOptions(
     mailConfiguration: host.mail,
     moduleDiscovery: {
       moduleSdkVersion: metadata.moduleSdkVersion,
-      modulesDirectory: metadata.modulesDirectory,
+      ...doctorModulesDirectory(host.modulesDirectory, metadata.repositoryRoot),
       platformVersion: metadata.platformVersion,
     },
     moduleSecrets: host.moduleSecrets,
@@ -97,8 +117,8 @@ export async function runDoctorCommand(repositoryRoot = process.cwd()): Promise<
   const report = await diagnoseEkklesia(
     createDoctorOptions(process.env, {
       moduleSdkVersion: requiredString(moduleSdkPackage.version),
-      modulesDirectory: path.join(repositoryRoot, "modules"),
       platformVersion: requiredString(rootPackage.version),
+      repositoryRoot,
       runtimeRange: requiredString(rootPackage.engines?.node),
       runtimeVersion: process.versions.node,
     }),

core/src/cli/migration-command-support.ts

@@ -1,7 +1,9 @@
 import { readFile } from "node:fs/promises";
 import path from "node:path";
+import type { HostEnvironment } from "../host/index.js";
 import { discoverAllMigrations } from "../migrations/index.js";
 import type { ModuleMigrationAggregate } from "../modules/index.js";
+import { resolveCommandModulesDirectory } from "./modules-directory-environment.js";
 
 interface PackageVersion {
   readonly version?: unknown;
@@ -15,9 +17,16 @@ async function readPackageVersion(packagePath: string): Promise<string> {
   return packageData.version;
 }
 
+/**
+ * Core's migrations come from the platform (`<repositoryRoot>/core/drizzle`); installed modules'
+ * come from the configured modules directory, wherever it is (ADR 0048). Neither is ever derived
+ * from the other.
+ */
 export async function discoverRepositoryMigrations(
   repositoryRoot = process.cwd(),
+  environment: HostEnvironment = process.env,
 ): Promise<ModuleMigrationAggregate> {
+  const modulesDirectory = resolveCommandModulesDirectory(environment, repositoryRoot);
   const [platformVersion, moduleSdkVersion] = await Promise.all([
     readPackageVersion(path.join(repositoryRoot, "package.json")),
     readPackageVersion(path.join(repositoryRoot, "packages/module-sdk/package.json")),
@@ -27,7 +36,7 @@ export async function discoverRepositoryMigrations(
     coreMigrationsDirectory: path.join(repositoryRoot, "core", "drizzle"),
     moduleDiscovery: {
       moduleSdkVersion,
-      modulesDirectory: path.join(repositoryRoot, "modules"),
+      ...modulesDirectory,
       platformVersion,
     },
   });

core/src/cli/migration-report.ts

@@ -1,5 +1,9 @@
 import type { ModuleMigrationAggregate } from "../modules/index.js";
-import type { MigrationApplyResult, MigrationPlanResult } from "../migrations/index.js";
+import type {
+  MigrationApplyResult,
+  MigrationPlanResult,
+  RetainedMigrationHistory,
+} from "../migrations/index.js";
 
 function plural(count: number, singular: string): string {
   return count === 1 ? singular : `${singular}s`;
@@ -28,10 +32,19 @@ export function formatMigrationValidationReport(
   return Object.freeze(lines);
 }
 
+/** An absent module's applied history (ADR 0048): kept, reported, and never a reason to stop. */
+function retainedLines(retained: readonly RetainedMigrationHistory[]): readonly string[] {
+  return retained.map(
+    (module) =>
+      `- [retained] ${module.moduleId}: ${module.appliedCount} applied ${plural(module.appliedCount, "migration")} kept; the module is not installed`,
+  );
+}
+
 export function formatMigrationPlanReport(plan: MigrationPlanResult): readonly string[] {
   const readyCount = plan.pendingCount - plan.approvalRequiredCount;
+  const retainedSummary = plan.retained.length === 0 ? "" : `, ${plan.retained.length} retained`;
   const lines = [
-    `Migration plan (${plan.appliedCount} applied, ${readyCount} pending, ${plan.approvalRequiredCount} approval-blocked):`,
+    `Migration plan (${plan.appliedCount} applied, ${readyCount} pending, ${plan.approvalRequiredCount} approval-blocked${retainedSummary}):`,
   ];
 
   for (const entry of plan.entries) {
@@ -40,6 +53,7 @@ export function formatMigrationPlanReport(plan: MigrationPlanResult): readonly s
   if (plan.entries.length === 0) {
     lines.push("- No installed module migrations.");
   }
+  lines.push(...retainedLines(plan.retained));
   lines.push(
     "Informational only: this plan is read-only and may become stale; apply revalidates history under the migration lock.",
   );
@@ -49,7 +63,10 @@ export function formatMigrationPlanReport(plan: MigrationPlanResult): readonly s
 
 export function formatMigrationApplyReport(result: MigrationApplyResult): readonly string[] {
   if (result.noOp) {
-    return Object.freeze(["Migration apply completed: database is already current (no changes)."]);
+    return Object.freeze([
+      "Migration apply completed: database is already current (no changes).",
+      ...retainedLines(result.retained),
+    ]);
   }
 
   const lines = [
@@ -58,5 +75,6 @@ export function formatMigrationApplyReport(result: MigrationApplyResult): readon
   for (const migration of result.applied) {
     lines.push(`- ${migration.identity} sha256=${migration.checksum}`);
   }
+  lines.push(...retainedLines(result.retained));
   return Object.freeze(lines);
 }

core/src/cli/modules-directory-environment.ts

@@ -0,0 +1,17 @@
+import { type HostEnvironment, loadHostConfiguration } from "../host/index.js";
+import { type ModulesDirectorySelection, resolveModulesDirectory } from "../modules/index.js";
+
+/**
+ * The modules directory an operator command discovers, read through the same host configuration
+ * `startApi` and Doctor use and resolved by the one Core resolver (ADR 0048). Throws the resolver's
+ * sanitized `ModuleDiscoveryError` for an unusable value, which every command already reports.
+ */
+export function resolveCommandModulesDirectory(
+  environment: HostEnvironment,
+  repositoryRoot: string,
+): ModulesDirectorySelection {
+  return resolveModulesDirectory({
+    configured: loadHostConfiguration(environment).modulesDirectory,
+    repositoryRoot,
+  });
+}

core/src/cli/set-module-enabled.ts

@@ -12,6 +12,7 @@ import {
   resolveModuleEligibility,
 } from "../modules/index.js";
 import { resolveExecutableDatabaseTransport } from "./database-transport-environment.js";
+import { resolveCommandModulesDirectory } from "./modules-directory-environment.js";
 
 /**
  * Enables or disables one installed module, out of band from the running API.
@@ -99,7 +100,7 @@ async function main(): Promise<void> {
   // configurable here, which is the case this command exists for.
   const discovered = await discoverModules({
     moduleSdkVersion,
-    modulesDirectory: path.join(repositoryRoot, "modules"),
+    ...resolveCommandModulesDirectory(process.env, repositoryRoot),
     platformVersion,
   });
   if (!discovered.some((module) => module.manifest.id === moduleId)) {

core/src/cli/validate-modules.ts

@@ -9,6 +9,7 @@ import {
   ModulePermissionCompositionError,
   ModuleSchemaDiscoveryError,
 } from "../modules/index.js";
+import { resolveCommandModulesDirectory } from "./modules-directory-environment.js";
 
 interface PackageVersion {
   version?: unknown;
@@ -30,7 +31,7 @@ async function main(): Promise<void> {
   ]);
   const schemaAggregate = await discoverModuleSchemas({
     moduleSdkVersion,
-    modulesDirectory: path.join(repositoryRoot, "modules"),
+    ...resolveCommandModulesDirectory(process.env, repositoryRoot),
     platformVersion,
   });
   const modules = schemaAggregate.discoveredModules;

core/src/cli/verify-module-package.ts

@@ -0,0 +1,188 @@
+import { readFile } from "node:fs/promises";
+import path from "node:path";
+import { pathToFileURL } from "node:url";
+import {
+  type ModulePackagePlatform,
+  ModulePackageVerificationError,
+  verifyModulePackage,
+} from "../modules/index.js";
+
+/**
+ * `verify-module-package` — verifies an Ekklesia Module Package v1 archive against this platform
+ * (ADR 0049), and never installs it.
+ *
+ *   node core/dist/cli/verify-module-package.js <archive>
+ *     [--sha256 <hex> | --sha256-file <file>]   the archive's expected SHA-256
+ *     [--extract-to <new directory>]            write the verified module directory there
+ *
+ * Run from the platform's root (`/opt/ekklesia` in the image), like every operator command: the
+ * platform's own versions are read from there. `--extract-to` writes only after every check passed,
+ * into a directory that must not exist yet; it is the staging step of an installation, not the
+ * installation itself.
+ */
+
+class VerifyArgumentsError extends Error {}
+
+const USAGE =
+  "Usage: verify-module-package <archive> [--sha256 <hex> | --sha256-file <file>] [--extract-to <new directory>]";
+export const MODULE_VERIFIER_SCRATCH_ENV = "EKKLESIA_MODULE_VERIFIER_SCRATCH_DIR";
+
+export interface VerifyModulePackageArguments {
+  readonly archivePath: string;
+  readonly expectedSha256?: string;
+  readonly sha256File?: string;
+  readonly extractTo?: string;
+}
+
+function normalizedDigest(value: string): string {
+  const digest = value.trim().toLowerCase();
+  if (!/^[0-9a-f]{64}$/u.test(digest)) {
+    throw new VerifyArgumentsError("The SHA-256 must be 64 hexadecimal characters.");
+  }
+  return digest;
+}
+
+export function parseVerifyModulePackageArguments(
+  argv: readonly string[],
+): VerifyModulePackageArguments {
+  const positional: string[] = [];
+  const options = new Map<string, string>();
+  for (let index = 0; index < argv.length; index += 1) {
+    const argument = argv[index] ?? "";
+    if (argument.startsWith("--")) {
+      if (!["--sha256", "--sha256-file", "--extract-to"].includes(argument)) {
+        throw new VerifyArgumentsError(USAGE);
+      }
+      const value = argv[index + 1];
+      if (value === undefined || value.startsWith("--") || options.has(argument)) {
+        throw new VerifyArgumentsError(USAGE);
+      }
+      options.set(argument, value);
+      index += 1;
+    } else {
+      positional.push(argument);
+    }
+  }
+  const archivePath = positional[0];
+  if (positional.length !== 1 || archivePath === undefined || archivePath === "") {
+    throw new VerifyArgumentsError(USAGE);
+  }
+  if (options.has("--sha256") && options.has("--sha256-file")) {
+    throw new VerifyArgumentsError(USAGE);
+  }
+  const sha256 = options.get("--sha256");
+  const sha256File = options.get("--sha256-file");
+  const extractTo = options.get("--extract-to");
+  return {
+    archivePath,
+    ...(sha256 === undefined ? {} : { expectedSha256: normalizedDigest(sha256) }),
+    ...(sha256File === undefined ? {} : { sha256File }),
+    ...(extractTo === undefined ? {} : { extractTo }),
+  };
+}
+
+/** The `sha256sum` format: one line, the digest, whitespace, and a file name that is never trusted. */
+export function parseSha256File(contents: string): string {
+  const lines = contents.split("\n").filter((line) => line.trim() !== "");
+  const match = lines.length === 1 ? /^([0-9a-fA-F]{64})\s+\*?\S/u.exec(lines[0] ?? "") : null;
+  if (!match?.[1]) {
+    throw new VerifyArgumentsError("The SHA-256 file must hold one sha256sum line.");
+  }
+  return match[1].toLowerCase();
+}
+
+/** The CLI's operator-facing bridge to Core's otherwise explicit verifier option. */
+export function moduleVerifierScratchDirectory(environment: NodeJS.ProcessEnv): string | undefined {
+  const configured = environment[MODULE_VERIFIER_SCRATCH_ENV];
+  if (configured === undefined) return undefined;
+  if (configured === "" || !path.isAbsolute(configured)) {
+    throw new VerifyArgumentsError(`${MODULE_VERIFIER_SCRATCH_ENV} must be an absolute path.`);
+  }
+  return configured;
+}
+
+async function readJson(file: string): Promise<Record<string, unknown>> {
+  return JSON.parse(await readFile(file, "utf8")) as Record<string, unknown>;
+}
+
+function requiredString(value: unknown): string {
+  if (typeof value !== "string" || value === "") {
+    throw new VerifyArgumentsError("The platform's own package metadata could not be read.");
+  }
+  return value;
+}
+
+/** What this platform is, read from where it is installed. The transitional database runtime is
+ * the Drizzle version Core itself depends on (ADR 0049). */
+export async function readModulePackagePlatform(
+  repositoryRoot: string,
+): Promise<ModulePackagePlatform> {
+  const [root, sdk, core] = await Promise.all([
+    readJson(path.join(repositoryRoot, "package.json")),
+    readJson(path.join(repositoryRoot, "packages", "module-sdk", "package.json")),
+    readJson(path.join(repositoryRoot, "core", "package.json")),
+  ]);
+  const dependencies = core.dependencies as Record<string, unknown> | undefined;
+  return {
+    databaseRuntime: { "drizzle-orm": requiredString(dependencies?.["drizzle-orm"]) },
+    moduleSdkVersion: requiredString(sdk.version),
+    platformVersion: requiredString(root.version),
+  };
+}
+
+async function main(): Promise<void> {
+  const parsed = parseVerifyModulePackageArguments(process.argv.slice(2));
+  const executionScratchDirectory = moduleVerifierScratchDirectory(process.env);
+  let expectedSha256 = parsed.expectedSha256;
+  if (parsed.sha256File !== undefined) {
+    let contents: string;
+    try {
+      contents = await readFile(parsed.sha256File, "utf8");
+    } catch {
+      throw new VerifyArgumentsError("The SHA-256 file could not be read.");
+    }
+    expectedSha256 = parseSha256File(contents);
+  }
+  const platform = await readModulePackagePlatform(process.cwd()).catch(() => {
+    throw new VerifyArgumentsError("The platform's own package metadata could not be read.");
+  });
+  const result = await verifyModulePackage({
+    archivePath: parsed.archivePath,
+    platform,
+    ...(executionScratchDirectory === undefined ? {} : { executionScratchDirectory }),
+    ...(expectedSha256 === undefined ? {} : { expectedSha256 }),
+    ...(parsed.extractTo === undefined ? {} : { extractTo: parsed.extractTo }),
+  });
+  console.log(
+    `Module package verified: ${result.moduleId}@${result.version} (target ${result.target}), ${result.fileCount} files, sha256 ${result.archiveSha256}.`,
+  );
+  if (expectedSha256 === undefined) {
+    console.log("The archive's SHA-256 was not checked: no expected digest was given.");
+  }
+  if (parsed.extractTo !== undefined) {
+    console.log("The verified module directory was extracted. Nothing was installed.");
+  }
+}
+
+function isDirectExecution(): boolean {
+  const entrypoint = process.argv[1];
+  return (
+    entrypoint !== undefined && import.meta.url === pathToFileURL(path.resolve(entrypoint)).href
+  );
+}
+
+if (isDirectExecution()) {
+  main().catch((error: unknown) => {
+    if (error instanceof ModulePackageVerificationError) {
+      console.error(`[${error.code}] ${error.message}`);
+      if (error.issueCodes.length > 0) {
+        console.error(`Module validation issues: ${error.issueCodes.join(", ")}`);
+      }
+    } else if (error instanceof VerifyArgumentsError) {
+      console.error(error.message);
+    } else {
+      console.error("Module package verification failed unexpectedly.");
+    }
+    process.exitCode = 1;
+  });
+}

core/src/diagnostics/doctor.ts

@@ -1,4 +1,3 @@
-import path from "node:path";
 import {
   capabilityIdSchema,
   EMPTY_MODULE_SECRET_SOURCE,
@@ -43,6 +42,7 @@ import {
 } from "../mail/index.js";
 import {
   createPostgresMigrationDatabase,
+  type DiscoverAllMigrationsOptions,
   discoverAllMigrations,
   type MigrationDatabase,
   type MigrationPlanResult,
@@ -64,6 +64,7 @@ import {
   isConfigurationBlockedDetail,
   isStorageBlockedDetail,
   type ModuleConfigurationSettings,
+  ModuleDiscoveryError,
   type ModuleDiscoveryOptions,
   type ModuleEligibility,
   type ModuleLifecycleConfiguration,
@@ -126,6 +127,9 @@ export interface DoctorIdentityConfigurationOptions {
 
 export interface DoctorOptions {
   readonly clientAddress?: ClientAddressConfigInput | undefined;
+  /** Core's own migrations, where the platform is installed. Never derived from the modules
+   * directory: installed modules live in installation-owned storage, anywhere at all (ADR 0048). */
+  readonly coreMigrationsDirectory: string;
   /** The environment the executable resolved, used only for transport policy evaluation; identity
    * configuration keeps its own `identityConfiguration.environment` for the same purpose. */
   readonly databaseEnvironment?: DatabaseTransportEnvironment | undefined;
@@ -170,7 +174,7 @@ export interface DoctorDependencies {
     options: PostgresMigrationDatabaseOptions,
   ) => MigrationDatabase;
   readonly discoverMigrations: (
-    options: ModuleDiscoveryOptions,
+    options: DiscoverAllMigrationsOptions,
   ) => Promise<ModuleMigrationAggregate>;
   readonly discoverModules: (
     options: ModuleDiscoveryOptions,
@@ -207,15 +211,6 @@ const checksumPattern = /^[a-f0-9]{64}$/u;
 const migrationIdentityPattern =
   /^[a-z][a-z0-9]*(?:-[a-z0-9]+)*:\d{4,}_[a-z][a-z0-9]*(?:_[a-z0-9]+)*$/u;
 
-async function discoverAllMigrationsForRuntime(
-  options: ModuleDiscoveryOptions,
-): Promise<ModuleMigrationAggregate> {
-  return discoverAllMigrations({
-    coreMigrationsDirectory: path.join(path.dirname(options.modulesDirectory), "core", "drizzle"),
-    moduleDiscovery: options,
-  });
-}
-
 /** Opens its own short-lived connection, reads, and always closes it — Doctor never leaves a pool
  * behind, and never shares one with the migration planner's, whose lifetime it does not control. */
 async function readModuleLifecycleForRuntime(
@@ -273,7 +268,7 @@ async function probeMailForRuntime(config: MailProviderConfig): Promise<void> {
 const productionDependencies: DoctorDependencies = Object.freeze({
   composePermissions: composePlatformPermissionRegistry,
   createMigrationDatabase: createPostgresMigrationDatabase,
-  discoverMigrations: discoverAllMigrationsForRuntime,
+  discoverMigrations: discoverAllMigrations,
   discoverModules,
   discoverSchemas: discoverModuleSchemas,
   planMigrations: planModuleMigrations,
@@ -633,11 +628,23 @@ function storageBindingsCheck(
     details,
   );
 }
+function moduleDiscoveryFailureDetail(error: unknown): string {
+  if (!(error instanceof ModuleDiscoveryError)) {
+    return "Static module discovery could not be completed.";
+  }
+  // The modules directory itself, rather than anything in it (ADR 0048). Fixed wording, never the
+  // configured value: a path is machine detail.
+  if (error.issues.some((issue) => issue.code === "MODULES_DIRECTORY_INVALID")) {
+    return "The configured modules directory is not usable.";
+  }
+  if (error.issues.some((issue) => issue.code === "MODULES_DIRECTORY_UNREADABLE")) {
+    return "The configured modules directory could not be read.";
+  }
+  return "The installed module inventory is invalid.";
+}
+
 function moduleDiscoveryFailure(error: unknown): DoctorCheck {
-  const details =
+  const details = [moduleDiscoveryFailureDetail(error)];
-    error instanceof Error && error.name === "ModuleDiscoveryError"
-      ? ["The installed module inventory is invalid."]
-      : ["Static module discovery could not be completed."];
   return freezeCheck("modules.discovery", "failure", "Module discovery failed", details);
 }
 
@@ -733,6 +740,14 @@ function migrationPlanCheck(plan: MigrationPlanResult): DoctorCheck {
       }
       return `${entry.status} · ${safeMigrationReference(entry.identity, entry.checksum)}`;
     }),
+    // An absent module's applied history (ADR 0048) is information, never attention: removing a
+    // module's code keeps its data, and nothing here is pending.
+    ...plan.retained.map((module) => {
+      if (!/^[a-z][a-z0-9]*(?:-[a-z0-9]+)*$/u.test(module.moduleId)) {
+        throw new TypeError("Unsafe migration plan diagnostic value.");
+      }
+      return `retained · ${module.moduleId} · ${module.appliedCount} applied ${plural(module.appliedCount, "migration")} kept; the module is not installed`;
+    }),
   ];
 
   if (pendingCount + blockedCount === 0) {
@@ -1132,7 +1147,10 @@ export async function diagnoseEkklesia(
     }
 
     try {
-      migrations = await dependencies.discoverMigrations(options.moduleDiscovery);
+      migrations = await dependencies.discoverMigrations({
+        coreMigrationsDirectory: options.coreMigrationsDirectory,
+        moduleDiscovery: options.moduleDiscovery,
+      });
       const inventory = migrations.migrations.map((migration) =>
         safeMigrationReference(migration.identity, migration.checksum),
       );

core/src/host/configuration.ts

@@ -59,6 +59,10 @@ export interface HostConfiguration {
   /** The deployment's module secrets, resolvable only under names Core derives from a module's own
    * declared keys — there is no arbitrary variable lookup. */
   readonly moduleSecrets: ModuleSecretSource;
+  /** `EKKLESIA_MODULES_DIR`, raw and unvalidated: `undefined` only when the variable is unset. Every
+   * executable passes it to `resolveModulesDirectory`, the one place it is interpreted (ADR 0048),
+   * so a relative or blank value is refused there rather than repaired here. */
+  readonly modulesDirectory: string | undefined;
   readonly storage: StorageProviderConfigInput;
 }
 
@@ -144,6 +148,7 @@ export function loadHostConfiguration(environment: HostEnvironment): HostConfigu
       username: environment.EKKLESIA_SMTP_USERNAME,
     },
     moduleSecrets: createEnvironmentModuleSecretSource(environment),
+    modulesDirectory: environment.EKKLESIA_MODULES_DIR,
     // The `S3_*` names ADR 0004 already established for this repository's Compose stack. Absent
     // endpoint means this installation has no object storage, which is a complete deployment
     // (ADR 0030).

core/src/migrations/runner.ts

@@ -2,6 +2,7 @@ import type {
   DiscoveredModuleMigration,
   ModuleMigrationAggregate,
 } from "../modules/migration-discovery.js";
+import { CORE_MIGRATION_SOURCE_ID } from "./core-source.js";
 
 const DEFAULT_MIGRATION_LOCK_TIMEOUT_MS = 10_000;
 
@@ -86,11 +87,24 @@ export interface MigrationPlanEntry {
   readonly tag: string;
 }
 
+/**
+ * Applied history kept for a module that is not installed (ADR 0048): the module id and how many of
+ * its migrations were applied. It is reported, never matched against an inventory, and never a
+ * reason to refuse planning or applying anything else.
+ */
+export interface RetainedMigrationHistory {
+  readonly appliedCount: number;
+  readonly moduleId: string;
+}
+
 export interface MigrationPlanResult {
   readonly appliedCount: number;
   readonly approvalRequiredCount: number;
   readonly entries: readonly MigrationPlanEntry[];
   readonly pendingCount: number;
+  /** Absent modules' applied history, ordered by module id; empty when every applied migration
+   * belongs to Core or an installed module. */
+  readonly retained: readonly RetainedMigrationHistory[];
 }
 
 export interface AppliedMigrationResult {
@@ -105,6 +119,8 @@ export interface MigrationApplyResult {
   readonly applied: readonly AppliedMigrationResult[];
   readonly appliedCount: number;
   readonly noOp: boolean;
+  /** The same report as `MigrationPlanResult.retained`, read under the migration lock. */
+  readonly retained: readonly RetainedMigrationHistory[];
 }
 
 export interface PlanModuleMigrationsOptions {
@@ -204,10 +220,38 @@ function validateHistoryRecordShape(record: AppliedMigrationRecord): void {
   }
 }
 
+interface ValidatedAppliedHistory {
+  /** Identities of applied migrations that belong to Core or an installed module. */
+  readonly applied: ReadonlySet<string>;
+  readonly retained: readonly RetainedMigrationHistory[];
+}
+
+/**
+ * Every module id this inventory treats as installed: each discovered module, whether or not it
+ * owns migrations, every module that contributed migrations, and always Core. A module counts as
+ * absent only when it is none of these, so a module that is installed but no longer ships its old
+ * migrations stays strict, and Core's history can never be classified as an absent module's.
+ */
+function installedMigrationSources(aggregate: ModuleMigrationAggregate): ReadonlySet<string> {
+  return new Set<string>([
+    CORE_MIGRATION_SOURCE_ID,
+    ...aggregate.discoveredModules.map((module) => module.manifest.id),
+    ...aggregate.modules.map((module) => module.moduleId),
+  ]);
+}
+
+function freezeRetained(counts: ReadonlyMap<string, number>): readonly RetainedMigrationHistory[] {
+  return Object.freeze(
+    [...counts.entries()]
+      .sort(([left], [right]) => (left < right ? -1 : left > right ? 1 : 0))
+      .map(([moduleId, appliedCount]) => Object.freeze({ appliedCount, moduleId })),
+  );
+}
+
 function validateAppliedHistoryUnchecked(
   aggregate: ModuleMigrationAggregate,
   history: readonly AppliedMigrationRecord[],
-): ReadonlySet<string> {
+): ValidatedAppliedHistory {
   if (!Array.isArray(history)) {
     throw runnerError("MIGRATION_HISTORY_INVALID");
   }
@@ -215,6 +259,9 @@ function validateAppliedHistoryUnchecked(
   const inventory = new Map(
     aggregate.migrations.map((migration) => [migration.identity, migration]),
   );
+  const installed = installedMigrationSources(aggregate);
+  const applied = new Set<string>();
+  const retained = new Map<string, number>();
   const seenOrders = new Set<number>();
   const seenIdentities = new Set<string>();
   const seenModuleIndexes = new Set<string>();
@@ -240,7 +287,19 @@ function validateAppliedHistoryUnchecked(
 
     const migration = knownMigration(inventory, record.identity);
     if (!migration) {
-      throw runnerError("MIGRATION_UNKNOWN_APPLIED");
+      if (installed.has(record.moduleId)) {
+        // Core, or a module that is installed now: its history is strict, exactly as ADR 0009
+        // established. A migration it no longer ships is a downgrade or a rewritten package.
+        throw runnerError("MIGRATION_UNKNOWN_APPLIED");
+      }
+      // An absent module's history (ADR 0048): retained and reported, never repaired, deleted, or
+      // matched against anything. It must still name its own module and tag, so a corrupt row is
+      // never mistaken for one.
+      if (record.identity !== `${record.moduleId}:${record.tag}`) {
+        throw runnerError("MIGRATION_HISTORY_INVALID");
+      }
+      retained.set(record.moduleId, (retained.get(record.moduleId) ?? 0) + 1);
+      continue;
     }
     if (
       record.moduleId !== migration.moduleId ||
@@ -252,11 +311,12 @@ function validateAppliedHistoryUnchecked(
     if (record.checksum !== migration.checksum) {
       throw runnerError("MIGRATION_CHECKSUM_MISMATCH", migration.identity);
     }
+    applied.add(record.identity);
   }
 
   for (const module of aggregate.modules) {
-    const applied = history.filter((record) => record.moduleId === module.moduleId);
+    const moduleHistory = history.filter((record) => record.moduleId === module.moduleId);
-    for (const [position, record] of applied.entries()) {
+    for (const [position, record] of moduleHistory.entries()) {
       if (record.identity !== module.migrations[position]?.identity) {
         const migration = knownMigration(inventory, record.identity);
         throw runnerError("MIGRATION_HISTORY_INVALID", migration?.identity);
@@ -264,13 +324,13 @@ function validateAppliedHistoryUnchecked(
     }
   }
 
-  return seenIdentities;
+  return Object.freeze({ applied, retained: freezeRetained(retained) });
 }
 
 function validateAppliedHistory(
   aggregate: ModuleMigrationAggregate,
   history: readonly AppliedMigrationRecord[],
-): ReadonlySet<string> {
+): ValidatedAppliedHistory {
   try {
     return validateAppliedHistoryUnchecked(aggregate, history);
   } catch (error) {
@@ -285,7 +345,7 @@ function planFromHistory(
   aggregate: ModuleMigrationAggregate,
   history: readonly AppliedMigrationRecord[],
 ): MigrationPlanResult {
-  const applied = validateAppliedHistory(aggregate, history);
+  const { applied, retained } = validateAppliedHistory(aggregate, history);
   const entries = Object.freeze(
     aggregate.migrations.map((migration): MigrationPlanEntry => {
       const isApplied = applied.has(migration.identity);
@@ -314,6 +374,7 @@ function planFromHistory(
     approvalRequiredCount,
     entries,
     pendingCount: entries.length - appliedCount,
+    retained,
   });
 }
 
@@ -472,14 +533,14 @@ export async function applyModuleMigrations(
     } catch {
       throw runnerError("MIGRATION_HISTORY_READ_FAILED");
     }
-    const applied = validateAppliedHistory(options.aggregate, history);
+    const { applied, retained } = validateAppliedHistory(options.aggregate, history);
     const pending = Object.freeze(
       options.aggregate.migrations.filter((migration) => !applied.has(migration.identity)),
     );
     await preflightApprovals(pending, options.approvals ?? denyAllMigrationApprovals);
 
     if (pending.length === 0) {
-      return Object.freeze({ applied: Object.freeze([]), appliedCount: 0, noOp: true });
+      return Object.freeze({ applied: Object.freeze([]), appliedCount: 0, noOp: true, retained });
     }
 
     let executingIdentity: string | undefined;
@@ -508,6 +569,7 @@ export async function applyModuleMigrations(
       applied: resultMigrations,
       appliedCount: resultMigrations.length,
       noOp: false,
+      retained,
     });
   } catch (error) {
     primaryError = error;

core/src/modules/database-abi-values.ts

@@ -0,0 +1,349 @@
+import {
+  type ModuleDatabaseField,
+  ModuleDatabaseError,
+  type ModuleDatabaseValue,
+} from "@ekklesia/contracts";
+
+/**
+ * The value contract of Module Database ABI v1 (ADR 0050): how parameters are encoded before they
+ * reach PostgreSQL, and how result text is decoded after. Both are Core's, and neither consults
+ * `pg`'s process-global type registry or any ORM, which module code could change or differ from.
+ *
+ * Every value travels in PostgreSQL's text format. The session settings the decoding depends on
+ * (`DateStyle`, `IntervalStyle`, `TimeZone`, `bytea_output`, `extra_float_digits`) are pinned by the
+ * executor for every ABI operation (`./database-abi.ts`).
+ */
+
+/** PostgreSQL's limit on bound parameters in one statement (the protocol's 16-bit count). */
+export const MODULE_DATABASE_MAX_PARAMETERS = 65_535;
+/** PostgreSQL's limit on array dimensions (`MAXDIM`). */
+const maximumArrayDimensions = 6;
+
+function parameterInvalid(): ModuleDatabaseError {
+  return new ModuleDatabaseError("MODULE_DATABASE_PARAMETER_INVALID");
+}
+
+function isScalar(value: unknown): boolean {
+  return (
+    value === null ||
+    typeof value === "boolean" ||
+    typeof value === "number" ||
+    typeof value === "bigint" ||
+    typeof value === "string" ||
+    value instanceof Uint8Array
+  );
+}
+
+function scalarText(value: boolean | number | bigint | string): string {
+  // `String` spells NaN, Infinity, and -Infinity exactly as PostgreSQL's float and numeric input
+  // accepts them.
+  return typeof value === "string" ? value : String(value);
+}
+
+function byteaText(value: Uint8Array): string {
+  return `\\x${Buffer.from(value.buffer, value.byteOffset, value.byteLength).toString("hex")}`;
+}
+
+function quoteArrayElement(text: string): string {
+  return `"${text.replaceAll("\\", "\\\\").replaceAll('"', '\\"')}"`;
+}
+
+/**
+ * Validates one array level and returns its PostgreSQL array literal. Every element of a level is
+ * either a sub-array or a scalar, and sibling sub-arrays have equal lengths, because PostgreSQL
+ * arrays are rectangular. Every non-null element is quoted, which PostgreSQL accepts for any element
+ * type.
+ */
+function arrayLiteral(values: readonly unknown[], depth: number): string {
+  if (depth > maximumArrayDimensions) {
+    throw parameterInvalid();
+  }
+  const elements: string[] = [];
+  let nestedLength: number | undefined;
+  let nested: boolean | undefined;
+  for (let index = 0; index < values.length; index += 1) {
+    if (!Object.hasOwn(values, index)) {
+      throw parameterInvalid();
+    }
+    const element = values[index];
+    const isNested = Array.isArray(element);
+    if (nested === undefined) {
+      nested = isNested;
+    } else if (nested !== isNested) {
+      throw parameterInvalid();
+    }
+    if (isNested) {
+      if (nestedLength === undefined) {
+        nestedLength = element.length;
+      } else if (nestedLength !== element.length) {
+        throw parameterInvalid();
+      }
+      elements.push(arrayLiteral(element, depth + 1));
+    } else if (element === null) {
+      elements.push("NULL");
+    } else if (element instanceof Uint8Array) {
+      elements.push(quoteArrayElement(byteaText(element)));
+    } else if (isScalar(element)) {
+      elements.push(quoteArrayElement(scalarText(element as boolean | number | bigint | string)));
+    } else {
+      throw parameterInvalid();
+    }
+  }
+  return `{${elements.join(",")}}`;
+}
+
+/**
+ * Validates `values` against the ABI's parameter set and encodes each one into the only forms the
+ * driver then passes through unchanged: `null`, a string, or a `Buffer` copy of a `Uint8Array`.
+ * Anything else, including `undefined`, `Date`, plain objects, other class instances, functions,
+ * symbols, sparse or ragged arrays, and arrays deeper than PostgreSQL allows, is refused before
+ * anything reaches PostgreSQL. The error never names the value.
+ */
+export function encodeModuleDatabaseParameters(values: unknown): (string | Buffer | null)[] {
+  if (values === undefined) {
+    return [];
+  }
+  if (!Array.isArray(values) || values.length > MODULE_DATABASE_MAX_PARAMETERS) {
+    throw parameterInvalid();
+  }
+  const encoded: (string | Buffer | null)[] = [];
+  for (let index = 0; index < values.length; index += 1) {
+    if (!Object.hasOwn(values, index)) {
+      throw parameterInvalid();
+    }
+    const value: unknown = values[index];
+    if (value === null) {
+      encoded.push(null);
+    } else if (value instanceof Uint8Array) {
+      // A copy: the driver serializes when the statement is sent, which may be after the caller
+      // has changed its own bytes.
+      encoded.push(Buffer.from(value));
+    } else if (Array.isArray(value)) {
+      encoded.push(arrayLiteral(value, 1));
+    } else if (isScalar(value)) {
+      encoded.push(scalarText(value as boolean | number | bigint | string));
+    } else {
+      throw parameterInvalid();
+    }
+  }
+  return encoded;
+}
+
+// --- Results -----------------------------------------------------------------------------------
+
+type ScalarDecoder = (text: string) => ModuleDatabaseValue;
+
+const asText: ScalarDecoder = (text) => text;
+const asBoolean: ScalarDecoder = (text) => text === "t";
+const asInteger: ScalarDecoder = (text) => Number.parseInt(text, 10);
+// `Number` reads PostgreSQL's NaN, Infinity, -Infinity, and exponent forms. With
+// `extra_float_digits` pinned to 1 the text is the shortest form that round-trips exactly.
+const asFloat: ScalarDecoder = (text) => Number(text);
+
+function hexDigit(code: number): number {
+  if (code >= 48 && code <= 57) {
+    return code - 48;
+  }
+  if (code >= 97 && code <= 102) {
+    return code - 87;
+  }
+  if (code >= 65 && code <= 70) {
+    return code - 55;
+  }
+  return -1;
+}
+
+/**
+ * `bytea` text to bytes. The executor pins `bytea_output` to `hex`; the older `escape` form is read
+ * too, so a transaction that changed the setting still decodes faithfully rather than failing.
+ * Always a plain `Uint8Array`, never a `Buffer`.
+ */
+const asBytes: ScalarDecoder = (text) => {
+  if (text.startsWith("\\x")) {
+    const length = (text.length - 2) / 2;
+    const bytes = new Uint8Array(length);
+    for (let index = 0; index < length; index += 1) {
+      const high = hexDigit(text.charCodeAt(2 + index * 2));
+      const low = hexDigit(text.charCodeAt(3 + index * 2));
+      bytes[index] = high * 16 + low;
+    }
+    return bytes;
+  }
+  const bytes: number[] = [];
+  for (let index = 0; index < text.length; index += 1) {
+    const code = text.charCodeAt(index);
+    if (code === 92 && text.charCodeAt(index + 1) === 92) {
+      bytes.push(92);
+      index += 1;
+    } else if (code === 92) {
+      bytes.push(Number.parseInt(text.slice(index + 1, index + 4), 8));
+      index += 3;
+    } else {
+      bytes.push(code);
+    }
+  }
+  return Uint8Array.from(bytes);
+};
+
+/** Built-in scalar type OIDs with a decoding other than "PostgreSQL's text output, unchanged". Every
+ * type not listed here, `int8`, `numeric`, date and time types, `json`, and `jsonb` included,
+ * arrives as its exact text. */
+const scalarDecoders: ReadonlyMap<number, ScalarDecoder> = new Map([
+  [16, asBoolean], // bool
+  [17, asBytes], // bytea
+  [21, asInteger], // int2
+  [23, asInteger], // int4
+  [26, asInteger], // oid
+  [700, asFloat], // float4
+  [701, asFloat], // float8
+]);
+
+/** Built-in array type OIDs, each with its element type OID. An array of a type not listed here
+ * (an enum, a domain, an extension type) arrives as its text, like any other type. */
+const arrayElementTypes: ReadonlyMap<number, number> = new Map([
+  [1000, 16], // bool[]
+  [1001, 17], // bytea[]
+  [1002, 18], // "char"[]
+  [1003, 19], // name[]
+  [1005, 21], // int2[]
+  [1007, 23], // int4[]
+  [1009, 25], // text[]
+  [1014, 1042], // bpchar[]
+  [1015, 1043], // varchar[]
+  [1016, 20], // int8[]
+  [1021, 700], // float4[]
+  [1022, 701], // float8[]
+  [1028, 26], // oid[]
+  [1115, 1114], // timestamp[]
+  [1182, 1082], // date[]
+  [1183, 1083], // time[]
+  [1185, 1184], // timestamptz[]
+  [1187, 1186], // interval[]
+  [1231, 1700], // numeric[]
+  [1270, 1266], // timetz[]
+  [2951, 2950], // uuid[]
+  [199, 114], // json[]
+  [3807, 3802], // jsonb[]
+]);
+
+class ArrayTextError extends Error {}
+
+/**
+ * Parses PostgreSQL's array text output into nested arrays, each element decoded by `decode`.
+ * Unquoted `NULL` is null; a quoted `"NULL"` is the string. A non-default lower bound
+ * (`[0:1]={…}`) is not represented: a JavaScript array is a zero-based list. Every element type this
+ * decodes uses `,` as its delimiter.
+ */
+export function parsePostgresArrayText(text: string, decode: ScalarDecoder): ModuleDatabaseValue[] {
+  let position = 0;
+  if (text.startsWith("[")) {
+    const equals = text.indexOf("=");
+    if (equals === -1) {
+      throw new ArrayTextError();
+    }
+    position = equals + 1;
+  }
+
+  function parseArray(): ModuleDatabaseValue[] {
+    if (text[position] !== "{") {
+      throw new ArrayTextError();
+    }
+    position += 1;
+    const items: ModuleDatabaseValue[] = [];
+    if (text[position] === "}") {
+      position += 1;
+      return items;
+    }
+    for (;;) {
+      const character = text[position];
+      if (character === "{") {
+        items.push(parseArray());
+      } else if (character === '"') {
+        position += 1;
+        let element = "";
+        for (;;) {
+          const next = text[position];
+          if (next === undefined) {
+            throw new ArrayTextError();
+          }
+          if (next === "\\") {
+            element += text[position + 1] ?? "";
+            position += 2;
+          } else if (next === '"') {
+            position += 1;
+            break;
+          } else {
+            element += next;
+            position += 1;
+          }
+        }
+        items.push(decode(element));
+      } else {
+        const start = position;
+        while (position < text.length && text[position] !== "," && text[position] !== "}") {
+          position += 1;
+        }
+        const element = text.slice(start, position);
+        items.push(element.toUpperCase() === "NULL" ? null : decode(element));
+      }
+      if (text[position] === ",") {
+        position += 1;
+      } else if (text[position] === "}") {
+        position += 1;
+        return items;
+      } else {
+        throw new ArrayTextError();
+      }
+    }
+  }
+
+  const parsed = parseArray();
+  if (position !== text.length) {
+    throw new ArrayTextError();
+  }
+  return parsed;
+}
+
+function scalarDecoder(typeOid: number): ScalarDecoder {
+  return scalarDecoders.get(typeOid) ?? asText;
+}
+
+/** Decodes one non-null column value from its PostgreSQL text by the column's type OID. */
+export function decodeModuleDatabaseValue(typeOid: number, text: string): ModuleDatabaseValue {
+  const elementType = arrayElementTypes.get(typeOid);
+  if (elementType === undefined) {
+    return scalarDecoder(typeOid)(text);
+  }
+  try {
+    return parsePostgresArrayText(text, scalarDecoder(elementType));
+  } catch {
+    // PostgreSQL produced this text, so it cannot be malformed; should it ever be, the column still
+    // arrives faithfully, as text, rather than as a guess.
+    return text;
+  }
+}
+
+/**
+ * The `types` object handed to `pg` for every ABI statement. Its parser returns the raw text for
+ * every type, so the driver's global registry, which module code could change, is never consulted
+ * and the ABI decodes from text itself. It is an empty array as well because the driver also reads
+ * the same option as the Parse message's parameter-type list: empty, so PostgreSQL infers every
+ * parameter type from the statement.
+ */
+export const rawTextTypes: { getTypeParser: () => (text: string) => string } & never[] =
+  Object.freeze(
+    Object.assign([] as never[], {
+      getTypeParser: () => (text: string) => text,
+    }),
+  );
+
+/** Decodes one positional row of raw driver text. */
+export function decodeModuleDatabaseRow(
+  fields: readonly ModuleDatabaseField[],
+  raw: readonly unknown[],
+): ModuleDatabaseValue[] {
+  return fields.map((field, index) => {
+    const value = raw[index];
+    return typeof value === "string" ? decodeModuleDatabaseValue(field.typeOid, value) : null;
+  });
+}

core/src/modules/database-abi.ts

@@ -0,0 +1,596 @@
+import {
+  MODULE_DATABASE_ABI_VERSION,
+  type ModuleDatabaseArrayRow,
+  ModuleDatabaseError,
+  type ModuleDatabaseErrorCode,
+  type ModuleDatabaseExecutor,
+  type ModuleDatabaseField,
+  type ModuleDatabaseObjectRow,
+  type ModuleDatabaseQueryable,
+  type ModuleDatabaseQueryResult,
+  type ModuleDatabaseTransaction,
+  type ModuleId,
+  moduleIdSchema,
+} from "@ekklesia/contracts";
+import { DatabaseError, type Pool, type PoolClient, type QueryArrayConfig } from "pg";
+import {
+  decodeModuleDatabaseRow,
+  encodeModuleDatabaseParameters,
+  rawTextTypes,
+} from "./database-abi-values.js";
+
+/**
+ * Core's Module Database ABI v1 executor (ADR 0050).
+ *
+ * A module hands Core SQL text, ordered parameter values, and a row mode; Core hands back decoded
+ * rows, column metadata, and stable errors. No ORM, driver, pool, client, or connection object ever
+ * crosses in either direction. The executor is built over the one pool the API already owns
+ * (ADR 0016) and never closes it.
+ *
+ * This is a correctness and compatibility boundary, **not a security sandbox**: a trusted module can
+ * still send any SQL its database role permits. Nothing here inspects table names.
+ *
+ * ### Connections and session state
+ *
+ * Every ABI operation, a top-level statement or a whole transaction, borrows a connection from the
+ * pool, pins the session settings the ABI's decoding depends on, does its work, and resets the
+ * session with `DISCARD ALL` before returning the connection. So no setting, temporary table,
+ * listener, advisory lock, prepared statement, or role change a module makes survives the operation
+ * that made it, and nothing the ABI pinned reaches the pool's other users. A connection that cannot
+ * be reset cleanly, or that is not idle when the operation ends, is destroyed rather than returned.
+ * `DISCARD ALL` also deallocates named prepared statements; Core uses none on the shared pool.
+ *
+ * ### One statement per `query`
+ *
+ * Every ABI statement is sent with PostgreSQL's extended query protocol, forced with the driver's
+ * `queryMode: "extended"` even when there are no parameters. PostgreSQL itself refuses a Parse
+ * message holding more than one statement (SQLSTATE 42601), using its own SQL grammar, so comments,
+ * quoted literals, and semicolons inside them are never mistaken for a second statement. Core does
+ * not parse SQL. A statement text that holds no statement at all is refused after PostgreSQL reports
+ * it empty.
+ *
+ * ### Transaction control belongs to the callbacks
+ *
+ * Transaction-control SQL (`BEGIN`, `START TRANSACTION`, `COMMIT`, `ROLLBACK`, `SAVEPOINT`,
+ * `RELEASE SAVEPOINT`, `PREPARE TRANSACTION`, and their aliases) is forbidden through `query`: a
+ * conformance rule for trusted module code, not a security guarantee. Core cannot refuse such a
+ * statement beforehand without parsing SQL, which it does not do, and it cannot undo one PostgreSQL
+ * has already executed: a `COMMIT` sent through a transaction's `query` has committed by the time
+ * Core sees it. What Core does is detect the violation afterwards, from what PostgreSQL itself
+ * reports (the statement's command tag, and the protocol's transaction status), and fail safely:
+ * the call rejects, an enclosing transaction is never committed by Core and rejects too, and the
+ * connection is destroyed rather than returned to the pool. The commit and rollback guarantees of
+ * the transaction API apply to conforming use.
+ */
+
+/** The settings the ABI's decoding and determinism depend on, pinned for every ABI operation. */
+const pinSessionStatement =
+  "SET TimeZone TO 'UTC'; SET DateStyle TO 'ISO, MDY'; SET IntervalStyle TO 'postgres'; " +
+  "SET bytea_output TO 'hex'; SET extra_float_digits TO 1";
+const resetSessionStatement = "DISCARD ALL";
+
+const transactionControlCommands: ReadonlySet<string> = new Set([
+  "BEGIN",
+  "COMMIT",
+  "PREPARE",
+  "RELEASE",
+  "ROLLBACK",
+  "SAVEPOINT",
+  "START",
+]);
+
+const isolationStatements: ReadonlyMap<unknown, string> = new Map([
+  ["read committed", "READ COMMITTED"],
+  ["repeatable read", "REPEATABLE READ"],
+  ["serializable", "SERIALIZABLE"],
+]);
+
+/** `pg` 8.22 reports the protocol's ReadyForQuery transaction status through this method, which
+ * its type declarations omit. `acquire` refuses a client without it rather than guessing. */
+type AbiClient = PoolClient & { getTransactionStatus(): string | null };
+
+interface PreparedQuery {
+  readonly config: QueryArrayConfig;
+  readonly rowMode: "array" | "object";
+}
+
+interface RawResult {
+  readonly command: string | null;
+  readonly fields: readonly { readonly dataTypeID: number; readonly name: string }[];
+  readonly rowCount: number | null;
+  readonly rows: readonly unknown[][];
+}
+
+function databaseError(code: ModuleDatabaseErrorCode, cause?: unknown): ModuleDatabaseError {
+  // Only PostgreSQL's own SQLSTATE survives. The driver's message, detail, hint, position, and
+  // object names, and every non-PostgreSQL error, are dropped here.
+  if (cause instanceof DatabaseError && typeof cause.code === "string") {
+    return new ModuleDatabaseError(code, { sqlState: cause.code });
+  }
+  return new ModuleDatabaseError(code);
+}
+
+/** A PostgreSQL error leaves the connection usable; anything else (a dropped connection, a
+ * client-side timeout) may leave it mid-protocol, so it must be destroyed. */
+function connectionSurvives(error: unknown): boolean {
+  return error instanceof DatabaseError;
+}
+
+function prepareQuery(request: unknown): PreparedQuery {
+  if (typeof request !== "object" || request === null || Array.isArray(request)) {
+    throw new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+  }
+  for (const key of Object.keys(request)) {
+    if (key !== "text" && key !== "values" && key !== "rowMode") {
+      throw new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+    }
+  }
+  const { rowMode, text, values } = request as Record<string, unknown>;
+  if (typeof text !== "string" || text.length === 0) {
+    throw new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+  }
+  if (rowMode !== undefined && rowMode !== "object" && rowMode !== "array") {
+    throw new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+  }
+  const config = {
+    queryMode: "extended",
+    rowMode: "array",
+    text,
+    types: rawTextTypes,
+    values: encodeModuleDatabaseParameters(values),
+  };
+  return { config: config as unknown as QueryArrayConfig, rowMode: rowMode ?? "object" };
+}
+
+function beginStatement(options: unknown): string {
+  if (options === undefined) {
+    return "BEGIN ISOLATION LEVEL READ COMMITTED READ WRITE";
+  }
+  if (typeof options !== "object" || options === null || Array.isArray(options)) {
+    throw new ModuleDatabaseError("MODULE_DATABASE_TRANSACTION_OPTION_INVALID");
+  }
+  for (const key of Object.keys(options)) {
+    if (key !== "isolation" && key !== "readOnly") {
+      throw new ModuleDatabaseError("MODULE_DATABASE_TRANSACTION_OPTION_INVALID");
+    }
+  }
+  const { isolation, readOnly } = options as Record<string, unknown>;
+  const level = isolation === undefined ? "READ COMMITTED" : isolationStatements.get(isolation);
+  if (level === undefined || (readOnly !== undefined && typeof readOnly !== "boolean")) {
+    throw new ModuleDatabaseError("MODULE_DATABASE_TRANSACTION_OPTION_INVALID");
+  }
+  return `BEGIN ISOLATION LEVEL ${level} ${readOnly === true ? "READ ONLY" : "READ WRITE"}`;
+}
+
+function buildResult(
+  raw: RawResult,
+  rowMode: "array" | "object",
+): ModuleDatabaseQueryResult<ModuleDatabaseArrayRow | ModuleDatabaseObjectRow> {
+  if (typeof raw.command !== "string" || raw.command === "") {
+    // PostgreSQL answered with EmptyQueryResponse: the text held no statement.
+    throw new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+  }
+  const fields: readonly ModuleDatabaseField[] = Object.freeze(
+    raw.fields.map((field) => Object.freeze({ name: field.name, typeOid: field.dataTypeID })),
+  );
+  const decoded = raw.rows.map((row) => decodeModuleDatabaseRow(fields, row));
+  let rows: readonly (ModuleDatabaseArrayRow | ModuleDatabaseObjectRow)[];
+  if (rowMode === "array") {
+    rows = decoded;
+  } else {
+    if (new Set(fields.map((field) => field.name)).size !== fields.length) {
+      // Object rows cannot hold two columns with one name; refusing beats dropping one.
+      throw new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+    }
+    // `Object.fromEntries` defines properties, so a column named `__proto__` stays a column.
+    rows = decoded.map((row) =>
+      Object.fromEntries(fields.map((field, index) => [field.name, row[index] ?? null])),
+    );
+  }
+  return Object.freeze({
+    command: raw.command,
+    fields,
+    rowCount: raw.rowCount ?? null,
+    rows: Object.freeze(rows),
+  });
+}
+
+/** A borrowed client's `error` events are already reported through the statement they interrupt.
+ * The pool only listens to idle clients, so without this a connection the server terminates while
+ * borrowed would surface as an unhandled `error` event. */
+function ignoreClientError(): void {}
+
+function destroy(client: AbiClient): void {
+  client.removeListener("error", ignoreClientError);
+  client.release(true);
+}
+
+async function acquire(pool: Pool, failure: ModuleDatabaseErrorCode): Promise<AbiClient> {
+  let client: AbiClient;
+  try {
+    client = (await pool.connect()) as AbiClient;
+  } catch (error) {
+    throw databaseError(failure, error);
+  }
+  client.on("error", ignoreClientError);
+  if (typeof client.getTransactionStatus !== "function") {
+    destroy(client);
+    throw new ModuleDatabaseError(failure);
+  }
+  try {
+    await client.query(pinSessionStatement);
+  } catch (error) {
+    destroy(client);
+    throw databaseError(failure, error);
+  }
+  return client;
+}
+
+/** Returns a connection to the pool only when it is idle and resets cleanly; destroys it
+ * otherwise. Never throws. */
+async function relinquish(client: AbiClient, healthy: boolean): Promise<void> {
+  if (!healthy || client.getTransactionStatus() !== "I") {
+    destroy(client);
+    return;
+  }
+  try {
+    await client.query(resetSessionStatement);
+  } catch {
+    destroy(client);
+    return;
+  }
+  client.removeListener("error", ignoreClientError);
+  client.release();
+}
+
+/** One open scope: a transaction or a savepoint inside it. */
+interface Scope {
+  activeChild: Scope | undefined;
+  readonly children: Set<Scope>;
+  closed: boolean;
+  /** Operations started through this scope's executor that have not settled yet. */
+  pending: number;
+}
+
+interface TransactionState {
+  readonly client: AbiClient;
+  healthy: boolean;
+  /** Set when the transaction can no longer be committed: transaction control sent through
+   * `query`, or a savepoint that could not be undone. */
+  failure: ModuleDatabaseError | undefined;
+  finished: boolean;
+  /** Settled-never-rejecting shadows of every statement sent on the connection. */
+  readonly inflight: Set<Promise<void>>;
+  savepoints: number;
+}
+
+function newScope(parent?: Scope): Scope {
+  const scope: Scope = { activeChild: undefined, children: new Set(), closed: false, pending: 0 };
+  parent?.children.add(scope);
+  return scope;
+}
+
+function closeScope(scope: Scope): void {
+  scope.closed = true;
+  for (const child of scope.children) {
+    closeScope(child);
+  }
+}
+
+function assertActive(scope: Scope): void {
+  if (scope.closed) {
+    throw new ModuleDatabaseError("MODULE_DATABASE_SCOPE_CLOSED");
+  }
+  if (scope.activeChild !== undefined) {
+    throw new ModuleDatabaseError("MODULE_DATABASE_SCOPE_INACTIVE");
+  }
+}
+
+/** Once a transaction can no longer be committed, its scopes send nothing more. After a
+ * transaction-control violation in particular, a later statement would otherwise run outside any
+ * transaction, as its own autocommitted statement. */
+function assertUsable(state: TransactionState): void {
+  if (state.failure !== undefined) {
+    throw new ModuleDatabaseError(state.failure.code);
+  }
+}
+
+function track<T>(state: TransactionState, promise: Promise<T>): Promise<T> {
+  const shadow = promise.then(
+    () => undefined,
+    () => undefined,
+  );
+  state.inflight.add(shadow);
+  void shadow.then(() => state.inflight.delete(shadow));
+  return promise;
+}
+
+/** Waits until every statement already sent has settled, including any sent while waiting. */
+async function drain(state: TransactionState): Promise<void> {
+  while (state.inflight.size > 0) {
+    await Promise.all([...state.inflight]);
+  }
+}
+
+/** Runs one of Core's own transaction-control statements. Refuses, without sending anything, once
+ * the transaction has finished. */
+async function control(state: TransactionState, statement: string): Promise<void> {
+  if (state.finished) {
+    throw new ModuleDatabaseError("MODULE_DATABASE_SCOPE_CLOSED");
+  }
+  try {
+    await track(state, state.client.query(statement));
+  } catch (error) {
+    if (!connectionSurvives(error)) {
+      state.healthy = false;
+    }
+    throw databaseError("MODULE_DATABASE_TRANSACTION_FAILED", error);
+  }
+}
+
+async function rollback(state: TransactionState): Promise<void> {
+  try {
+    await state.client.query("ROLLBACK");
+  } catch {
+    state.healthy = false;
+  }
+}
+
+type Outcome<T> = { readonly value: T } | { readonly error: unknown };
+
+async function settle<T>(run: () => Promise<T> | T): Promise<Outcome<T>> {
+  try {
+    return { value: await run() };
+  } catch (error) {
+    return { error };
+  }
+}
+
+const moduleByExecutor = new WeakMap<object, ModuleId>();
+
+/** Which module an ABI executor, or a transaction or savepoint executor derived from it, belongs
+ * to. For Core's own logging, diagnostics, and attribution; never exposed to modules. */
+export function moduleDatabaseExecutorModuleId(executor: object): ModuleId | undefined {
+  return moduleByExecutor.get(executor);
+}
+
+export interface ModuleDatabaseExecutorOptions {
+  /** The module this executor serves. Carried for attribution only: the ABI enforces no table
+   * ownership at run time (ADR 0050). */
+  readonly moduleId: ModuleId;
+}
+
+/**
+ * Creates one module's ABI v1 executor over the API's existing pool. Synchronous and free of I/O:
+ * nothing touches the database until the module calls it. The returned object, and every
+ * transaction and savepoint executor it hands out, is frozen and holds exactly the ABI's members.
+ */
+export function createModuleDatabaseExecutor(
+  pool: Pool,
+  options: ModuleDatabaseExecutorOptions,
+): ModuleDatabaseExecutor {
+  const parsedModuleId = moduleIdSchema.safeParse(options.moduleId);
+  if (!parsedModuleId.success) {
+    throw new TypeError("A module database executor needs a valid module ID.");
+  }
+  const moduleId = parsedModuleId.data;
+
+  async function query(
+    request: unknown,
+  ): Promise<ModuleDatabaseQueryResult<ModuleDatabaseArrayRow | ModuleDatabaseObjectRow>> {
+    const prepared = prepareQuery(request);
+    const client = await acquire(pool, "MODULE_DATABASE_QUERY_FAILED");
+    let healthy = true;
+    try {
+      let raw: RawResult;
+      try {
+        raw = (await client.query(prepared.config)) as unknown as RawResult;
+      } catch (error) {
+        healthy = connectionSurvives(error);
+        throw databaseError("MODULE_DATABASE_QUERY_FAILED", error);
+      }
+      if (
+        (raw.command !== null && transactionControlCommands.has(raw.command)) ||
+        client.getTransactionStatus() !== "I"
+      ) {
+        // A transaction-control violation. PostgreSQL has already run it; the connection is
+        // destroyed below rather than returned in a state Core did not choose.
+        healthy = false;
+        throw new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+      }
+      return buildResult(raw, prepared.rowMode);
+    } finally {
+      await relinquish(client, healthy);
+    }
+  }
+
+  function scopeExecutor(state: TransactionState, scope: Scope): ModuleDatabaseTransaction {
+    async function scopeQuery(
+      request: unknown,
+    ): Promise<ModuleDatabaseQueryResult<ModuleDatabaseArrayRow | ModuleDatabaseObjectRow>> {
+      assertActive(scope);
+      assertUsable(state);
+      const prepared = prepareQuery(request);
+      scope.pending += 1;
+      try {
+        let raw: RawResult;
+        try {
+          raw = (await track(state, state.client.query(prepared.config))) as unknown as RawResult;
+        } catch (error) {
+          if (!connectionSurvives(error)) {
+            state.healthy = false;
+          }
+          throw databaseError("MODULE_DATABASE_QUERY_FAILED", error);
+        }
+        if (
+          (raw.command !== null && transactionControlCommands.has(raw.command)) ||
+          state.client.getTransactionStatus() === "I"
+        ) {
+          // A transaction-control violation. PostgreSQL has already run it, and Core cannot undo
+          // that; it can only never commit this transaction itself, and destroy the connection.
+          state.failure ??= new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+          state.healthy = false;
+          throw new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+        }
+        return buildResult(raw, prepared.rowMode);
+      } finally {
+        scope.pending -= 1;
+      }
+    }
+
+    async function savepoint<T>(
+      callback: (savepoint: ModuleDatabaseTransaction) => Promise<T> | T,
+    ): Promise<T> {
+      assertActive(scope);
+      assertUsable(state);
+      if (typeof callback !== "function") {
+        throw new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+      }
+      scope.pending += 1;
+      const child = newScope(scope);
+      scope.activeChild = child;
+      state.savepoints += 1;
+      // Core's own identifier: a fixed prefix and a counter, never anything a module supplied.
+      const name = `ekklesia_savepoint_${state.savepoints}`;
+      try {
+        await control(state, `SAVEPOINT ${name}`);
+        if (child.closed) {
+          throw new ModuleDatabaseError("MODULE_DATABASE_SCOPE_CLOSED");
+        }
+        const outcome = await settle(() => callback(scopeExecutor(state, child)));
+        const outstanding = child.pending > 0;
+        closeScope(child);
+        await drain(state);
+        if (scope.closed) {
+          // The enclosing transaction finished first; it rolls back, and nothing more is sent.
+          throw new ModuleDatabaseError("MODULE_DATABASE_SCOPE_CLOSED");
+        }
+        if ("error" in outcome) {
+          // A rejected callback's own error stays the error, even if sibling work it started was
+          // still settling: that work has been drained, and is undone here with everything else.
+          try {
+            await control(state, `ROLLBACK TO SAVEPOINT ${name}`);
+            await control(state, `RELEASE SAVEPOINT ${name}`);
+          } catch (error) {
+            state.failure ??= new ModuleDatabaseError("MODULE_DATABASE_TRANSACTION_FAILED");
+            throw error;
+          }
+          throw outcome.error;
+        }
+        if (outstanding) {
+          // A callback that resolved with work outstanding forgot an await. Roll back to the
+          // savepoint and never release it.
+          try {
+            await control(state, `ROLLBACK TO SAVEPOINT ${name}`);
+          } catch (error) {
+            state.failure ??= new ModuleDatabaseError("MODULE_DATABASE_TRANSACTION_FAILED");
+            throw error;
+          }
+          throw new ModuleDatabaseError("MODULE_DATABASE_SCOPE_WORK_OUTSTANDING");
+        }
+        try {
+          await control(state, `RELEASE SAVEPOINT ${name}`);
+        } catch (releaseError) {
+          // Typically a failed statement left the transaction aborted. Undo the savepoint so the
+          // transaction stays usable, and report that this savepoint did not complete.
+          try {
+            await control(state, `ROLLBACK TO SAVEPOINT ${name}`);
+            await control(state, `RELEASE SAVEPOINT ${name}`);
+          } catch {
+            state.failure ??= new ModuleDatabaseError("MODULE_DATABASE_TRANSACTION_FAILED");
+          }
+          throw releaseError;
+        }
+        return (outcome as { readonly value: T }).value;
+      } finally {
+        closeScope(child);
+        if (scope.activeChild === child) {
+          scope.activeChild = undefined;
+        }
+        scope.pending -= 1;
+      }
+    }
+
+    const executor = Object.freeze({
+      abiVersion: MODULE_DATABASE_ABI_VERSION,
+      query: scopeQuery as ModuleDatabaseQueryable["query"],
+      savepoint,
+    });
+    moduleByExecutor.set(executor, moduleId);
+    return executor;
+  }
+
+  async function transaction<T>(
+    callback: (transaction: ModuleDatabaseTransaction) => Promise<T> | T,
+    options?: unknown,
+  ): Promise<T> {
+    if (typeof callback !== "function") {
+      throw new ModuleDatabaseError("MODULE_DATABASE_REQUEST_INVALID");
+    }
+    const begin = beginStatement(options);
+    const client = await acquire(pool, "MODULE_DATABASE_TRANSACTION_FAILED");
+    const state: TransactionState = {
+      client,
+      failure: undefined,
+      finished: false,
+      healthy: true,
+      inflight: new Set(),
+      savepoints: 0,
+    };
+    try {
+      try {
+        await client.query(begin);
+      } catch (error) {
+        state.healthy = connectionSurvives(error);
+        throw databaseError("MODULE_DATABASE_TRANSACTION_FAILED", error);
+      }
+      const scope = newScope();
+      const outcome = await settle(() => callback(scopeExecutor(state, scope)));
+      const outstanding = scope.pending > 0;
+      closeScope(scope);
+      await drain(state);
+      state.finished = true;
+
+      if ("error" in outcome) {
+        // The callback's own error stays primary, even when sibling work it started (say, the
+        // other half of a `Promise.all`) was still settling. That work has been drained, and rolls
+        // back with the rest; outstanding work never leads to a commit.
+        await rollback(state);
+        throw outcome.error;
+      }
+      if (outstanding) {
+        // The callback resolved with work it never awaited: a forgotten `await`.
+        await rollback(state);
+        throw new ModuleDatabaseError("MODULE_DATABASE_SCOPE_WORK_OUTSTANDING");
+      }
+      if (state.failure !== undefined) {
+        await rollback(state);
+        throw state.failure;
+      }
+      let committed: { readonly command: string | null };
+      try {
+        committed = await client.query("COMMIT");
+      } catch (error) {
+        state.healthy = connectionSurvives(error);
+        throw databaseError("MODULE_DATABASE_TRANSACTION_FAILED", error);
+      }
+      if (committed.command !== "COMMIT") {
+        // PostgreSQL answers COMMIT with ROLLBACK when a failed statement had aborted the
+        // transaction. Nothing was committed, and PostgreSQL supplied no SQLSTATE to report.
+        throw new ModuleDatabaseError("MODULE_DATABASE_TRANSACTION_FAILED");
+      }
+      return outcome.value;
+    } finally {
+      state.finished = true;
+      await relinquish(client, state.healthy);
+    }
+  }
+
+  const executor = Object.freeze({
+    abiVersion: MODULE_DATABASE_ABI_VERSION,
+    query: query as ModuleDatabaseQueryable["query"],
+    transaction: transaction as ModuleDatabaseExecutor["transaction"],
+  });
+  moduleByExecutor.set(executor, moduleId);
+  return executor;
+}

core/src/modules/database.ts

@@ -1,7 +1,54 @@
-import type { ModuleDatabase } from "@ekklesia/contracts";
+import type { ModuleDatabaseAbiRuntimeServices, ModuleRuntimeServices } from "@ekklesia/contracts";
-import { drizzle } from "drizzle-orm/node-postgres";
+import { drizzle, type NodePgDatabase } from "drizzle-orm/node-postgres";
 import type { Pool } from "pg";
 
+/**
+ * A trusted backend module's typed Drizzle query surface — the same query-building methods a
+ * platform-owned Drizzle instance exposes, restricted to exactly the operations a module needs to
+ * read and write its own tables. Derived with `Pick` from the real `drizzle-orm/node-postgres`
+ * database type rather than hand-declared, so every method keeps Drizzle's own table-aware
+ * argument and result inference exactly as-is — a module calling `database.select().from(table)`
+ * or `database.insert(table).values(...)` gets the identical typed builder a direct Drizzle caller
+ * would, with no `any`/`unknown` erasure anywhere in the chain.
+ *
+ * Deliberately excludes everything `NodePgDatabase` or the `drizzle(...)` factory otherwise
+ * exposes: `$client` (the raw `pg` client/pool), `_` (internal session/dialect/schema state),
+ * `query` (a relational-query builder tied to one schema, which would have to span every
+ * installed module's tables to exist here at all), `$cache`, `$count`, `$with`, `with`, and
+ * `refreshMaterializedView`. There is no connection string, pool, session, or dialect object
+ * reachable through this type. Carries no schema generic — a module brings its own Drizzle table
+ * objects to each call, so there is no global relational schema spanning every installed module for
+ * this type to leak.
+ *
+ * Core's own, private type (ADR 0053): it moved here from `@ekklesia/contracts` so no published
+ * package references Drizzle. New modules use the Module Database ABI v1 instead (ADR 0050), and
+ * the Module SDK never exposes this facade's type.
+ *
+ * This is an integration boundary, not a security sandbox: modules are trusted, compiled backend
+ * plugins that already run arbitrary code in this process, exactly like every other lifecycle hook
+ * and HTTP handler they define. `ModuleDatabase` exists to keep a module's code Drizzle-typed and
+ * decoupled from how the platform physically connects to PostgreSQL — not to defend against a
+ * malicious module, which this facade cannot do and does not attempt to do.
+ */
+export type ModuleDatabase = Pick<
+  NodePgDatabase,
+  | "select"
+  | "selectDistinct"
+  | "selectDistinctOn"
+  | "insert"
+  | "update"
+  | "delete"
+  | "execute"
+  | "transaction"
+>;
+
+/** The services a legacy module's hooks and handlers receive: the legacy facade. */
+export type LegacyModuleRuntimeServices = ModuleRuntimeServices<ModuleDatabase>;
+/** The services Core hands any started module: the legacy facade or the ABI v1 executor. */
+export type AnyModuleRuntimeServices =
+  | LegacyModuleRuntimeServices
+  | ModuleDatabaseAbiRuntimeServices;
+
 /**
  * A typed `ModuleDatabase` view over an externally owned pool — the module-facing counterpart to
  * `createIdentityDrizzleView` (`core/src/identity/database.ts`) and

core/src/modules/discovery.ts

@@ -47,6 +47,7 @@ export type ModuleDiscoveryIssueCode =
   | "MODULE_PLATFORM_INCOMPATIBLE"
   | "MODULE_SDK_INCOMPATIBLE"
   | "MODULE_VERSION_MISMATCH"
+  | "MODULES_DIRECTORY_INVALID"
   | "MODULES_DIRECTORY_UNREADABLE";
 
 export interface ModuleDiscoveryIssue {
@@ -117,9 +118,35 @@ export interface DiscoveredModule {
 export interface ModuleDiscoveryOptions {
   readonly moduleSdkVersion: string;
   readonly modulesDirectory: string;
+  /**
+   * True when an operator configured the directory explicitly (`EKKLESIA_MODULES_DIR`, ADR 0048).
+   * A configured directory that is missing, not a directory, or not an absolute path then fails
+   * discovery closed rather than reading as zero modules: a mistyped mount must never quietly start
+   * the platform with nothing installed. False or omitted keeps the development default lenient,
+   * where a checkout with no `modules/` simply has no modules.
+   */
+  readonly modulesDirectoryRequired?: boolean;
   readonly platformVersion: string;
 }
 
+/** The one sanitized message for an unusable configured modules directory. It never carries the
+ * value: a path is machine detail, and a misplaced value could be anything at all. */
+export const MODULES_DIRECTORY_INVALID_MESSAGE = "EKKLESIA_MODULES_DIR must be an absolute path.";
+
+/**
+ * Whether a configured modules directory is usable as given: a non-empty absolute path with no
+ * surrounding whitespace and no NUL byte. Deliberately strict rather than forgiving, because
+ * trimming or resolving a near-miss would silently pick a directory the operator did not name.
+ */
+export function isUsableModulesDirectoryPath(value: string): boolean {
+  return (
+    value.length > 0 &&
+    value.trim() === value &&
+    !value.includes("\u0000") &&
+    path.isAbsolute(value)
+  );
+}
+
 interface ModulePackageData {
   name: string;
   version: string;
@@ -695,6 +722,13 @@ export async function discoverModules(
       });
     }
   }
+  if (options.modulesDirectoryRequired && !isUsableModulesDirectoryPath(options.modulesDirectory)) {
+    issues.push({
+      code: "MODULES_DIRECTORY_INVALID",
+      message: MODULES_DIRECTORY_INVALID_MESSAGE,
+      moduleDirectory: ".",
+    });
+  }
   if (issues.length > 0) {
     throw new ModuleDiscoveryError(issues);
   }
@@ -703,7 +737,7 @@ export async function discoverModules(
   try {
     directoryEntries = await readdir(options.modulesDirectory, { withFileTypes: true });
   } catch (error) {
-    if (errorCode(error) === "ENOENT") {
+    if (errorCode(error) === "ENOENT" && !options.modulesDirectoryRequired) {
       return Object.freeze([]);
     }
     throw new ModuleDiscoveryError([

core/src/modules/index.ts

@@ -2,11 +2,15 @@ export * from "./configuration.js";
 export * from "./configuration-schema.js";
 export * from "./configuration-store.js";
 export * from "./database.js";
+export * from "./database-abi.js";
 export * from "./discovery.js";
 export * from "./lifecycle.js";
 export * from "./lifecycle-schema.js";
 export * from "./lifecycle-store.js";
 export * from "./migration-discovery.js";
+export * from "./modules-directory.js";
+export * from "./module-package-host.js";
+export * from "./module-package-verification.js";
 export * from "./permissions.js";
 export * from "./realtime.js";
 export * from "./runtime.js";

core/src/modules/legacy-schema-definition.ts

@@ -1,19 +1,15 @@
+/**
+ * The legacy module schema definition (ADR 0007): a v8 module that declares no `database` default-
+ * exports `{ moduleId, tables }` with its Drizzle table objects themselves. Core alone validates it,
+ * for the legacy facade's deprecation window (ADR 0050). It lives here, beside Core's own Drizzle
+ * dependency, so that no package a module installs needs Drizzle at run time (ADR 0053).
+ *
+ * Erasable TypeScript with no relative imports: the verifier's probe imports this source file
+ * directly in tests (`module-package-probe.ts`).
+ */
 import { is } from "drizzle-orm";
 import { type AnyPgTable, PgTable } from "drizzle-orm/pg-core";
-import { z } from "zod";
+import { type ModuleId, moduleIdSchema } from "@ekklesia/contracts";
-import { type ModuleId, moduleIdSchema } from "./identifiers.js";
-
-export const POSTGRES_IDENTIFIER_MAX_LENGTH = 63;
-
-export const moduleTableLocalNameSchema = z
-  .string()
-  .min(1)
-  .regex(/^[a-z][a-z0-9]*(?:_[a-z0-9]+)*$/u, "Must be a lowercase snake-case table name.");
-
-export const physicalModuleTableNameSchema = moduleTableLocalNameSchema.max(
-  POSTGRES_IDENTIFIER_MAX_LENGTH,
-  `Must not exceed ${POSTGRES_IDENTIFIER_MAX_LENGTH} characters.`,
-);
 
 export interface ModuleSchemaDefinition<
   Tables extends Readonly<Record<string, AnyPgTable>> = Readonly<Record<string, AnyPgTable>>,
@@ -35,23 +31,6 @@ function hasOnlyStringKeys(value: object, allowedKeys?: ReadonlySet<string>): bo
   );
 }
 
-export function moduleTableNamespace(moduleId: ModuleId): string {
-  return moduleIdSchema.parse(moduleId).replaceAll("-", "_");
-}
-
-export function moduleTablePrefix(moduleId: ModuleId): string {
-  return `${moduleTableNamespace(moduleId)}_`;
-}
-
-export function moduleTableName(moduleId: ModuleId, localName: string): string {
-  const parsedLocalName = moduleTableLocalNameSchema.parse(localName);
-  const tableName = `${moduleTablePrefix(moduleId)}${parsedLocalName}`;
-  if (!physicalModuleTableNameSchema.safeParse(tableName).success) {
-    throw new RangeError("The namespaced PostgreSQL table name is invalid or too long.");
-  }
-  return tableName;
-}
-
 export function isModuleSchemaDefinition(value: unknown): value is ModuleSchemaDefinition {
   try {
     if (

core/src/modules/module-package-archive.ts

@@ -0,0 +1,203 @@
+import { gunzipSync } from "node:zlib";
+
+/**
+ * Reads an Ekklesia Module Package v1 archive (ADR 0049) entirely in memory and enforces the
+ * archive-safety rules before anything is written anywhere.
+ *
+ * Deliberately a strict reader rather than a general tar implementation: v1 packages hold only
+ * POSIX ustar directories and regular files, so every other entry type is refused instead of
+ * interpreted. Nothing here touches the filesystem; extraction happens only after the caller has
+ * verified the whole package.
+ */
+
+export type ModulePackageArchiveErrorCode =
+  | "MODULE_PACKAGE_LAYOUT_INVALID"
+  | "MODULE_PACKAGE_LINK"
+  | "MODULE_PACKAGE_SPECIAL_ENTRY"
+  | "MODULE_PACKAGE_TOO_LARGE"
+  | "MODULE_PACKAGE_UNREADABLE"
+  | "MODULE_PACKAGE_UNSAFE_MODE"
+  | "MODULE_PACKAGE_UNSAFE_PATH";
+
+export class ModulePackageArchiveError extends Error {
+  readonly code: ModulePackageArchiveErrorCode;
+
+  constructor(code: ModulePackageArchiveErrorCode) {
+    super(code);
+    this.name = "ModulePackageArchiveError";
+    this.code = code;
+  }
+}
+
+/** Generous for a module, small enough that a hostile archive cannot exhaust the host. */
+export const MODULE_PACKAGE_MAX_COMPRESSED_BYTES = 256 * 1024 * 1024;
+export const MODULE_PACKAGE_MAX_UNCOMPRESSED_BYTES = 1024 * 1024 * 1024;
+export const MODULE_PACKAGE_MAX_ENTRIES = 100_000;
+
+export interface ModulePackageArchiveEntry {
+  /** Relative to the top-level module directory; empty for that directory itself. */
+  readonly path: string;
+  readonly type: "directory" | "file";
+  readonly data: Buffer;
+}
+
+export interface ModulePackageArchive {
+  /** The single top-level directory's name. Validated as a module id by the caller. */
+  readonly topLevel: string;
+  /** Every entry except the top-level directory itself, in archive order. */
+  readonly entries: readonly ModulePackageArchiveEntry[];
+}
+
+const BLOCK = 512;
+
+function field(block: Buffer, offset: number, length: number): string {
+  const raw = block.subarray(offset, offset + length);
+  const end = raw.indexOf(0);
+  return raw.subarray(0, end === -1 ? length : end).toString("latin1");
+}
+
+function octalField(block: Buffer, offset: number, length: number): number {
+  const text = field(block, offset, length).trim();
+  if (!/^[0-7]+$/u.test(text)) {
+    throw new ModulePackageArchiveError("MODULE_PACKAGE_UNREADABLE");
+  }
+  const value = Number.parseInt(text, 8);
+  if (!Number.isSafeInteger(value)) {
+    throw new ModulePackageArchiveError("MODULE_PACKAGE_UNREADABLE");
+  }
+  return value;
+}
+
+function headerChecksumValid(block: Buffer): boolean {
+  const declared = octalField(block, 148, 8);
+  let sum = 0;
+  for (let index = 0; index < BLOCK; index += 1) {
+    sum += index >= 148 && index < 156 ? 0x20 : (block[index] ?? 0);
+  }
+  return sum === declared;
+}
+
+/** Printable ASCII, no backslash, relative, and no empty, `.`, or `..` segment. */
+function safeSegments(value: string): readonly string[] {
+  if (
+    value.length === 0 ||
+    !/^[\x20-\x7e]+$/u.test(value) ||
+    value.includes("\\") ||
+    value.startsWith("/")
+  ) {
+    throw new ModulePackageArchiveError("MODULE_PACKAGE_UNSAFE_PATH");
+  }
+  const segments = value.split("/");
+  if (segments.some((segment) => segment === "" || segment === "." || segment === "..")) {
+    throw new ModulePackageArchiveError("MODULE_PACKAGE_UNSAFE_PATH");
+  }
+  return segments;
+}
+
+export function readModulePackageArchive(compressed: Buffer): ModulePackageArchive {
+  if (compressed.length > MODULE_PACKAGE_MAX_COMPRESSED_BYTES) {
+    throw new ModulePackageArchiveError("MODULE_PACKAGE_TOO_LARGE");
+  }
+  let raw: Buffer;
+  try {
+    raw = gunzipSync(compressed, { maxOutputLength: MODULE_PACKAGE_MAX_UNCOMPRESSED_BYTES });
+  } catch (error) {
+    throw new ModulePackageArchiveError(
+      error instanceof RangeError ? "MODULE_PACKAGE_TOO_LARGE" : "MODULE_PACKAGE_UNREADABLE",
+    );
+  }
+
+  const entries: ModulePackageArchiveEntry[] = [];
+  const kinds = new Map<string, "directory" | "file">();
+  /** Every path that is an ancestor of some entry, so a file can never claim one. */
+  const ancestors = new Set<string>();
+  let topLevel: string | undefined;
+  let offset = 0;
+  let ended = false;
+
+  while (offset + BLOCK <= raw.length) {
+    const block = raw.subarray(offset, offset + BLOCK);
+    if (block.every((byte) => byte === 0)) {
+      ended = true;
+      break;
+    }
+    if (field(block, 257, 6) !== "ustar" || field(block, 263, 2) !== "00") {
+      throw new ModulePackageArchiveError("MODULE_PACKAGE_UNREADABLE");
+    }
+    if (!headerChecksumValid(block)) {
+      throw new ModulePackageArchiveError("MODULE_PACKAGE_UNREADABLE");
+    }
+    if (entries.length + 1 > MODULE_PACKAGE_MAX_ENTRIES) {
+      throw new ModulePackageArchiveError("MODULE_PACKAGE_TOO_LARGE");
+    }
+
+    const typeflag = field(block, 156, 1);
+    if (typeflag === "1" || typeflag === "2") {
+      throw new ModulePackageArchiveError("MODULE_PACKAGE_LINK");
+    }
+    const type =
+      typeflag === "5" ? "directory" : typeflag === "0" || typeflag === "" ? "file" : undefined;
+    if (type === undefined) {
+      // Devices, FIFOs, contiguous files, and every extended or long-name header: v1 packages hold
+      // directories and regular files, so nothing else is interpreted.
+      throw new ModulePackageArchiveError("MODULE_PACKAGE_SPECIAL_ENTRY");
+    }
+
+    const mode = octalField(block, 100, 8);
+    if ((mode & 0o7000) !== 0) {
+      throw new ModulePackageArchiveError("MODULE_PACKAGE_UNSAFE_MODE");
+    }
+
+    const name = field(block, 0, 100);
+    const prefix = field(block, 345, 155);
+    let fullPath = prefix === "" ? name : `${prefix}/${name}`;
+    if (type === "directory" && fullPath.endsWith("/")) {
+      fullPath = fullPath.slice(0, -1);
+    }
+    const segments = safeSegments(fullPath);
+    const top = segments[0] ?? "";
+    if (topLevel === undefined) {
+      topLevel = top;
+    } else if (top !== topLevel) {
+      throw new ModulePackageArchiveError("MODULE_PACKAGE_LAYOUT_INVALID");
+    }
+
+    const size = type === "file" ? octalField(block, 124, 12) : 0;
+    const dataStart = offset + BLOCK;
+    const dataEnd = dataStart + size;
+    if (dataEnd > raw.length) {
+      throw new ModulePackageArchiveError("MODULE_PACKAGE_UNREADABLE");
+    }
+    const relative = segments.slice(1).join("/");
+
+    if (relative === "") {
+      if (type !== "directory") {
+        throw new ModulePackageArchiveError("MODULE_PACKAGE_LAYOUT_INVALID");
+      }
+    } else {
+      if (kinds.has(relative)) {
+        throw new ModulePackageArchiveError("MODULE_PACKAGE_LAYOUT_INVALID");
+      }
+      // No entry may sit below a file, and no file may claim a path something already sits below.
+      // Linear in the total number of path segments, whatever order the entries arrive in.
+      if (type === "file" && ancestors.has(relative)) {
+        throw new ModulePackageArchiveError("MODULE_PACKAGE_LAYOUT_INVALID");
+      }
+      for (let index = 1; index < segments.length - 1; index += 1) {
+        const ancestor = segments.slice(1, index + 1).join("/");
+        if (kinds.get(ancestor) === "file") {
+          throw new ModulePackageArchiveError("MODULE_PACKAGE_LAYOUT_INVALID");
+        }
+        ancestors.add(ancestor);
+      }
+      kinds.set(relative, type);
+      entries.push({ data: Buffer.from(raw.subarray(dataStart, dataEnd)), path: relative, type });
+    }
+    offset = dataStart + Math.ceil(size / BLOCK) * BLOCK;
+  }
+
+  if (!ended || topLevel === undefined) {
+    throw new ModulePackageArchiveError("MODULE_PACKAGE_UNREADABLE");
+  }
+  return Object.freeze({ entries: Object.freeze(entries), topLevel });
+}

core/src/modules/module-package-host.ts

@@ -0,0 +1,59 @@
+/**
+ * The facts about this host that decide whether a native Module Package v1 can run on it
+ * (ADR 0049): operating system, CPU, C library family and version, and Node-API version.
+ *
+ * Everything comes from Node.js itself (`process.platform`, `process.arch`, `process.versions`, and
+ * the diagnostic report's `glibcVersionRuntime`), never from running a system command. A fact Node
+ * cannot report is left undefined, and every check that needs it fails closed.
+ */
+export interface ModulePackageHost {
+  readonly platform: string;
+  readonly arch: string;
+  /** The C library on Linux: glibc with its runtime version, or undefined when it cannot be proven
+   * to be glibc (musl reports none). */
+  readonly libc?: { readonly family: "glibc"; readonly version: string };
+  /** `process.versions.napi`: the highest Node-API version this Node.js provides. */
+  readonly nodeApi?: number;
+  /** `process.versions.modules`: the ABI an ABI-specific addon must have been built for. */
+  readonly nodeAbi?: string;
+}
+
+function glibcVersion(): string | undefined {
+  try {
+    const header = (process.report?.getReport() as { header?: { glibcVersionRuntime?: unknown } })
+      ?.header;
+    const version = header?.glibcVersionRuntime;
+    return typeof version === "string" && /^\d+\.\d+(?:\.\d+)?$/u.test(version)
+      ? version
+      : undefined;
+  } catch {
+    return undefined;
+  }
+}
+
+export function currentModulePackageHost(): ModulePackageHost {
+  const libc = process.platform === "linux" ? glibcVersion() : undefined;
+  const nodeApi = Number(process.versions.napi);
+  return Object.freeze({
+    arch: process.arch,
+    ...(libc === undefined
+      ? {}
+      : { libc: Object.freeze({ family: "glibc" as const, version: libc }) }),
+    ...(Number.isInteger(nodeApi) && nodeApi > 0 ? { nodeApi } : {}),
+    ...(typeof process.versions.modules === "string" ? { nodeAbi: process.versions.modules } : {}),
+    platform: process.platform,
+  });
+}
+
+/** The native targets this platform can verify, with what each requires of a host. */
+export const MODULE_PACKAGE_NATIVE_TARGETS: ReadonlyMap<
+  string,
+  {
+    readonly platform: string;
+    readonly arch: string;
+    readonly libc: "glibc";
+    readonly elfMachine: number;
+  }
+> = new Map([
+  ["linux-x64-glibc", { arch: "x64", elfMachine: 62, libc: "glibc", platform: "linux" }],
+]);

core/src/modules/module-package-probe.ts

@@ -0,0 +1,101 @@
+// The isolated, short-lived validation process of Module Package v1 verification (ADR 0049).
+//
+// The verifier forks this file with an empty environment and one JSON argument naming a candidate
+// module's backend entrypoints. It imports each one, so a package whose code cannot load, or whose
+// bundle still reaches for a dependency it does not contain, is refused before it is ever installed.
+// Whatever the module's top-level code does happens here, in a process with no database URL, no
+// secret, and no platform state, and that is discarded as soon as it reports.
+//
+// The result travels over the IPC channel, never stdout, so nothing a module prints can forge it.
+// It carries fixed role and reason names only: never an error message, a path, or module output.
+//
+// Written as erasable TypeScript, so Node can run the source file directly in tests as well as the
+// compiled file in the image. Its one relative import names the source file's own extension, which
+// the build rewrites to `.js` (`rewriteRelativeImportExtensions`); that file follows the same rules.
+import { pathToFileURL } from "node:url";
+import {
+  parseModuleRuntimeDefinition,
+  parseModuleSchemaMetadataDefinition,
+} from "@ekklesia/contracts";
+import { parseModuleSchemaDefinition } from "./legacy-schema-definition.ts";
+
+interface ProbeRequest {
+  readonly databaseAbi?: 1;
+  readonly moduleId: string;
+  readonly version: string;
+  readonly entrypoints: Readonly<Record<string, string>>;
+}
+
+interface ProbeFailure {
+  readonly role: string;
+  readonly reason: "contract" | "export" | "identity" | "load";
+}
+
+function defaultExport(namespace: unknown): unknown {
+  return typeof namespace === "object" && namespace !== null && "default" in namespace
+    ? (namespace as { default: unknown }).default
+    : undefined;
+}
+
+async function probe(request: ProbeRequest): Promise<readonly ProbeFailure[]> {
+  const failures: ProbeFailure[] = [];
+  for (const role of Object.keys(request.entrypoints).sort()) {
+    const entrypoint = request.entrypoints[role];
+    if (entrypoint === undefined) {
+      continue;
+    }
+    let namespace: unknown;
+    try {
+      namespace = await import(pathToFileURL(entrypoint).href);
+    } catch {
+      failures.push({ reason: "load", role });
+      continue;
+    }
+    try {
+      if (role === "server") {
+        const definition = parseModuleRuntimeDefinition(defaultExport(namespace));
+        if (definition.id !== request.moduleId || definition.version !== request.version) {
+          failures.push({ reason: "identity", role });
+        }
+        if ((definition.database?.abi === 1) !== (request.databaseAbi === 1)) {
+          failures.push({ reason: "contract", role });
+        }
+      } else if (role === "schema") {
+        const definition =
+          request.databaseAbi === 1
+            ? parseModuleSchemaMetadataDefinition(defaultExport(namespace))
+            : parseModuleSchemaDefinition(defaultExport(namespace));
+        if (definition.moduleId !== request.moduleId) {
+          failures.push({ reason: "identity", role });
+        }
+      }
+    } catch {
+      failures.push({ reason: "export", role });
+    }
+  }
+  return failures;
+}
+
+function report(message: unknown): void {
+  if (typeof process.send !== "function") {
+    process.exitCode = 2;
+    return;
+  }
+  process.send(message, () => {
+    // A module may leave timers or handles behind; the probe's work is done either way.
+    process.exit(0);
+  });
+}
+
+let request: ProbeRequest | undefined;
+try {
+  request = JSON.parse(process.argv[2] ?? "") as ProbeRequest;
+} catch {
+  report({ failures: [{ reason: "load", role: "request" }] });
+}
+if (request !== undefined) {
+  probe(request).then(
+    (failures) => report({ failures }),
+    () => report({ failures: [{ reason: "load", role: "probe" }] }),
+  );
+}

core/src/modules/module-package-verification.ts

@@ -0,0 +1,650 @@
+import { fork } from "node:child_process";
+import { createHash } from "node:crypto";
+import { chmod, mkdir, mkdtemp, readFile, realpath, rm, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import {
+  isVersionCompatible,
+  type ModuleManifest,
+  safeParseModuleManifest,
+} from "@ekklesia/contracts";
+import {
+  MODULE_PACKAGE_ANY_TARGET,
+  MODULE_PACKAGE_FORMAT,
+  MODULE_PACKAGE_METADATA_FILENAME,
+  type ModulePackageMetadata,
+  safeParseModulePackageMetadata,
+  safeParseModulePackageRuntimePackage,
+} from "@ekklesia/contracts/module-package";
+import { discoverModules, MODULE_MANIFEST_FILENAME, ModuleDiscoveryError } from "./discovery.js";
+import {
+  currentModulePackageHost,
+  MODULE_PACKAGE_NATIVE_TARGETS,
+  type ModulePackageHost,
+} from "./module-package-host.js";
+import { discoverModuleMigrations, ModuleMigrationDiscoveryError } from "./migration-discovery.js";
+import {
+  type ModulePackageArchive,
+  ModulePackageArchiveError,
+  type ModulePackageArchiveErrorCode,
+  readModulePackageArchive,
+} from "./module-package-archive.js";
+import { discoverModuleSchemas, ModuleSchemaDiscoveryError } from "./schema-discovery.js";
+
+/**
+ * Verifies an Ekklesia Module Package v1 archive (ADR 0049) against the platform it runs on, without
+ * ever installing it.
+ *
+ * Order matters: everything that can be decided from bytes is decided before anything is written,
+ * and nothing is executed until the package has proven itself well-formed. The archive is read and
+ * checked for safety in memory; its metadata, every payload digest, and every identity statement
+ * are checked next; only then is it written to a fresh temporary directory, validated by the same
+ * discovery the platform uses, and its backend loaded once in a separate, short-lived process with
+ * an empty environment. A caller that asks for extraction gets the verified tree written to a new
+ * directory only after all of that succeeded.
+ *
+ * Errors carry a stable code and a fixed message. Paths, archive entry names, file contents, module
+ * output, and exception messages never appear in them: an archive is untrusted input, and none of
+ * it is ever echoed.
+ */
+
+export type ModulePackageVerificationErrorCode =
+  | ModulePackageArchiveErrorCode
+  | "MODULE_PACKAGE_DATABASE_RUNTIME_INCOMPATIBLE"
+  | "MODULE_PACKAGE_DATABASE_RUNTIME_UNEXPECTED"
+  | "MODULE_PACKAGE_DIGEST_MISMATCH"
+  | "MODULE_PACKAGE_ENTRYPOINT_LOAD_FAILED"
+  | "MODULE_PACKAGE_EXTRACTION_FAILED"
+  | "MODULE_PACKAGE_FILE_MISMATCH"
+  | "MODULE_PACKAGE_FILE_MISSING"
+  | "MODULE_PACKAGE_FILE_UNLISTED"
+  | "MODULE_PACKAGE_FORMAT_UNSUPPORTED"
+  | "MODULE_PACKAGE_IDENTITY_MISMATCH"
+  | "MODULE_PACKAGE_LIBC_INCOMPATIBLE"
+  | "MODULE_PACKAGE_MANIFEST_INVALID"
+  | "MODULE_PACKAGE_METADATA_INVALID"
+  | "MODULE_PACKAGE_METADATA_MISSING"
+  | "MODULE_PACKAGE_MODULE_INVALID"
+  | "MODULE_PACKAGE_NATIVE_FILE"
+  | "MODULE_PACKAGE_NATIVE_FILE_INCOMPATIBLE"
+  | "MODULE_PACKAGE_NODE_API_INCOMPATIBLE"
+  | "MODULE_PACKAGE_RUNTIME_INCOMPATIBLE"
+  | "MODULE_PACKAGE_RUNTIME_PACKAGE_INVALID"
+  | "MODULE_PACKAGE_SDK_INCOMPATIBLE"
+  | "MODULE_PACKAGE_TARGET_INCOMPATIBLE"
+  | "MODULE_PACKAGE_TRANSITIONAL_UNSUPPORTED"
+  | "MODULE_PACKAGE_VERIFIER_SCRATCH_UNAVAILABLE";
+
+const messages: Readonly<Record<ModulePackageVerificationErrorCode, string>> = Object.freeze({
+  MODULE_PACKAGE_DATABASE_RUNTIME_INCOMPATIBLE:
+    "The package's bundled database runtime does not match this platform's (a transitional constraint).",
+  MODULE_PACKAGE_DATABASE_RUNTIME_UNEXPECTED:
+    "A Module Database ABI package must not carry a transitional database runtime.",
+  MODULE_PACKAGE_DIGEST_MISMATCH: "The archive does not match the SHA-256 it was given.",
+  MODULE_PACKAGE_ENTRYPOINT_LOAD_FAILED:
+    "A backend entrypoint could not be loaded from the package alone.",
+  MODULE_PACKAGE_EXTRACTION_FAILED:
+    "The verified package could not be extracted to a new directory.",
+  MODULE_PACKAGE_FILE_MISMATCH: "A payload file does not match its listed size or SHA-256.",
+  MODULE_PACKAGE_FILE_MISSING: "A file listed in the package metadata is missing from the archive.",
+  MODULE_PACKAGE_FILE_UNLISTED: "The archive contains a file the package metadata does not list.",
+  MODULE_PACKAGE_FORMAT_UNSUPPORTED: "The package format is not one this platform implements.",
+  MODULE_PACKAGE_IDENTITY_MISMATCH:
+    "The package metadata, runtime package.json, and manifest disagree about the module's identity.",
+  MODULE_PACKAGE_LAYOUT_INVALID:
+    "The archive must contain exactly one top-level module directory, with each path once.",
+  MODULE_PACKAGE_LIBC_INCOMPATIBLE:
+    "The package needs a newer C library than this host provides, or one it cannot establish.",
+  MODULE_PACKAGE_LINK: "The archive contains a link; module packages may contain none.",
+  MODULE_PACKAGE_MANIFEST_INVALID: "The package's module manifest is missing or invalid.",
+  MODULE_PACKAGE_METADATA_INVALID: "The package metadata is invalid.",
+  MODULE_PACKAGE_METADATA_MISSING: "The archive contains no package metadata.",
+  MODULE_PACKAGE_MODULE_INVALID: "The packaged module failed module validation.",
+  MODULE_PACKAGE_NATIVE_FILE:
+    "An any-target package contains a native file or a node_modules directory.",
+  MODULE_PACKAGE_NATIVE_FILE_INCOMPATIBLE:
+    "A native file in the package is not built for the package's target.",
+  MODULE_PACKAGE_NODE_API_INCOMPATIBLE:
+    "The package's addons need a Node-API version or Node.js ABI this host does not provide.",
+  MODULE_PACKAGE_RUNTIME_INCOMPATIBLE:
+    "The package needs a Node.js version this host does not run.",
+  MODULE_PACKAGE_RUNTIME_PACKAGE_INVALID:
+    "The package's runtime package.json is not the generated runtime shape.",
+  MODULE_PACKAGE_SDK_INCOMPATIBLE:
+    "The Module SDK bundled into the package is outside the manifest's own moduleSdk range.",
+  MODULE_PACKAGE_SPECIAL_ENTRY:
+    "The archive contains an entry that is neither a directory nor a regular file.",
+  MODULE_PACKAGE_TARGET_INCOMPATIBLE: "The package's target is not one this platform can run.",
+  MODULE_PACKAGE_TOO_LARGE: "The archive exceeds the module package size limits.",
+  MODULE_PACKAGE_TRANSITIONAL_UNSUPPORTED:
+    "The package metadata contains transitional facts this platform does not understand.",
+  MODULE_PACKAGE_VERIFIER_SCRATCH_UNAVAILABLE:
+    "The verifier execution scratch directory is missing, not writable, or mounted noexec.",
+  MODULE_PACKAGE_UNREADABLE: "The file is not a readable gzip-compressed ustar archive.",
+  MODULE_PACKAGE_UNSAFE_MODE: "The archive contains a setuid, setgid, or sticky entry.",
+  MODULE_PACKAGE_UNSAFE_PATH: "The archive contains an absolute, escaping, or non-portable path.",
+});
+
+export class ModulePackageVerificationError extends Error {
+  readonly code: ModulePackageVerificationErrorCode;
+  /** Stable discovery issue codes, when module validation failed; never their messages. */
+  readonly issueCodes: readonly string[];
+
+  constructor(code: ModulePackageVerificationErrorCode, issueCodes: readonly string[] = []) {
+    super(messages[code]);
+    this.name = "ModulePackageVerificationError";
+    this.code = code;
+    this.issueCodes = Object.freeze([...new Set(issueCodes)].sort());
+    this.stack = `${this.name}: ${this.message}`;
+    Object.freeze(this);
+  }
+}
+
+/** What this platform is, for the checks that compare a package against it. */
+export interface ModulePackagePlatform {
+  readonly platformVersion: string;
+  readonly moduleSdkVersion: string;
+  /** The transitional database runtime facts this platform requires a package to agree with. */
+  readonly databaseRuntime: Readonly<Record<string, string>>;
+  /** Defaults to the running process's Node.js version. */
+  readonly nodeVersion?: string;
+  /** Defaults to this process's own host (`currentModulePackageHost`). */
+  readonly host?: ModulePackageHost;
+}
+
+export interface VerifyModulePackageOptions {
+  readonly archivePath: string;
+  /** When given, the archive's SHA-256 must equal it (lowercase hexadecimal). */
+  readonly expectedSha256?: string;
+  readonly platform: ModulePackagePlatform;
+  /** A directory that must not exist yet; the verified module directory is written there. */
+  readonly extractTo?: string;
+  /**
+   * Existing writable directory where backend candidates may execute. Defaults to `os.tmpdir()`.
+   * A hardened caller whose system temporary directory is `noexec` must provide a dedicated
+   * executable scratch mount; each verification creates and removes its own child directory.
+   */
+  readonly executionScratchDirectory?: string;
+  readonly loadTimeoutMs?: number;
+}
+
+export interface ModulePackageVerificationResult {
+  readonly archiveSha256: string;
+  /** Payload files, the metadata file not included. */
+  readonly fileCount: number;
+  readonly moduleId: string;
+  readonly target: string;
+  readonly version: string;
+}
+
+function fail(code: ModulePackageVerificationErrorCode, issueCodes?: readonly string[]): never {
+  throw new ModulePackageVerificationError(code, issueCodes);
+}
+
+function sha256(data: Uint8Array): string {
+  return createHash("sha256").update(data).digest("hex");
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+function parseJson(data: Buffer | undefined): unknown {
+  if (data === undefined) {
+    return undefined;
+  }
+  try {
+    return JSON.parse(data.toString("utf8")) as unknown;
+  } catch {
+    return undefined;
+  }
+}
+
+/** The transitional facts this verifier understands, and nothing else (ADR 0049). */
+const UNDERSTOOD_TRANSITIONAL: Readonly<Record<string, readonly string[]>> = Object.freeze({
+  databaseRuntime: Object.freeze(["drizzle-orm"]),
+});
+
+function checkTransitional(raw: Record<string, unknown>): void {
+  const transitional = raw.transitional;
+  if (transitional === undefined) {
+    return;
+  }
+  if (!isRecord(transitional)) {
+    fail("MODULE_PACKAGE_TRANSITIONAL_UNSUPPORTED");
+  }
+  for (const [key, value] of Object.entries(transitional)) {
+    const understood = UNDERSTOOD_TRANSITIONAL[key];
+    if (!understood || !isRecord(value)) {
+      fail("MODULE_PACKAGE_TRANSITIONAL_UNSUPPORTED");
+    }
+    if (Object.keys(value).some((name) => !understood.includes(name))) {
+      fail("MODULE_PACKAGE_TRANSITIONAL_UNSUPPORTED");
+    }
+  }
+}
+
+function readMetadata(files: ReadonlyMap<string, Buffer>): ModulePackageMetadata {
+  const raw = parseJson(files.get(MODULE_PACKAGE_METADATA_FILENAME));
+  if (!files.has(MODULE_PACKAGE_METADATA_FILENAME)) {
+    fail("MODULE_PACKAGE_METADATA_MISSING");
+  }
+  if (!isRecord(raw)) {
+    fail("MODULE_PACKAGE_METADATA_INVALID");
+  }
+  if (raw.packageFormat !== MODULE_PACKAGE_FORMAT) {
+    fail("MODULE_PACKAGE_FORMAT_UNSUPPORTED");
+  }
+  checkTransitional(raw);
+  const parsed = safeParseModulePackageMetadata(raw);
+  if (!parsed.success) {
+    fail("MODULE_PACKAGE_METADATA_INVALID");
+  }
+  return parsed.data;
+}
+
+function checkPayload(metadata: ModulePackageMetadata, files: ReadonlyMap<string, Buffer>): void {
+  const listed = new Set(metadata.files.map((file) => file.path));
+  for (const filePath of files.keys()) {
+    if (filePath !== MODULE_PACKAGE_METADATA_FILENAME && !listed.has(filePath)) {
+      fail("MODULE_PACKAGE_FILE_UNLISTED");
+    }
+  }
+  for (const file of metadata.files) {
+    const data = files.get(file.path);
+    if (data === undefined) {
+      fail("MODULE_PACKAGE_FILE_MISSING");
+    }
+    if (data.length !== file.size || sha256(data) !== file.sha256) {
+      fail("MODULE_PACKAGE_FILE_MISMATCH");
+    }
+  }
+}
+
+function checkIdentity(
+  archive: ModulePackageArchive,
+  metadata: ModulePackageMetadata,
+  files: ReadonlyMap<string, Buffer>,
+): ModuleManifest {
+  const runtimePackage = safeParseModulePackageRuntimePackage(parseJson(files.get("package.json")));
+  if (!runtimePackage.success) {
+    fail("MODULE_PACKAGE_RUNTIME_PACKAGE_INVALID");
+  }
+  const manifest = safeParseModuleManifest(parseJson(files.get(MODULE_MANIFEST_FILENAME)));
+  if (!manifest.success) {
+    fail("MODULE_PACKAGE_MANIFEST_INVALID");
+  }
+  if (
+    archive.topLevel !== metadata.module.id ||
+    manifest.data.id !== metadata.module.id ||
+    manifest.data.version !== metadata.module.version ||
+    runtimePackage.data.version !== metadata.module.version
+  ) {
+    fail("MODULE_PACKAGE_IDENTITY_MISMATCH");
+  }
+  return manifest.data;
+}
+
+function checkCompatibility(
+  metadata: ModulePackageMetadata,
+  manifest: ModuleManifest,
+  files: ReadonlyMap<string, Buffer>,
+  platform: ModulePackagePlatform,
+): void {
+  if (metadata.target === MODULE_PACKAGE_ANY_TARGET) {
+    // An any-target package bundles everything: no addon, no ELF object, no node_modules.
+    for (const [filePath, data] of files) {
+      if (
+        filePath.toLowerCase().endsWith(".node") ||
+        filePath.startsWith("node_modules/") ||
+        isElf(data)
+      ) {
+        fail("MODULE_PACKAGE_NATIVE_FILE");
+      }
+    }
+  } else {
+    checkNativeTarget(metadata, files, platform.host ?? currentModulePackageHost());
+  }
+  if (!isVersionCompatible(platform.nodeVersion ?? process.versions.node, metadata.runtime.node)) {
+    fail("MODULE_PACKAGE_RUNTIME_INCOMPATIBLE");
+  }
+  const sdk = metadata.incorporates["@ekklesia/module-sdk"];
+  if (sdk !== undefined && !isVersionCompatible(sdk, manifest.compatibility.moduleSdk)) {
+    fail("MODULE_PACKAGE_SDK_INCOMPATIBLE");
+  }
+  if (manifest.database?.abi === 1) {
+    if (metadata.transitional?.databaseRuntime !== undefined) {
+      fail("MODULE_PACKAGE_DATABASE_RUNTIME_UNEXPECTED");
+    }
+    return;
+  }
+  // Transitional legacy-v8 path (ADR 0049): Core queries the module's Drizzle tables with its own
+  // Drizzle instance, so a recorded module runtime must match. ABI-v1 packages return above: their
+  // bundled ORM is a private implementation detail and is never compared with Core's.
+  for (const [runtime, version] of Object.entries(metadata.transitional?.databaseRuntime ?? {})) {
+    if (platform.databaseRuntime[runtime] !== version) {
+      fail("MODULE_PACKAGE_DATABASE_RUNTIME_INCOMPATIBLE");
+    }
+  }
+}
+
+function isElf(data: Uint8Array): boolean {
+  return (
+    data.length >= 4 && data[0] === 0x7f && data[1] === 0x45 && data[2] === 0x4c && data[3] === 0x46
+  );
+}
+
+/** `2.41` → `2.41.0`, for comparison against a semantic-version range. */
+function asSemver(version: string): string {
+  const parts = version.split(".");
+  return [...parts, "0", "0"].slice(0, 3).join(".");
+}
+
+/**
+ * A native target (ADR 0049): accepted only for a target this platform implements, on a host that
+ * provably matches it. Platform, CPU, C library family and minimum version, and the Node-API version
+ * or ABI the addons need are all checked; a fact the host cannot establish fails closed. Every ELF
+ * object in the package must be built for the target's machine, and every `.node` addon must be one.
+ */
+function checkNativeTarget(
+  metadata: ModulePackageMetadata,
+  files: ReadonlyMap<string, Buffer>,
+  host: ModulePackageHost,
+): void {
+  const target = MODULE_PACKAGE_NATIVE_TARGETS.get(metadata.target);
+  if (
+    target === undefined ||
+    host.platform !== target.platform ||
+    host.arch !== target.arch ||
+    host.libc?.family !== target.libc
+  ) {
+    fail("MODULE_PACKAGE_TARGET_INCOMPATIBLE");
+  }
+  const required = metadata.runtime.libcVersion;
+  if (
+    required === undefined ||
+    host.libc === undefined ||
+    !isVersionCompatible(asSemver(host.libc.version), required)
+  ) {
+    fail("MODULE_PACKAGE_LIBC_INCOMPATIBLE");
+  }
+  const { nodeAbi, nodeApi } = metadata.runtime;
+  if (
+    (nodeApi === undefined && nodeAbi === undefined) ||
+    (nodeApi !== undefined && (host.nodeApi === undefined || host.nodeApi < nodeApi)) ||
+    (nodeAbi !== undefined && host.nodeAbi !== nodeAbi)
+  ) {
+    fail("MODULE_PACKAGE_NODE_API_INCOMPATIBLE");
+  }
+  for (const [filePath, data] of files) {
+    const addon = filePath.toLowerCase().endsWith(".node");
+    if (!isElf(data)) {
+      if (addon) {
+        fail("MODULE_PACKAGE_NATIVE_FILE_INCOMPATIBLE");
+      }
+      continue;
+    }
+    // ELF64, little-endian, for the target's machine (e_machine at offset 18).
+    if (
+      data.length < 20 ||
+      data[4] !== 2 ||
+      data[5] !== 1 ||
+      data.readUInt16LE(18) !== target.elfMachine
+    ) {
+      fail("MODULE_PACKAGE_NATIVE_FILE_INCOMPATIBLE");
+    }
+  }
+}
+
+/** Writes the archive's directories (`0755`) and files (`0644`) under `root`, which must not exist.
+ * Safe by construction: every path was validated as relative and non-escaping, and only directories
+ * and regular files exist. Ownership is the writing process's, never the archive's. */
+async function writeTree(root: string, archive: ModulePackageArchive): Promise<void> {
+  await mkdir(root, { mode: 0o755 });
+  await chmod(root, 0o755);
+  for (const entry of archive.entries) {
+    const target = path.join(root, ...entry.path.split("/"));
+    if (entry.type === "directory") {
+      await mkdir(target, { mode: 0o755, recursive: true });
+      await chmod(target, 0o755);
+    } else {
+      await mkdir(path.dirname(target), { mode: 0o755, recursive: true });
+      await writeFile(target, entry.data, { flag: "wx", mode: 0o644 });
+      await chmod(target, 0o644);
+    }
+  }
+}
+
+function probeEntrypointPath(): string {
+  // The probe sits beside this file: compiled `.js` in an installation, source `.ts` under a test
+  // runner, which Node runs directly. Either way it is a separate process.
+  const self = fileURLToPath(import.meta.url);
+  return path.join(path.dirname(self), `module-package-probe${path.extname(self)}`);
+}
+
+function decodedMountPath(value: string): string {
+  return value.replace(/\\([0-7]{3})/gu, (_match, octal: string) =>
+    String.fromCharCode(Number.parseInt(octal, 8)),
+  );
+}
+
+/** Linux exposes the effective options of every mount, including a container's tmpfs mounts. A
+ * verifier cannot infer `noexec` from file permissions: native addons are mapped executable rather
+ * than invoked as files. On systems without mountinfo, the load remains the final authority. */
+async function isNoExecMount(directory: string): Promise<boolean> {
+  if (process.platform !== "linux") return false;
+  let mountinfo: string;
+  let canonicalDirectory: string;
+  try {
+    [mountinfo, canonicalDirectory] = await Promise.all([
+      readFile("/proc/self/mountinfo", "utf8"),
+      realpath(directory),
+    ]);
+  } catch {
+    return false;
+  }
+  const mounts = mountinfo
+    .split("\n")
+    .map((line) => line.split(" "))
+    .filter((fields) => fields.length > 6 && fields.includes("-"))
+    .map((fields) => ({
+      mountPoint: decodedMountPath(fields[4] ?? ""),
+      options: (fields[5] ?? "").split(","),
+    }))
+    .filter(
+      ({ mountPoint }) =>
+        canonicalDirectory === mountPoint ||
+        canonicalDirectory.startsWith(mountPoint === "/" ? "/" : `${mountPoint}/`),
+    )
+    .sort((left, right) => right.mountPoint.length - left.mountPoint.length);
+  return mounts[0]?.options.includes("noexec") ?? false;
+}
+
+async function createExecutionScratch(baseDirectory: string): Promise<string> {
+  if (!path.isAbsolute(baseDirectory)) {
+    fail("MODULE_PACKAGE_VERIFIER_SCRATCH_UNAVAILABLE");
+  }
+  try {
+    if (await isNoExecMount(baseDirectory)) {
+      fail("MODULE_PACKAGE_VERIFIER_SCRATCH_UNAVAILABLE");
+    }
+    return await mkdtemp(path.join(baseDirectory, "ekklesia-package-verify-"));
+  } catch (error) {
+    if (error instanceof ModulePackageVerificationError) throw error;
+    fail("MODULE_PACKAGE_VERIFIER_SCRATCH_UNAVAILABLE");
+  }
+}
+
+/** Loads every backend entrypoint in a short-lived child with an empty environment, and reports
+ * only whether each loaded and exported a definition naming this module. */
+async function loadEntrypoints(
+  manifest: Pick<ModuleManifest, "database" | "id" | "version">,
+  entrypoints: Readonly<Record<string, string>>,
+  timeoutMs: number,
+  executionDirectory: string,
+): Promise<void> {
+  const outcome = await new Promise<"ok" | "failed">((resolve) => {
+    let settled = false;
+    let child: ReturnType<typeof fork> | undefined;
+    let timer: ReturnType<typeof setTimeout> | undefined;
+    const finish = (value: "ok" | "failed"): void => {
+      if (!settled) {
+        settled = true;
+        clearTimeout(timer);
+        child?.kill("SIGKILL");
+        resolve(value);
+      }
+    };
+    try {
+      child = fork(
+        probeEntrypointPath(),
+        [
+          JSON.stringify({
+            ...(manifest.database?.abi === 1 ? { databaseAbi: 1 } : {}),
+            entrypoints,
+            moduleId: manifest.id,
+            version: manifest.version,
+          }),
+        ],
+        {
+          cwd: executionDirectory,
+          env: {},
+          execArgv: [],
+          serialization: "json",
+          stdio: ["ignore", "ignore", "ignore", "ipc"],
+        },
+      );
+    } catch {
+      finish("failed");
+      return;
+    }
+    timer = setTimeout(() => finish("failed"), timeoutMs);
+    child.on("message", (message: unknown) => {
+      const failures = isRecord(message) ? message.failures : undefined;
+      finish(Array.isArray(failures) && failures.length === 0 ? "ok" : "failed");
+    });
+    child.on("error", () => finish("failed"));
+    child.on("exit", () => finish("failed"));
+  });
+  if (outcome !== "ok") {
+    fail("MODULE_PACKAGE_ENTRYPOINT_LOAD_FAILED");
+  }
+}
+
+function discoveryIssueCodes(error: unknown): readonly string[] {
+  if (
+    error instanceof ModuleDiscoveryError ||
+    error instanceof ModuleMigrationDiscoveryError ||
+    error instanceof ModuleSchemaDiscoveryError
+  ) {
+    return error.issues.map((issue) => issue.code);
+  }
+  return [];
+}
+
+export async function verifyModulePackage(
+  options: VerifyModulePackageOptions,
+): Promise<ModulePackageVerificationResult> {
+  let compressed: Buffer;
+  try {
+    compressed = await readFile(options.archivePath);
+  } catch {
+    fail("MODULE_PACKAGE_UNREADABLE");
+  }
+  const archiveSha256 = sha256(compressed);
+  if (options.expectedSha256 !== undefined && options.expectedSha256 !== archiveSha256) {
+    fail("MODULE_PACKAGE_DIGEST_MISMATCH");
+  }
+
+  let archive: ModulePackageArchive;
+  try {
+    archive = readModulePackageArchive(compressed);
+  } catch (error) {
+    if (error instanceof ModulePackageArchiveError) {
+      fail(error.code);
+    }
+    fail("MODULE_PACKAGE_UNREADABLE");
+  }
+  const files = new Map(
+    archive.entries
+      .filter((entry) => entry.type === "file")
+      .map((entry) => [entry.path, entry.data] as const),
+  );
+
+  const metadata = readMetadata(files);
+  checkPayload(metadata, files);
+  const manifest = checkIdentity(archive, metadata, files);
+  checkCompatibility(metadata, manifest, files, options.platform);
+
+  const scratch = await createExecutionScratch(options.executionScratchDirectory ?? tmpdir());
+  try {
+    // The candidate alone, in a scratch inventory of its own: never module storage.
+    const modulesDirectory = path.join(scratch, "candidates");
+    await mkdir(modulesDirectory, { mode: 0o755 });
+    await writeTree(path.join(modulesDirectory, metadata.module.id), archive);
+
+    const discoveryOptions = {
+      moduleSdkVersion: options.platform.moduleSdkVersion,
+      modulesDirectory,
+      modulesDirectoryRequired: true,
+      platformVersion: options.platform.platformVersion,
+    } as const;
+    let entrypoints: Record<string, string>;
+    try {
+      // The same static validation the platform runs, against this package alone. A module that
+      // requires another module is validated with its dependencies when it is installed.
+      const [discovered] = await discoverModules(discoveryOptions);
+      if (discovered === undefined) {
+        fail("MODULE_PACKAGE_MODULE_INVALID");
+      }
+      await discoverModuleMigrations(discoveryOptions);
+      entrypoints = {
+        server: discovered.entrypoints.server,
+        ...(discovered.entrypoints.schema ? { schema: discovered.entrypoints.schema } : {}),
+        ...(discovered.entrypoints.jobs ? { jobs: discovered.entrypoints.jobs } : {}),
+      };
+    } catch (error) {
+      if (error instanceof ModulePackageVerificationError) {
+        throw error;
+      }
+      fail("MODULE_PACKAGE_MODULE_INVALID", discoveryIssueCodes(error));
+    }
+
+    // Executed only now, and first in isolation: a schema is imported in this process below only
+    // after the probe proved it loads on its own.
+    await loadEntrypoints(manifest, entrypoints, options.loadTimeoutMs ?? 30_000, scratch);
+    try {
+      await discoverModuleSchemas(discoveryOptions);
+    } catch (error) {
+      fail("MODULE_PACKAGE_MODULE_INVALID", discoveryIssueCodes(error));
+    }
+
+    if (options.extractTo !== undefined) {
+      const extractTo = options.extractTo;
+      let created = false;
+      try {
+        await mkdir(extractTo, { mode: 0o755 });
+        created = true;
+        await rm(extractTo, { recursive: true });
+        await writeTree(extractTo, archive);
+      } catch {
+        // Never leave a partial module directory behind; never remove one this call did not create.
+        if (created) {
+          await rm(extractTo, { force: true, recursive: true }).catch(() => undefined);
+        }
+        fail("MODULE_PACKAGE_EXTRACTION_FAILED");
+      }
+    }
+  } finally {
+    await rm(scratch, { force: true, recursive: true });
+  }
+
+  return Object.freeze({
+    archiveSha256,
+    fileCount: metadata.files.length,
+    moduleId: metadata.module.id,
+    target: metadata.target,
+    version: metadata.module.version,
+  });
+}

core/src/modules/modules-directory.ts

@@ -0,0 +1,66 @@
+import path from "node:path";
+import {
+  isUsableModulesDirectoryPath,
+  MODULES_DIRECTORY_INVALID_MESSAGE,
+  ModuleDiscoveryError,
+} from "./discovery.js";
+
+/** The host environment variable that selects the installed-modules directory (ADR 0048). */
+export const MODULES_DIRECTORY_ENVIRONMENT_VARIABLE = "EKKLESIA_MODULES_DIR";
+
+export interface ResolveModulesDirectoryOptions {
+  /** The raw configured value, exactly as the host environment supplied it; `undefined` when the
+   * variable is unset. */
+  readonly configured: string | undefined;
+  /** Where the platform itself is installed. Only consulted for the development default. */
+  readonly repositoryRoot: string;
+}
+
+/** Spreads directly into `ModuleDiscoveryOptions`, so every consumer discovers through the same
+ * selection, including whether a missing directory is an error. */
+export interface ModulesDirectorySelection {
+  readonly modulesDirectory: string;
+  readonly modulesDirectoryRequired: boolean;
+}
+
+/**
+ * The one place an installation's modules directory is chosen (ADR 0048).
+ *
+ * - Unset: `<repositoryRoot>/modules`, the development checkout's own directory. A checkout without
+ *   one has no modules, exactly as before.
+ * - Set: an absolute path, normalized and used as given — never resolved against the repository or
+ *   the working directory — and required to exist when discovery reads it. The shipping image sets
+ *   it to `/var/lib/ekklesia/modules`.
+ *
+ * Anything else throws a `ModuleDiscoveryError` carrying `MODULES_DIRECTORY_INVALID` and a fixed
+ * message, so every executable already reports it through the discovery error path it has, and the
+ * supplied value never reaches an error, a log, or a report.
+ *
+ * Nothing here — and nothing that calls it — locates the platform's own files relative to the
+ * result: Core's migrations and package metadata live under `repositoryRoot`, wherever modules are.
+ */
+export function resolveModulesDirectory(
+  options: ResolveModulesDirectoryOptions,
+): ModulesDirectorySelection {
+  if (options.configured === undefined) {
+    return Object.freeze({
+      modulesDirectory: path.join(options.repositoryRoot, "modules"),
+      modulesDirectoryRequired: false,
+    });
+  }
+  if (!isUsableModulesDirectoryPath(options.configured)) {
+    throw new ModuleDiscoveryError([
+      {
+        code: "MODULES_DIRECTORY_INVALID",
+        message: MODULES_DIRECTORY_INVALID_MESSAGE,
+        moduleDirectory: ".",
+      },
+    ]);
+  }
+  const normalized = path.normalize(options.configured);
+  return Object.freeze({
+    modulesDirectory:
+      normalized.length > 1 && normalized.endsWith(path.sep) ? normalized.slice(0, -1) : normalized,
+    modulesDirectoryRequired: true,
+  });
+}

core/src/modules/runtime.ts

@@ -7,15 +7,16 @@ import {
   EMPTY_MODULE_CONFIGURATION,
   EMPTY_MODULE_STORAGE,
   type ModuleConfiguration,
+  type ModuleDatabaseExecutor,
   type ModuleHttpRouteRegistrar,
   type ModuleId,
   ModuleRealtimeError,
   type ModuleRealtimePublisher,
   type ModuleRegistrationContext,
   type ModuleRouteDefinitionInput,
+  type ModuleRouteHandler,
   type ModuleRuntimeContext,
   type ModuleRuntimeDefinition,
-  type ModuleRuntimeServices,
   type ModuleStorage,
   moduleRouteShapeKey,
   moduleRoutesOverlap,
@@ -24,6 +25,7 @@ import {
   type RegisteredModuleHttpRoute,
   safeParseModuleRouteDefinition,
 } from "@ekklesia/contracts";
+import type { AnyModuleRuntimeServices, ModuleDatabase } from "./database.js";
 import {
   type DiscoveredModule,
   discoverModules,
@@ -68,6 +70,7 @@ export type ModuleRuntimeIssueCode =
   | "MODULE_ROUTE_PERMISSION_INVALID"
   | "MODULE_ROUTE_PERMISSION_UNDECLARED"
   | "MODULE_RUNTIME_EXPORT_INVALID"
+  | "MODULE_RUNTIME_DATABASE_MISMATCH"
   | "MODULE_RUNTIME_ID_MISMATCH"
   | "MODULE_RUNTIME_IMPORT_FAILED"
   | "MODULE_RUNTIME_VERSION_MISMATCH"
@@ -105,9 +108,8 @@ export interface StartedModuleRuntime {
 /**
  * Per-module frozen configuration snapshots, keyed by module id (ADR 0029).
  *
- * A lookup rather than a field on `ModuleRuntimeServices`, because `services` is deliberately **one
+ * A lookup rather than a field on `ModuleRuntimeServices`, because configuration is resolved and
- * shared object identity every module receives** — a property this runtime has a test for — while
+ * frozen per module independently of its live service object. A module with no entry receives
- * configuration is per-module by definition. A module with no entry receives
  * `EMPTY_MODULE_CONFIGURATION` rather than `undefined`, so `context.config` is always present and
  * module code never branches on whether the platform supplied one.
  */
@@ -124,12 +126,33 @@ function configurationFor(
  * Per-module scoped object storage, keyed by module id (ADR 0030).
  *
  * A lookup for the same reason configuration is one, and emphatically **not** a field on
- * `ModuleRuntimeServices`: `services` is one shared object identity every module receives, while a
+ * `ModuleRuntimeServices`: a storage facade is scoped to exactly the buckets one module declared.
- * storage facade is scoped to exactly the buckets one module declared. Sharing it would hand every
+ * Sharing it would hand every
  * module every other module's storage.
  */
 export type ModuleStorageLookup = ReadonlyMap<string, ModuleStorage>;
 
+/** One frozen service object per module id. Legacy modules may point at objects wrapping the same
+ * facade; ABI-v1 modules each point at their own attributed executor. */
+export type ModuleRuntimeServicesLookup = ReadonlyMap<string, AnyModuleRuntimeServices>;
+export type ModuleRuntimeServicesSource = ModuleRuntimeServicesLookup | AnyModuleRuntimeServices;
+
+function servicesFor(
+  services: ModuleRuntimeServicesSource,
+  module: DiscoveredModule,
+): AnyModuleRuntimeServices {
+  const selected = "get" in services ? services.get(module.manifest.id) : services;
+  if (!selected) {
+    throw new TypeError(`Module ${module.manifest.id} has no runtime services.`);
+  }
+  const expectsAbi = module.manifest.database?.abi === 1;
+  const isAbi = "abiVersion" in selected.database && selected.database.abiVersion === 1;
+  if (expectsAbi !== isAbi) {
+    throw new TypeError(`Module ${module.manifest.id} has the wrong database service.`);
+  }
+  return selected;
+}
+
 function storageFor(storages: ModuleStorageLookup, moduleId: string): ModuleStorage {
   return storages.get(moduleId) ?? EMPTY_MODULE_STORAGE;
 }
@@ -164,10 +187,9 @@ export interface ModuleRuntimeCompositionOptions extends ModuleRuntimeTimeoutOpt
 export interface StartModuleRuntimeOptions
   extends ModuleDiscoveryOptions,
     ModuleRuntimeCompositionOptions {
-  /** The same frozen services object every started module's `start`/`stop` hooks and (once
+  /** The manifest-selected service object for each module. One module's `start`/`stop` hooks and
-   * `apps/api` mounts routes) HTTP handlers receive for this runtime — a required production
+   * handlers receive its same entry; ABI-v1 entries carry distinct attributed executors. */
-   * dependency, never an optional test-only global. See `ModuleRuntimeServices`. */
+  readonly services: ModuleRuntimeServicesSource;
-  readonly services: ModuleRuntimeServices;
 }
 
 interface LoadedModule {
@@ -175,6 +197,13 @@ interface LoadedModule {
   readonly discovered: DiscoveredModule;
 }
 
+type AnyRegistrationHook = (
+  context: ModuleRegistrationContext<ModuleDatabase | ModuleDatabaseExecutor>,
+) => unknown;
+type AnyRuntimeHook = (
+  context: ModuleRuntimeContext<ModuleDatabase | ModuleDatabaseExecutor>,
+) => unknown;
+
 interface CapabilityRegistrationStage {
   readonly capabilities: CapabilityRegistrar;
   commit(): readonly ModuleRuntimeIssue[];
@@ -316,11 +345,11 @@ class StagedCapabilityRegistry {
   createRuntimeContext(
     module: DiscoveredModule,
     phase: "rollback" | "start" | "stop",
-    services: ModuleRuntimeServices,
+    services: AnyModuleRuntimeServices,
     config: ModuleConfiguration,
     storage: ModuleStorage,
     realtime: ModuleRealtimePublisher,
-  ): ModuleRuntimeContext {
+  ): ModuleRuntimeContext<ModuleDatabase | ModuleDatabaseExecutor> {
     const capabilities: CapabilityResolver = Object.freeze({
       resolve: (capabilityId: CapabilityId): RegisteredCapability | undefined => {
         this.#assertAccess(module, capabilityId, phase);
@@ -469,7 +498,7 @@ class StagedModuleHttpRoutes {
         local.push(
           Object.freeze({
             bodyMode: parsed.data.bodyMode,
-            handler: parsed.data.handler,
+            handler: parsed.data.handler as ModuleRouteHandler,
             maxBodyBytes: parsed.data.maxBodyBytes,
             method: parsed.data.method,
             moduleId: module.manifest.id,
@@ -555,6 +584,19 @@ async function loadRuntimeDefinitions(
         ),
       );
     }
+    const runtimeDeclaresAbi = definition.database?.abi === 1;
+    const manifestDeclaresAbi = discovered.manifest.database?.abi === 1;
+    if (runtimeDeclaresAbi !== manifestDeclaresAbi) {
+      matchesManifest = false;
+      issues.push(
+        runtimeIssue(
+          "MODULE_RUNTIME_DATABASE_MISMATCH",
+          "load",
+          discovered.manifest.id,
+          `Module runtime database declaration does not match manifest ${discovered.manifest.id}.`,
+        ),
+      );
+    }
     if (matchesManifest) {
       loaded.push({ definition, discovered });
     }
@@ -580,15 +622,15 @@ async function registerModules(
       module.discovered.manifest.id,
       new Set(module.discovered.manifest.permissions.map((declaration) => declaration.id)),
     );
-    const context: ModuleRegistrationContext = Object.freeze({
+    const context = Object.freeze({
       capabilities: capabilityStage.capabilities,
       config: configurationFor(configurations, module.discovered.manifest.id),
       http: routeStage.http,
       moduleId: module.discovered.manifest.id,
       realtime: realtimeStage.realtime,
-    });
+    }) as ModuleRegistrationContext<ModuleDatabase | ModuleDatabaseExecutor>;
     try {
-      await module.definition.register?.(context);
+      await (module.definition.register as AnyRegistrationHook | undefined)?.(context);
     } catch (error) {
       if (error instanceof ModuleRuntimeSignal) {
         throw new ModuleRuntimeError([error.issue]);
@@ -685,7 +727,7 @@ async function stopModules(
   modules: readonly LoadedModule[],
   registry: StagedCapabilityRegistry,
   phase: "rollback" | "stop",
-  services: ModuleRuntimeServices,
+  services: ModuleRuntimeServicesSource,
   configurations: ModuleConfigurationLookup,
   storages: ModuleStorageLookup,
   realtimeRegistry: StagedModuleRealtimeRegistry,
@@ -698,7 +740,7 @@ async function stopModules(
     // A dependency may keep doing ordinary work while its dependents stop. Deactivate only the
     // module whose stop hook is about to run, not every publisher at the beginning of the sequence.
     realtimeRegistry.deactivateModule(moduleId);
-    const stop = module.definition.stop;
+    const stop = module.definition.stop as AnyRuntimeHook | undefined;
     if (!stop) {
       // No synthetic callback and no timer for a module that declares no stop hook.
       continue;
@@ -710,13 +752,13 @@ async function stopModules(
             registry.createRuntimeContext(
               module.discovered,
               phase,
-              services,
+              servicesFor(services, module.discovered),
               configurationFor(configurations, moduleId),
               storageFor(storages, moduleId),
               realtimeRegistry.publisherFor(moduleId),
-            ),
+            ) as ModuleRuntimeContext<ModuleDatabase | ModuleDatabaseExecutor>,
           ),
-        ),
+        ).then(() => undefined),
         timeoutMs,
       );
       if (outcome === "timed-out") {
@@ -750,7 +792,7 @@ async function stopModules(
 async function startModules(
   modules: readonly LoadedModule[],
   registry: StagedCapabilityRegistry,
-  services: ModuleRuntimeServices,
+  services: ModuleRuntimeServicesSource,
   configurations: ModuleConfigurationLookup,
   storages: ModuleStorageLookup,
   realtimeRegistry: StagedModuleRealtimeRegistry,
@@ -766,15 +808,15 @@ async function startModules(
   for (const module of modules) {
     rollbackCandidates.push(module);
     try {
-      await module.definition.start?.(
+      await (module.definition.start as AnyRuntimeHook | undefined)?.(
         registry.createRuntimeContext(
           module.discovered,
           "start",
-          services,
+          servicesFor(services, module.discovered),
           configurationFor(configurations, module.discovered.manifest.id),
           storageFor(storages, module.discovered.manifest.id),
           realtimeRegistry.publisherFor(module.discovered.manifest.id),
-        ),
+        ) as ModuleRuntimeContext<ModuleDatabase | ModuleDatabaseExecutor>,
       );
       const missingSnapshots = realtimeRegistry.missingSnapshots(module.discovered.manifest.id);
       if (missingSnapshots.length > 0) {
@@ -831,7 +873,7 @@ async function startModules(
  */
 export async function startDiscoveredModuleRuntime(
   discoveredModules: readonly DiscoveredModule[],
-  services: ModuleRuntimeServices,
+  services: ModuleRuntimeServicesSource,
   timeouts: ModuleRuntimeCompositionOptions = {},
 ): Promise<StartedModuleRuntime> {
   const modules = await loadRuntimeDefinitions(discoveredModules);

core/src/modules/schema-discovery.ts

@@ -1,12 +1,16 @@
 import { pathToFileURL } from "node:url";
 import {
   type ModuleId,
-  type ModuleSchemaDefinition,
+  type ModuleSchemaMetadataDefinition,
   moduleTableLocalNameSchema,
   moduleTablePrefix,
-  parseModuleSchemaDefinition,
+  parseModuleSchemaMetadataDefinition,
   physicalModuleTableNameSchema,
 } from "@ekklesia/contracts";
+import {
+  type ModuleSchemaDefinition,
+  parseModuleSchemaDefinition,
+} from "./legacy-schema-definition.js";
 import { is } from "drizzle-orm";
 import { type AnyPgTable, getTableConfig, PgColumn, PgTable } from "drizzle-orm/pg-core";
 import {
@@ -40,7 +44,9 @@ export interface DiscoveredModuleTable {
   readonly exportName: string;
   readonly moduleId: ModuleId;
   readonly name: string;
-  readonly table: AnyPgTable;
+  /** Present only for a temporary legacy-facade module. ABI-v1 schema discovery publishes no ORM
+   * object and contributes nothing to the legacy aggregate below. */
+  readonly table?: AnyPgTable;
 }
 
 export interface DiscoveredModuleSchema {
@@ -55,21 +61,40 @@ export interface ModuleSchemaAggregate {
   readonly tables: readonly DiscoveredModuleTable[];
 }
 
-interface LoadedModuleSchema {
+interface LoadedLegacyModuleSchema {
   readonly definition: ModuleSchemaDefinition;
   readonly discovered: DiscoveredModule;
+  readonly mode: "legacy";
 }
 
+interface LoadedAbiModuleSchema {
+  readonly definition: ModuleSchemaMetadataDefinition;
+  readonly discovered: DiscoveredModule;
+  readonly mode: "abi-v1";
+}
+
+type LoadedModuleSchema = LoadedLegacyModuleSchema | LoadedAbiModuleSchema;
+
 interface InspectedModuleSchema {
   readonly discovered: DiscoveredModule;
   readonly tables: ModuleTableCandidate[];
 }
 
-interface ModuleTableCandidate extends DiscoveredModuleTable {
+interface LegacyModuleTableCandidate extends DiscoveredModuleTable {
+  readonly mode: "legacy";
   readonly foreignKeys: ReturnType<typeof getTableConfig>["foreignKeys"];
   readonly path: string;
+  readonly table: AnyPgTable;
 }
 
+interface AbiModuleTableCandidate extends DiscoveredModuleTable {
+  readonly mode: "abi-v1";
+  readonly foreignKeys: ModuleSchemaMetadataDefinition["tables"][number]["foreignKeys"];
+  readonly path: string;
+}
+
+type ModuleTableCandidate = LegacyModuleTableCandidate | AbiModuleTableCandidate;
+
 const drizzleTableIsAlias = Symbol.for("drizzle:IsAlias");
 
 export class ModuleSchemaDiscoveryError extends Error {
@@ -156,9 +181,13 @@ async function loadSchemaDefinitions(discoveredModules: readonly DiscoveredModul
       continue;
     }
 
-    let definition: ModuleSchemaDefinition;
+    let definition: ModuleSchemaDefinition | ModuleSchemaMetadataDefinition;
+    const mode = discovered.manifest.database?.abi === 1 ? "abi-v1" : "legacy";
     try {
-      definition = parseModuleSchemaDefinition(defaultExport(moduleNamespace));
+      definition =
+        mode === "abi-v1"
+          ? parseModuleSchemaMetadataDefinition(defaultExport(moduleNamespace))
+          : parseModuleSchemaDefinition(defaultExport(moduleNamespace));
     } catch {
       issues.push(
         issue(
@@ -182,7 +211,11 @@ async function loadSchemaDefinitions(discoveredModules: readonly DiscoveredModul
       continue;
     }
 
-    loaded.push({ definition, discovered });
+    loaded.push(
+      mode === "abi-v1"
+        ? { definition: definition as ModuleSchemaMetadataDefinition, discovered, mode }
+        : { definition: definition as ModuleSchemaDefinition, discovered, mode },
+    );
   }
 
   return { issues, loaded };
@@ -197,6 +230,58 @@ function inspectTables(
 
   for (const loaded of loadedSchemas) {
     const moduleId = loaded.discovered.manifest.id;
+    if (loaded.mode === "abi-v1") {
+      const candidates: AbiModuleTableCandidate[] = [];
+      loaded.definition.tables.forEach((table, index) => {
+        const path = `tables.${index}`;
+        const candidate: AbiModuleTableCandidate = {
+          exportName: table.name,
+          foreignKeys: table.foreignKeys,
+          mode: "abi-v1",
+          moduleId,
+          name: table.name,
+          path,
+        };
+        const tablePrefix = moduleTablePrefix(moduleId);
+        if (!table.name.startsWith(tablePrefix)) {
+          issues.push(
+            issue(
+              "MODULE_SCHEMA_TABLE_NAMESPACE_INVALID",
+              moduleId,
+              `Table ${table.name} is not namespaced for module ${moduleId}.`,
+              { path, tableName: table.name },
+            ),
+          );
+        } else if (
+          !moduleTableLocalNameSchema.safeParse(table.name.slice(tablePrefix.length)).success
+        ) {
+          issues.push(
+            issue(
+              "MODULE_SCHEMA_TABLE_NAME_INVALID",
+              moduleId,
+              `Module ${moduleId} has an invalid local table name.`,
+              { path },
+            ),
+          );
+        }
+        const existing = firstTableByName.get(table.name);
+        if (existing) {
+          issues.push(
+            issue(
+              "MODULE_SCHEMA_TABLE_DUPLICATE",
+              moduleId,
+              `Table ${table.name} is declared more than once.`,
+              { path, tableName: table.name },
+            ),
+          );
+        } else {
+          firstTableByName.set(table.name, candidate);
+        }
+        candidates.push(candidate);
+      });
+      inspectedModules.push({ discovered: loaded.discovered, tables: candidates });
+      continue;
+    }
     const seenTables = new Set<AnyPgTable>();
     const candidates: ModuleTableCandidate[] = [];
     const entries = Object.entries(loaded.definition.tables).sort(([left], [right]) =>
@@ -293,6 +378,7 @@ function inspectTables(
       const candidate: ModuleTableCandidate = {
         exportName,
         foreignKeys: config.foreignKeys,
+        mode: "legacy",
         moduleId,
         name: config.name,
         path,
@@ -321,8 +407,8 @@ function inspectTables(
 }
 
 function validForeignKeyTarget(
-  foreignKey: ModuleTableCandidate["foreignKeys"][number],
+  foreignKey: LegacyModuleTableCandidate["foreignKeys"][number],
-  candidate: ModuleTableCandidate,
+  candidate: LegacyModuleTableCandidate,
 ): AnyPgTable | undefined {
   try {
     const reference = foreignKey.reference();
@@ -356,7 +442,9 @@ function inspectForeignKeys(
   const ownerByTable = new Map<AnyPgTable, ModuleId>();
   for (const inspected of inspectedModules) {
     for (const candidate of inspected.tables) {
-      ownerByTable.set(candidate.table, candidate.moduleId);
+      if (candidate.mode === "legacy") {
+        ownerByTable.set(candidate.table, candidate.moduleId);
+      }
     }
   }
 
@@ -364,6 +452,32 @@ function inspectForeignKeys(
     const moduleId = inspected.discovered.manifest.id;
     const ownedTables = new Set(inspected.tables.map((candidate) => candidate.table));
     for (const candidate of inspected.tables) {
+      if (candidate.mode === "abi-v1") {
+        const ownedNames = new Set(inspected.tables.map((table) => table.name));
+        candidate.foreignKeys.forEach((foreignKey, foreignKeyIndex) => {
+          const path = `${candidate.path}.foreignKeys.${foreignKeyIndex}`;
+          if (!foreignKey.table.startsWith(moduleTablePrefix(moduleId))) {
+            issues.push(
+              issue(
+                "MODULE_SCHEMA_CROSS_MODULE_FOREIGN_KEY",
+                moduleId,
+                `Table ${candidate.name} has a foreign key outside module ${moduleId}.`,
+                { path, tableName: candidate.name },
+              ),
+            );
+          } else if (!ownedNames.has(foreignKey.table)) {
+            issues.push(
+              issue(
+                "MODULE_SCHEMA_FOREIGN_KEY_TARGET_MISSING",
+                moduleId,
+                `Table ${candidate.name} references a table not exported by module ${moduleId}.`,
+                { path, tableName: candidate.name },
+              ),
+            );
+          }
+        });
+        continue;
+      }
       candidate.foreignKeys.forEach((foreignKey, foreignKeyIndex) => {
         const path = `${candidate.path}.foreignKeys.${foreignKeyIndex}`;
         const foreignTable = validForeignKeyTarget(foreignKey, candidate);
@@ -446,7 +560,9 @@ function publishAggregate(
         moduleId: inspected.discovered.manifest.id,
         tables: Object.freeze(
           inspected.tables
-            .map(({ foreignKeys: _foreignKeys, path: _path, ...table }) => Object.freeze(table))
+            .map(({ foreignKeys: _foreignKeys, mode: _mode, path: _path, ...table }) =>
+              Object.freeze(table),
+            )
             .sort((left, right) => compareText(left.exportName, right.exportName)),
         ),
       }),
@@ -458,7 +574,11 @@ function publishAggregate(
       .sort((left, right) => compareText(left.name, right.name)),
   );
   const drizzleSchema = Object.freeze(
-    Object.fromEntries(tables.map((table) => [table.name, table.table] as const)),
+    Object.fromEntries(
+      tables.flatMap((table) =>
+        table.table === undefined ? [] : [[table.name, table.table] as const],
+      ),
+    ),
   );
 
   return Object.freeze({ discoveredModules, drizzleSchema, modules, tables });

core/tests/cli-bootstrap-platform-owner.test.ts

@@ -1,4 +1,5 @@
 import { describe, expect, it, vi } from "vitest";
+import { IMPORT_SAFETY_TEST_TIMEOUT_MS } from "./support/import-safety.js";
 
 const poolConstructor = vi.hoisted(() => vi.fn());
 
@@ -7,16 +8,20 @@ vi.mock("pg", () => ({ Pool: poolConstructor }));
 describe("bootstrap-platform-owner CLI import safety", () => {
   const originalEnv = { ...process.env };
 
-  it("does not read DATABASE_URL, connect to PostgreSQL, or run bootstrap merely by importing the module", async () => {
+  it(
-    delete process.env.DATABASE_URL;
+    "does not read DATABASE_URL, connect to PostgreSQL, or run bootstrap merely by importing the module",
+    async () => {
+      delete process.env.DATABASE_URL;
 
-    // Under Vitest, process.argv[1] is never this file's own path, so isDirectExecution() is
+      // Under Vitest, process.argv[1] is never this file's own path, so isDirectExecution() is
-    // false the same way it naturally is for apps/api/src/server.ts under its own test suite —
+      // false the same way it naturally is for apps/api/src/server.ts under its own test suite —
-    // no argv manipulation is needed to prove the guard holds.
+      // no argv manipulation is needed to prove the guard holds.
-    await expect(import("../src/cli/bootstrap-platform-owner.js")).resolves.toBeDefined();
+      await expect(import("../src/cli/bootstrap-platform-owner.js")).resolves.toBeDefined();
 
-    expect(poolConstructor).not.toHaveBeenCalled();
+      expect(poolConstructor).not.toHaveBeenCalled();
 
-    process.env = originalEnv;
+      process.env = originalEnv;
-  });
+    },
+    IMPORT_SAFETY_TEST_TIMEOUT_MS,
+  );
 });

core/tests/cli-create-initial-owner.test.ts

@@ -1,4 +1,5 @@
 import { describe, expect, it, vi } from "vitest";
+import { IMPORT_SAFETY_TEST_TIMEOUT_MS } from "./support/import-safety.js";
 
 const poolConstructor = vi.hoisted(() => vi.fn());
 
@@ -7,18 +8,22 @@ vi.mock("pg", () => ({ Pool: poolConstructor }));
 describe("create-initial-owner CLI import safety", () => {
   const originalEnv = { ...process.env };
 
-  it("does not read DATABASE_URL, connect to PostgreSQL, or create anything merely by importing the module", async () => {
+  it(
-    delete process.env.DATABASE_URL;
+    "does not read DATABASE_URL, connect to PostgreSQL, or create anything merely by importing the module",
+    async () => {
+      delete process.env.DATABASE_URL;
 
-    // Under Vitest, process.argv[1] is never this file's own path, so isDirectExecution() is false
+      // Under Vitest, process.argv[1] is never this file's own path, so isDirectExecution() is false
-    // exactly as it is for `bootstrap-platform-owner.ts` — no argv manipulation is needed to prove
+      // exactly as it is for `bootstrap-platform-owner.ts` — no argv manipulation is needed to prove
-    // the guard holds. Importing the command must never prompt, connect, or write.
+      // the guard holds. Importing the command must never prompt, connect, or write.
-    await expect(import("../src/cli/create-initial-owner.js")).resolves.toBeDefined();
+      await expect(import("../src/cli/create-initial-owner.js")).resolves.toBeDefined();
 
-    expect(poolConstructor).not.toHaveBeenCalled();
+      expect(poolConstructor).not.toHaveBeenCalled();
 
-    process.env = originalEnv;
+      process.env = originalEnv;
-  });
+    },
+    IMPORT_SAFETY_TEST_TIMEOUT_MS,
+  );
 
   it("reads no environment variable for the password", async () => {
     // The password is prompted for or read from standard input; it is deliberately never taken from

core/tests/core-migration-discovery.test.ts

@@ -91,7 +91,7 @@ async function createModule(
     writeFile(
       path.join(moduleDirectory, "ekklesia.module.json"),
       JSON.stringify({
-        manifestVersion: 7,
+        manifestVersion: 8,
         id,
         name: `${id} module`,
         version: "0.1.0",

core/tests/dashboard-flat-modules.test.ts

@@ -59,7 +59,7 @@ async function createModule(modulesDirectory: string, fixture: ModuleFixture): P
         : {}),
       entrypoints: { server: "./dist/server/index.js", ui: "./dist/ui/index.js" },
       id: fixture.id,
-      manifestVersion: 7,
+      manifestVersion: 8,
       name: fixture.name,
       version: "1.0.0",
     }),

core/tests/doctor-host-configuration.test.ts

@@ -8,10 +8,11 @@ import {
   diagnoseEkklesia,
   formatDoctorReport,
 } from "../src/diagnostics/index.js";
-import type {
+import {
-  DiscoveredModule,
+  type DiscoveredModule,
-  ModuleMigrationAggregate,
+  discoverModules,
-  ModuleSchemaAggregate,
+  type ModuleMigrationAggregate,
+  type ModuleSchemaAggregate,
 } from "../src/modules/index.js";
 
 /**
@@ -34,8 +35,8 @@ const moduleSecret = "module-secret-material";
 
 const metadata = Object.freeze({
   moduleSdkVersion: "0.1.0",
-  modulesDirectory: "/not-rendered/modules",
   platformVersion: "0.1.0",
+  repositoryRoot: "/not-rendered",
   runtimeRange: ">=24.11.0 <25",
   runtimeVersion: "24.15.0",
 });
@@ -82,7 +83,7 @@ function discoveredModule(id: string, overrides: Record<string, unknown> = {}):
       },
       entrypoints: { server: "./dist/server.js" },
       id,
-      manifestVersion: 7,
+      manifestVersion: 8,
       name: `${id} module`,
       permissions: [],
       storage: { buckets: [] },
@@ -454,3 +455,33 @@ describe("Doctor host-configuration parity — sanitization", () => {
     expect(JSON.stringify(report)).not.toContain("S3_ACCESS_KEY");
   });
 });
+
+describe("Doctor reads the modules directory from the same host configuration (ADR 0048)", () => {
+  it("uses the repository's own modules directory when EKKLESIA_MODULES_DIR is unset", () => {
+    const doctorOptions = createDoctorOptions(environment(), metadata);
+    expect(doctorOptions.moduleDiscovery.modulesDirectory).toBe("/not-rendered/modules");
+    expect(doctorOptions.moduleDiscovery.modulesDirectoryRequired).toBe(false);
+    expect(doctorOptions.coreMigrationsDirectory).toBe("/not-rendered/core/drizzle");
+  });
+
+  it("uses a configured directory, and still finds Core's migrations under the platform", () => {
+    const doctorOptions = createDoctorOptions(
+      environment({ EKKLESIA_MODULES_DIR: "/var/lib/ekklesia/modules" }),
+      metadata,
+    );
+    expect(doctorOptions.moduleDiscovery.modulesDirectory).toBe("/var/lib/ekklesia/modules");
+    expect(doctorOptions.moduleDiscovery.modulesDirectoryRequired).toBe(true);
+    expect(doctorOptions.coreMigrationsDirectory).toBe("/not-rendered/core/drizzle");
+  });
+
+  it("hands an unusable value to discovery to report, rather than throwing before a report exists", async () => {
+    const doctorOptions = createDoctorOptions(
+      environment({ EKKLESIA_MODULES_DIR: "relative/private-mount-91aa" }),
+      metadata,
+    );
+    expect(doctorOptions.moduleDiscovery.modulesDirectoryRequired).toBe(true);
+    const report = await diagnoseEkklesia(doctorOptions, dependencies({ discoverModules }));
+    expect(report.checks.find((entry) => entry.id === "modules.discovery")?.status).toBe("failure");
+    expect(JSON.stringify(report)).not.toContain("private-mount-91aa");
+  });
+});

core/tests/doctor-import.test.ts

@@ -1,4 +1,5 @@
 import { describe, expect, it, vi } from "vitest";
+import { IMPORT_SAFETY_TEST_TIMEOUT_MS } from "./support/import-safety.js";
 
 const discoverModules = vi.fn();
 const discoverModuleSchemas = vi.fn();
@@ -22,24 +23,28 @@ vi.mock("../src/migrations/index.js", async (importOriginal) => ({
 }));
 
 describe("Doctor import safety", () => {
-  it("does not discover, connect, plan, or print when imported", async () => {
+  it(
-    const log = vi.spyOn(console, "log").mockImplementation(() => undefined);
+    "does not discover, connect, plan, or print when imported",
-    const error = vi.spyOn(console, "error").mockImplementation(() => undefined);
+    async () => {
+      const log = vi.spyOn(console, "log").mockImplementation(() => undefined);
+      const error = vi.spyOn(console, "error").mockImplementation(() => undefined);
 
-    await import("../src/diagnostics/index.js");
+      await import("../src/diagnostics/index.js");
-    await import("../src/cli/doctor.js");
+      await import("../src/cli/doctor.js");
-    await import("../src/index.js");
+      await import("../src/index.js");
 
-    expect(discoverModules).not.toHaveBeenCalled();
+      expect(discoverModules).not.toHaveBeenCalled();
-    expect(discoverModuleSchemas).not.toHaveBeenCalled();
+      expect(discoverModuleSchemas).not.toHaveBeenCalled();
-    expect(discoverModuleMigrations).not.toHaveBeenCalled();
+      expect(discoverModuleMigrations).not.toHaveBeenCalled();
-    expect(startModuleRuntime).not.toHaveBeenCalled();
+      expect(startModuleRuntime).not.toHaveBeenCalled();
-    expect(createPostgresMigrationDatabase).not.toHaveBeenCalled();
+      expect(createPostgresMigrationDatabase).not.toHaveBeenCalled();
-    expect(planModuleMigrations).not.toHaveBeenCalled();
+      expect(planModuleMigrations).not.toHaveBeenCalled();
-    expect(log).not.toHaveBeenCalled();
+      expect(log).not.toHaveBeenCalled();
-    expect(error).not.toHaveBeenCalled();
+      expect(error).not.toHaveBeenCalled();
 
-    log.mockRestore();
+      log.mockRestore();
-    error.mockRestore();
+      error.mockRestore();
-  });
+    },
+    IMPORT_SAFETY_TEST_TIMEOUT_MS,
+  );
 });

core/tests/doctor-report.test.ts

@@ -68,6 +68,7 @@ describe("Ekklesia Doctor terminal report", () => {
   it("renders the real zero-module and no-database shape exactly", async () => {
     const report = await diagnoseEkklesia(
       {
+        coreMigrationsDirectory: "/not-rendered/core/drizzle",
         moduleDiscovery: {
           moduleSdkVersion: "0.1.0",
           modulesDirectory: "/not-rendered/modules",
@@ -135,6 +136,7 @@ Result: READY WITH WARNINGS`);
   it("renders every check the report contains, so none can silently affect the result", async () => {
     const report = await diagnoseEkklesia(
       {
+        coreMigrationsDirectory: "/not-rendered/core/drizzle",
         moduleDiscovery: {
           moduleSdkVersion: "0.1.0",
           modulesDirectory: "/not-rendered/modules",
@@ -159,6 +161,7 @@ Result: READY WITH WARNINGS`);
   it("does not depend on NO_COLOR or terminal interactivity", async () => {
     const report = await diagnoseEkklesia(
       {
+        coreMigrationsDirectory: "/not-rendered/core/drizzle",
         moduleDiscovery: {
           moduleSdkVersion: "0.1.0",
           modulesDirectory: "/not-rendered/modules",
@@ -207,6 +210,7 @@ Result: READY WITH WARNINGS`);
     const report = await diagnoseEkklesia(
       {
         databaseUrl: "postgresql://another:[email protected]/db",
+        coreMigrationsDirectory: "/not-rendered/core/drizzle",
         moduleDiscovery: {
           moduleSdkVersion: "0.1.0",
           modulesDirectory: "/not-rendered/modules",

core/tests/doctor.test.ts

@@ -1,5 +1,9 @@
+import { mkdtemp, rm } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
 import { type ModuleManifest, parsePermissionId } from "@ekklesia/contracts";
-import { describe, expect, it, vi } from "vitest";
+import { afterEach, describe, expect, it, vi } from "vitest";
 import { createPermissionRegistry, PermissionRegistryError } from "../src/authorization/index.js";
 import {
   type DoctorCheck,
@@ -28,7 +32,11 @@ const checksumA = "a".repeat(64);
 const checksumB = "b".repeat(64);
 const checksumC = "c".repeat(64);
 
-function discoveredModule(id: string, version = "0.1.0"): DiscoveredModule {
+function discoveredModule(
+  id: string,
+  version = "0.1.0",
+  database?: { readonly abi: 1 },
+): DiscoveredModule {
   return {
     contributions: [],
     directory: `/unpublished/${id}`,
@@ -37,13 +45,14 @@ function discoveredModule(id: string, version = "0.1.0"): DiscoveredModule {
       capabilities: [],
       compatibility: { moduleSdk: "^0.1.0", platform: "^0.1.0" },
       configuration: [],
+      ...(database ? { database } : {}),
       dependencies: {
         capabilities: { optional: {}, required: {} },
         modules: { optional: {}, required: {} },
       },
       entrypoints: { server: "./dist/server.js" },
       id,
-      manifestVersion: 7,
+      manifestVersion: 8,
       name: `${id} module`,
       permissions: [],
       storage: { buckets: [] },
@@ -114,7 +123,10 @@ function emptyDatabase(): MigrationDatabase {
   });
 }
 
-function plan(entries: MigrationPlanResult["entries"] = []): MigrationPlanResult {
+function plan(
+  entries: MigrationPlanResult["entries"] = [],
+  retained: MigrationPlanResult["retained"] = [],
+): MigrationPlanResult {
   const appliedCount = entries.filter((entry) => entry.status === "applied").length;
   const approvalRequiredCount = entries.filter(
     (entry) => entry.status === "approval-blocked",
@@ -124,6 +136,7 @@ function plan(entries: MigrationPlanResult["entries"] = []): MigrationPlanResult
     approvalRequiredCount,
     entries: Object.freeze([...entries]),
     pendingCount: entries.length - appliedCount,
+    retained: Object.freeze([...retained]),
   });
 }
 
@@ -151,6 +164,7 @@ function dependencies(overrides: Partial<DoctorDependencies> = {}): DoctorDepend
 function options(databaseUrl?: string): DoctorOptions {
   return {
     ...(databaseUrl === undefined ? {} : { databaseUrl }),
+    coreMigrationsDirectory: "/not-rendered/core/drizzle",
     moduleDiscovery: {
       moduleSdkVersion: "0.1.0",
       modulesDirectory: "/not-rendered/modules",
@@ -285,7 +299,7 @@ describe("Ekklesia Doctor outbound email reporting", () => {
 describe("Ekklesia Doctor diagnostics", () => {
   it("publishes a healthy deterministic static report without database configuration", async () => {
     const people = discoveredModule("people");
-    const calendar = discoveredModule("calendar", "0.2.0");
+    const calendar = discoveredModule("calendar", "0.2.0", { abi: 1 });
     const inventory = migrationAggregate(
       [migration("people", "0000_initial", checksumA)],
       [people, calendar],
@@ -318,6 +332,7 @@ describe("Ekklesia Doctor diagnostics", () => {
     ]);
     expect(check(report, "modules.discovery").details).toEqual(["people 0.1.0", "calendar 0.2.0"]);
     expect(check(report, "modules.dependencies").details).toEqual(["Order: people → calendar"]);
+    expect(check(report, "schemas.discovery")).toMatchObject({ status: "pass" });
     expect(check(report, "modules.permissions")).toMatchObject({
       details: ["0 permissions registered"],
       status: "pass",
@@ -1657,3 +1672,113 @@ describe("Doctor reports declared browser contributions", () => {
     ]);
   });
 });
+
+describe("Doctor with installation-owned module storage (ADR 0048)", () => {
+  const platformCoreMigrations = path.join(
+    path.dirname(fileURLToPath(import.meta.url)),
+    "..",
+    "drizzle",
+  );
+  const temporaryDirectories: string[] = [];
+
+  afterEach(async () => {
+    await Promise.all(
+      temporaryDirectories.splice(0).map((directory) => rm(directory, { recursive: true })),
+    );
+  });
+
+  it("finds Core's migrations where the platform is installed, not beside the modules", async () => {
+    // A modules directory far from the platform, as the image mounts /var/lib/ekklesia/modules. Its
+    // parent has no `core/drizzle`, so a Doctor that still derived Core's migrations from the
+    // modules directory would fail migration discovery here.
+    const external = await mkdtemp(path.join(tmpdir(), "ekklesia-external-modules-"));
+    temporaryDirectories.push(external);
+    const report = await diagnoseEkklesia({
+      coreMigrationsDirectory: platformCoreMigrations,
+      moduleDiscovery: {
+        moduleSdkVersion: "0.1.0",
+        modulesDirectory: external,
+        modulesDirectoryRequired: true,
+        platformVersion: "0.1.0",
+      },
+      runtimeRange: ">=24.11.0 <25",
+      runtimeVersion: "24.15.0",
+    });
+
+    expect(check(report, "modules.discovery").status).toBe("pass");
+    const migrations = check(report, "migrations.discovery");
+    expect(migrations.status).toBe("pass");
+    expect(migrations.details.some((detail) => detail.startsWith("core:0000_"))).toBe(true);
+    expect(JSON.stringify(report)).not.toContain(external);
+  });
+
+  it("reports an unusable configured modules directory as a discovery failure, naming no path", async () => {
+    const report = await diagnoseEkklesia({
+      coreMigrationsDirectory: platformCoreMigrations,
+      moduleDiscovery: {
+        moduleSdkVersion: "0.1.0",
+        modulesDirectory: "relative/private-mount-3c9d",
+        modulesDirectoryRequired: true,
+        platformVersion: "0.1.0",
+      },
+      runtimeRange: ">=24.11.0 <25",
+      runtimeVersion: "24.15.0",
+    });
+
+    const discovery = check(report, "modules.discovery");
+    expect(discovery.status).toBe("failure");
+    expect(discovery.details).toEqual(["The configured modules directory is not usable."]);
+    expect(check(report, "migrations.discovery").status).toBe("skipped");
+    expect(JSON.stringify(report)).not.toContain("private-mount-3c9d");
+  });
+
+  it("reports a configured modules directory that does not exist, naming no path", async () => {
+    const parent = await mkdtemp(path.join(tmpdir(), "ekklesia-missing-modules-"));
+    temporaryDirectories.push(parent);
+    const report = await diagnoseEkklesia({
+      coreMigrationsDirectory: platformCoreMigrations,
+      moduleDiscovery: {
+        moduleSdkVersion: "0.1.0",
+        modulesDirectory: path.join(parent, "absent"),
+        modulesDirectoryRequired: true,
+        platformVersion: "0.1.0",
+      },
+      runtimeRange: ">=24.11.0 <25",
+      runtimeVersion: "24.15.0",
+    });
+
+    const discovery = check(report, "modules.discovery");
+    expect(discovery.status).toBe("failure");
+    expect(discovery.details).toEqual(["The configured modules directory could not be read."]);
+    expect(JSON.stringify(report)).not.toContain(parent);
+  });
+
+  it("reports an absent module's retained history without blocking readiness", async () => {
+    const report = await diagnoseEkklesia(
+      options("postgres://[email protected]/ekklesia"),
+      dependencies({
+        planMigrations: vi.fn(async () =>
+          plan(
+            [planEntry("core:0000_identity_core_tables", "a".repeat(64), "applied")],
+            [Object.freeze({ appliedCount: 2, moduleId: "calendar" })],
+          ),
+        ),
+      }),
+    );
+
+    const planCheck = check(report, "postgresql.plan");
+    expect(planCheck.status).toBe("pass");
+    expect(planCheck.details).toContain(
+      "retained · calendar · 2 applied migrations kept; the module is not installed",
+    );
+  });
+
+  it("passes Core's own migration directory to migration discovery", async () => {
+    const discoverMigrations = vi.fn(async () => migrationAggregate());
+    await diagnoseEkklesia(options(), dependencies({ discoverMigrations }));
+    expect(discoverMigrations).toHaveBeenCalledWith({
+      coreMigrationsDirectory: "/not-rendered/core/drizzle",
+      moduleDiscovery: options().moduleDiscovery,
+    });
+  });
+});

core/tests/fixtures/module-database-integration/db-facade/ekklesia.module.json

@@ -1,12 +1,12 @@
 {
-  "manifestVersion": 7,
+  "manifestVersion": 8,
   "id": "db-facade",
   "name": "Database Facade Integration Test Module",
   "description": "Test-only installed module fixture proving ModuleDatabase against real PostgreSQL. Never discovered by production startup, Doctor, or normal migration aggregation — only apps/api/tests/module-database.integration.ts points discovery at it explicitly.",
   "version": "0.1.0",
   "compatibility": {
-    "platform": "^0.1.0",
+    "platform": "^0.2.0",
-    "moduleSdk": "^0.1.0"
+    "moduleSdk": "^0.2.0"
   },
   "permissions": [
     {

core/tests/host-configuration-boundaries.test.ts

@@ -68,6 +68,7 @@ const INTERPRETED_VARIABLES = Object.freeze([
   "EKKLESIA_IDENTITY_BASE_URL",
   "EKKLESIA_IDENTITY_SECRET",
   "EKKLESIA_IDENTITY_TRUSTED_ORIGINS",
+  "EKKLESIA_MODULES_DIR",
   "EKKLESIA_PUBLIC_SIGNUP_ENABLED",
   "EKKLESIA_SMTP_FROM_ADDRESS",
   "EKKLESIA_SMTP_FROM_NAME",

core/tests/host-configuration.test.ts

@@ -48,6 +48,19 @@ describe("host configuration loading", () => {
     expect(host.identity.secret).toBeUndefined();
   });
 
+  it("carries the configured modules directory verbatim, and nothing when it is unset", () => {
+    expect(loadHostConfiguration({}).modulesDirectory).toBeUndefined();
+    expect(
+      loadHostConfiguration({ EKKLESIA_MODULES_DIR: "/var/lib/ekklesia/modules" }).modulesDirectory,
+    ).toBe("/var/lib/ekklesia/modules");
+    // Validation is the resolver's job (ADR 0048). The loader neither repairs a relative or blank
+    // value nor treats a set-but-empty variable as unset, so the resolver can refuse it.
+    expect(
+      loadHostConfiguration({ EKKLESIA_MODULES_DIR: "relative/modules" }).modulesDirectory,
+    ).toBe("relative/modules");
+    expect(loadHostConfiguration({ EKKLESIA_MODULES_DIR: "" }).modulesDirectory).toBe("");
+  });
+
   it("carries every object-storage field the storage passes established", () => {
     const host = loadHostConfiguration(productionEnvironment);
 

core/tests/legacy-schema-definition.test.ts

@@ -0,0 +1,34 @@
+import { alias, getTableConfig, integer, pgTable } from "drizzle-orm/pg-core";
+import { describe, expect, it } from "vitest";
+import { parseModuleSchemaDefinition } from "../src/modules/legacy-schema-definition.js";
+
+describe("the legacy module schema definition", () => {
+  it("normalizes and freezes a typed schema definition without freezing its tables", () => {
+    const records = pgTable("example_records", { id: integer().primaryKey() });
+    const definition = parseModuleSchemaDefinition({
+      moduleId: "example",
+      tables: { records },
+    });
+
+    expect(definition.tables.records).toBe(records);
+    expect(getTableConfig(records).name).toBe("example_records");
+    expect(Object.isFrozen(definition)).toBe(true);
+    expect(Object.isFrozen(definition.tables)).toBe(true);
+    expect(Object.isFrozen(records)).toBe(false);
+  });
+
+  it("rejects malformed, empty, unknown, and non-PostgreSQL table definitions", () => {
+    const records = pgTable("example_records", { id: integer() });
+    const disguisedRecords = alias(records, "example_disguised_records");
+    expect(() => parseModuleSchemaDefinition({ moduleId: "example", tables: {} })).toThrow();
+    expect(() =>
+      parseModuleSchemaDefinition({ moduleId: "example", tables: { records: {} } }),
+    ).toThrow();
+    expect(() =>
+      parseModuleSchemaDefinition({ moduleId: "example", tables: { records }, extra: true }),
+    ).toThrow();
+    expect(() =>
+      parseModuleSchemaDefinition({ moduleId: "example", tables: { disguisedRecords } }),
+    ).toThrow();
+  });
+});

core/tests/migration-report.test.ts

@@ -40,6 +40,7 @@ describe("migration command reports", () => {
         }),
       ]),
       pendingCount: 2,
+      retained: Object.freeze([]),
     });
 
     expect(formatMigrationPlanReport(plan)).toEqual([
@@ -64,6 +65,7 @@ describe("migration command reports", () => {
       ]),
       appliedCount: 1,
       noOp: false,
+      retained: Object.freeze([]),
     });
 
     expect(formatMigrationApplyReport(applied)).toEqual([
@@ -72,7 +74,12 @@ describe("migration command reports", () => {
     ]);
     expect(
       formatMigrationApplyReport(
-        Object.freeze({ applied: Object.freeze([]), appliedCount: 0, noOp: true }),
+        Object.freeze({
+          applied: Object.freeze([]),
+          appliedCount: 0,
+          noOp: true,
+          retained: Object.freeze([]),
+        }),
       ),
     ).toEqual(["Migration apply completed: database is already current (no changes)."]);
   });
@@ -85,6 +92,7 @@ describe("migration command reports", () => {
           approvalRequiredCount: 0,
           entries: Object.freeze([]),
           pendingCount: 0,
+          retained: Object.freeze([]),
         }),
       ),
     ).toEqual([
@@ -93,4 +101,62 @@ describe("migration command reports", () => {
       "Informational only: this plan is read-only and may become stale; apply revalidates history under the migration lock.",
     ]);
   });
+
+  it("reports an absent module's retained history without treating it as work (ADR 0048)", () => {
+    const retained = Object.freeze([
+      Object.freeze({ appliedCount: 1, moduleId: "calendar" }),
+      Object.freeze({ appliedCount: 3, moduleId: "signage" }),
+    ]);
+    const retainedLines = [
+      "- [retained] calendar: 1 applied migration kept; the module is not installed",
+      "- [retained] signage: 3 applied migrations kept; the module is not installed",
+    ];
+
+    expect(
+      formatMigrationPlanReport(
+        Object.freeze({
+          appliedCount: 0,
+          approvalRequiredCount: 0,
+          entries: Object.freeze([]),
+          pendingCount: 0,
+          retained,
+        }),
+      ),
+    ).toEqual([
+      "Migration plan (0 applied, 0 pending, 0 approval-blocked, 2 retained):",
+      "- No installed module migrations.",
+      ...retainedLines,
+      "Informational only: this plan is read-only and may become stale; apply revalidates history under the migration lock.",
+    ]);
+    expect(
+      formatMigrationApplyReport(
+        Object.freeze({ applied: Object.freeze([]), appliedCount: 0, noOp: true, retained }),
+      ),
+    ).toEqual([
+      "Migration apply completed: database is already current (no changes).",
+      ...retainedLines,
+    ]);
+    expect(
+      formatMigrationApplyReport(
+        Object.freeze({
+          applied: Object.freeze([
+            Object.freeze({
+              checksum: "e".repeat(64),
+              identity: "core:0007_later",
+              index: 7,
+              moduleId: "core",
+              tag: "0007_later",
+            }),
+          ]),
+          appliedCount: 1,
+          noOp: false,
+          retained,
+        }),
+      ),
+    ).toEqual([
+      "Migration apply completed (1 migration applied):",
+      `- core:0007_later sha256=${"e".repeat(64)}`,
+      ...retainedLines,
+    ]);
+  });
 });

core/tests/module-configuration-lifecycle.test.ts

@@ -17,7 +17,7 @@ function fakeModule(
   } = {},
 ): DiscoveredModule {
   const manifest = parseModuleManifest({
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "1.0.0",

core/tests/module-configuration-store.integration.ts

@@ -194,7 +194,7 @@ afterAll(async () => {
 
 function manifestWith(configuration: readonly Record<string, unknown>[], id = "announcements") {
   return parseModuleManifest({
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "1.0.0",

core/tests/module-configuration.test.ts

@@ -21,7 +21,7 @@ function manifestWith(
   id = "announcements",
 ) {
   return parseModuleManifest({
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "1.0.0",
@@ -92,7 +92,7 @@ describe("module configuration declarations", () => {
 
   it("rejects two declarations of the same key, so an ordinary key and a secret can never collide", () => {
     const result = safeParseModuleManifest({
-      manifestVersion: 7,
+      manifestVersion: 8,
       id: "announcements",
       name: "announcements module",
       version: "1.0.0",
@@ -114,7 +114,7 @@ describe("module configuration declarations", () => {
 
   it("rejects a default on a secret, because a checked-in default credential is a leaked one", () => {
     const result = safeParseModuleManifest({
-      manifestVersion: 7,
+      manifestVersion: 8,
       id: "announcements",
       name: "announcements module",
       version: "1.0.0",
@@ -130,7 +130,7 @@ describe("module configuration declarations", () => {
 
   it("rejects a key that is both required and defaulted, which states an intent nothing can honour", () => {
     const result = safeParseModuleManifest({
-      manifestVersion: 7,
+      manifestVersion: 8,
       id: "announcements",
       name: "announcements module",
       version: "1.0.0",
@@ -169,7 +169,7 @@ describe("module configuration declarations", () => {
     ],
   ])("rejects %s", (_label, declaration) => {
     const result = safeParseModuleManifest({
-      manifestVersion: 7,
+      manifestVersion: 8,
       id: "announcements",
       name: "announcements module",
       version: "1.0.0",
@@ -189,7 +189,7 @@ describe("module configuration declarations", () => {
     "valueOf",
   ])("rejects the reserved object property name %s as a configuration key", (key) => {
     const result = safeParseModuleManifest({
-      manifestVersion: 7,
+      manifestVersion: 8,
       id: "announcements",
       name: "announcements module",
       version: "1.0.0",
@@ -210,7 +210,7 @@ describe("module configuration declarations", () => {
     "",
   ])("rejects the malformed configuration key %s", (key) => {
     const result = safeParseModuleManifest({
-      manifestVersion: 7,
+      manifestVersion: 8,
       id: "announcements",
       name: "announcements module",
       version: "1.0.0",
@@ -591,7 +591,7 @@ describe("configuration over a real discovered inventory", () => {
       writeFile(
         path.join(moduleDirectory, "ekklesia.module.json"),
         JSON.stringify({
-          manifestVersion: 7,
+          manifestVersion: 8,
           id,
           name: `${id} module`,
           version: "1.0.0",

core/tests/module-database-abi.test.ts

@@ -0,0 +1,867 @@
+import { readFile } from "node:fs/promises";
+import {
+  isModuleDatabaseError,
+  type ModuleDatabaseErrorCode,
+  type ModuleDatabaseTransaction,
+} from "@ekklesia/contracts";
+import { DatabaseError, type Pool } from "pg";
+import { describe, expect, it, vi } from "vitest";
+import {
+  createModuleDatabaseExecutor,
+  moduleDatabaseExecutorModuleId,
+} from "../src/modules/database-abi.js";
+import {
+  decodeModuleDatabaseValue,
+  encodeModuleDatabaseParameters,
+  MODULE_DATABASE_MAX_PARAMETERS,
+  parsePostgresArrayText,
+} from "../src/modules/database-abi-values.js";
+
+/**
+ * Module Database ABI v1 (ADR 0050) without a database: parameter validation and encoding, result
+ * decoding from PostgreSQL text, option validation, error sanitization, and scope bookkeeping.
+ *
+ * Everything that depends on PostgreSQL's own behaviour (type OIDs, the protocol, SQLSTATEs,
+ * transactions, savepoints, session settings) is proven against a real database in
+ * `module-database-abi.integration.ts`. The scripted client here only replays command tags and
+ * transaction status, so the executor's own bookkeeping can be observed statement by statement.
+ */
+
+async function rejection(promise: Promise<unknown>): Promise<unknown> {
+  try {
+    await promise;
+  } catch (error) {
+    return error;
+  }
+  throw new Error("Expected the operation to reject.");
+}
+
+async function expectAbiError(
+  promise: Promise<unknown>,
+  code: ModuleDatabaseErrorCode,
+  sqlState?: string,
+): Promise<void> {
+  const error = await rejection(promise);
+  expect(isModuleDatabaseError(error)).toBe(true);
+  expect(error).toMatchObject({ code });
+  expect((error as { sqlState?: string }).sqlState).toBe(sqlState);
+}
+
+function syncThrows(run: () => unknown): unknown {
+  try {
+    run();
+  } catch (error) {
+    return error;
+  }
+  throw new Error("Expected the call to throw.");
+}
+
+// --- Parameters --------------------------------------------------------------------------------
+
+describe("encodeModuleDatabaseParameters", () => {
+  it("encodes every scalar category as text, or bytes, and nothing else", () => {
+    const bytes = new Uint8Array([0, 1, 255]);
+    const encoded = encodeModuleDatabaseParameters([
+      null,
+      true,
+      false,
+      1.5,
+      Number.NaN,
+      Number.POSITIVE_INFINITY,
+      Number.NEGATIVE_INFINITY,
+      9_007_199_254_740_993n,
+      'it\'s \\ "quoted"',
+      bytes,
+    ]);
+    expect(encoded.slice(0, 9)).toEqual([
+      null,
+      "true",
+      "false",
+      "1.5",
+      "NaN",
+      "Infinity",
+      "-Infinity",
+      "9007199254740993",
+      'it\'s \\ "quoted"',
+    ]);
+    expect(Buffer.isBuffer(encoded[9])).toBe(true);
+    expect([...(encoded[9] as Buffer)]).toEqual([0, 1, 255]);
+  });
+
+  it("copies bytes, so a later change by the caller cannot reach the statement", () => {
+    const bytes = new Uint8Array([1, 2, 3]);
+    const view = bytes.subarray(1);
+    const [encoded] = encodeModuleDatabaseParameters([view]);
+    bytes[1] = 9;
+    expect([...(encoded as Buffer)]).toEqual([2, 3]);
+  });
+
+  it("encodes arrays as quoted PostgreSQL array literals, nested for more dimensions", () => {
+    expect(
+      encodeModuleDatabaseParameters([
+        [1, null, 3],
+        ['a"b', "c\\d", "", "NULL", "{,}"],
+        [
+          [1, 2],
+          [3, 4],
+        ],
+        [new Uint8Array([0, 255])],
+        [true, 2n],
+        [],
+      ]),
+    ).toEqual([
+      '{"1",NULL,"3"}',
+      '{"a\\"b","c\\\\d","","NULL","{,}"}',
+      '{{"1","2"},{"3","4"}}',
+      '{"\\\\x00ff"}',
+      '{"true","2"}',
+      "{}",
+    ]);
+  });
+
+  it("treats omitted values as no parameters", () => {
+    expect(encodeModuleDatabaseParameters(undefined)).toEqual([]);
+  });
+
+  class Point {
+    readonly x = 1;
+  }
+
+  const refused: readonly [string, unknown][] = [
+    ["a Date", new Date(0)],
+    ["a plain object", { a: 1 }],
+    ["a null-prototype object", Object.create(null)],
+    ["undefined", undefined],
+    ["a function", () => 1],
+    ["a symbol", Symbol("s")],
+    ["a class instance", new Point()],
+    ["a Map", new Map()],
+    ["another typed array", new Int16Array([1])],
+    ["an ArrayBuffer", new ArrayBuffer(1)],
+    ["a boxed string", new String("x")],
+    ["an array holding a Date", [new Date(0)]],
+    ["an array holding undefined", [1, undefined]],
+    ["an array holding an object", [{ a: 1 }]],
+    // biome-ignore lint/suspicious/noSparseArray: the hole is the case under test.
+    ["a sparse array", [1, , 3]],
+    ["scalars mixed with sub-arrays", [1, [2]]],
+    ["a null where a sub-array belongs", [[1], null]],
+    ["ragged sub-arrays", [[1], [1, 2]]],
+    ["more dimensions than PostgreSQL allows", [[[[[[[1]]]]]]]],
+  ];
+
+  for (const [label, value] of refused) {
+    it(`refuses ${label}, without naming the value`, () => {
+      const error = syncThrows(() => encodeModuleDatabaseParameters(["fine", value]));
+      expect(isModuleDatabaseError(error)).toBe(true);
+      expect(error).toMatchObject({ code: "MODULE_DATABASE_PARAMETER_INVALID" });
+      expect((error as Error).message).not.toMatch(/fine|1970|Point|Symbol/u);
+    });
+  }
+
+  it("accepts exactly PostgreSQL's six array dimensions", () => {
+    expect(encodeModuleDatabaseParameters([[[[[[[1]]]]]]])).toEqual(['{{{{{{"1"}}}}}}']);
+  });
+
+  it("refuses a values list that is not an array, or longer than the protocol allows", () => {
+    for (const values of [
+      "x",
+      { 0: "x", length: 1 },
+      new Array(MODULE_DATABASE_MAX_PARAMETERS + 1).fill(1),
+    ]) {
+      const error = syncThrows(() => encodeModuleDatabaseParameters(values));
+      expect(error).toMatchObject({ code: "MODULE_DATABASE_PARAMETER_INVALID" });
+    }
+    expect(
+      encodeModuleDatabaseParameters(new Array(MODULE_DATABASE_MAX_PARAMETERS).fill(1)),
+    ).toHaveLength(MODULE_DATABASE_MAX_PARAMETERS);
+  });
+
+  it("refuses a self-referencing array instead of recursing forever", () => {
+    const cyclic: unknown[] = [];
+    cyclic.push(cyclic);
+    expect(syncThrows(() => encodeModuleDatabaseParameters([cyclic]))).toMatchObject({
+      code: "MODULE_DATABASE_PARAMETER_INVALID",
+    });
+  });
+});
+
+// --- Results -----------------------------------------------------------------------------------
+
+describe("decodeModuleDatabaseValue", () => {
+  it("decodes the scalar types the table names, and keeps everything else as exact text", () => {
+    expect(decodeModuleDatabaseValue(16, "t")).toBe(true);
+    expect(decodeModuleDatabaseValue(16, "f")).toBe(false);
+    expect(decodeModuleDatabaseValue(21, "-32768")).toBe(-32_768);
+    expect(decodeModuleDatabaseValue(23, "2147483647")).toBe(2_147_483_647);
+    expect(decodeModuleDatabaseValue(26, "4294967295")).toBe(4_294_967_295);
+    expect(decodeModuleDatabaseValue(700, "1.5")).toBe(1.5);
+    expect(decodeModuleDatabaseValue(701, "NaN")).toBeNaN();
+    expect(decodeModuleDatabaseValue(701, "Infinity")).toBe(Number.POSITIVE_INFINITY);
+    expect(decodeModuleDatabaseValue(701, "-Infinity")).toBe(Number.NEGATIVE_INFINITY);
+    expect(decodeModuleDatabaseValue(701, "1e+300")).toBe(1e300);
+    // Precision-sensitive and zone-sensitive types stay exactly as PostgreSQL wrote them.
+    expect(decodeModuleDatabaseValue(20, "9223372036854775807")).toBe("9223372036854775807");
+    expect(decodeModuleDatabaseValue(1700, "0.1000000000000000000001")).toBe(
+      "0.1000000000000000000001",
+    );
+    expect(decodeModuleDatabaseValue(3802, '{"a": 12345678901234567890}')).toBe(
+      '{"a": 12345678901234567890}',
+    );
+    expect(decodeModuleDatabaseValue(1184, "2026-10-07 12:00:00+00")).toBe(
+      "2026-10-07 12:00:00+00",
+    );
+    // An unknown OID (an enum, a domain, an extension type) is text.
+    expect(decodeModuleDatabaseValue(987_654, "anything")).toBe("anything");
+  });
+
+  it("decodes bytea to a plain Uint8Array, from hex or the older escape form", () => {
+    const hex = decodeModuleDatabaseValue(17, "\\x00ff10");
+    expect(Object.getPrototypeOf(hex)).toBe(Uint8Array.prototype);
+    expect([...(hex as Uint8Array)]).toEqual([0, 255, 16]);
+    expect([...(decodeModuleDatabaseValue(17, "\\x") as Uint8Array)]).toEqual([]);
+    const escaped = decodeModuleDatabaseValue(17, "a\\000\\\\\\377");
+    expect([...(escaped as Uint8Array)]).toEqual([97, 0, 92, 255]);
+  });
+
+  it("decodes built-in arrays element by element", () => {
+    expect(decodeModuleDatabaseValue(1016, "{1,NULL,9223372036854775807}")).toEqual([
+      "1",
+      null,
+      "9223372036854775807",
+    ]);
+    expect(decodeModuleDatabaseValue(1231, "{1.10,2}")).toEqual(["1.10", "2"]);
+    expect(decodeModuleDatabaseValue(1000, "{t,f}")).toEqual([true, false]);
+    expect(decodeModuleDatabaseValue(1007, "{{1,2},{3,4}}")).toEqual([
+      [1, 2],
+      [3, 4],
+    ]);
+    const bytes = decodeModuleDatabaseValue(1001, '{"\\\\x00ff"}') as Uint8Array[];
+    expect([...(bytes[0] as Uint8Array)]).toEqual([0, 255]);
+    expect(decodeModuleDatabaseValue(1009, "{}")).toEqual([]);
+    // An array of a type the table does not know arrives as text, like the type itself.
+    expect(decodeModuleDatabaseValue(987_655, "{a,b}")).toBe("{a,b}");
+  });
+});
+
+describe("parsePostgresArrayText", () => {
+  const text = (value: string) => value;
+
+  it('honours quoting, escapes, and the difference between NULL and "NULL"', () => {
+    expect(parsePostgresArrayText('{"a\\"b","c,d",NULL,"NULL","","{}",null}', text)).toEqual([
+      'a"b',
+      "c,d",
+      null,
+      "NULL",
+      "",
+      "{}",
+      null,
+    ]);
+    expect(parsePostgresArrayText('{"back\\\\slash"}', text)).toEqual(["back\\slash"]);
+  });
+
+  it("drops a non-default lower bound: a JavaScript array is a zero-based list", () => {
+    expect(parsePostgresArrayText("[0:1]={5,6}", text)).toEqual(["5", "6"]);
+    expect(parsePostgresArrayText("[1:1][2:3]={{7,8}}", text)).toEqual([["7", "8"]]);
+  });
+
+  it("refuses text that is not an array literal", () => {
+    for (const malformed of ["", "{", "{1", '{"a', "{1}x", "[1:2]{1,2}", "1"]) {
+      expect(() => parsePostgresArrayText(malformed, text)).toThrow();
+    }
+  });
+});
+
+// --- The executor, over a scripted client -------------------------------------------------------
+
+interface ScriptedStatement {
+  readonly text: string;
+  readonly values?: readonly unknown[];
+}
+
+interface Script {
+  readonly pool: Pool;
+  readonly statements: ScriptedStatement[];
+  readonly released: (boolean | undefined)[];
+  /** Resolve a statement only when `release` is called, to model in-flight work. */
+  holdNext(): () => void;
+  failNext(error: unknown): void;
+  /** Fail the next statement whose text is exactly `text`. */
+  failWhen(text: string, error: unknown): void;
+  connectCount(): number;
+}
+
+function commandOf(text: string): string {
+  const word = /^\s*([A-Za-z]+)/u.exec(text)?.[1]?.toUpperCase() ?? "";
+  return word === "END" ? "COMMIT" : word;
+}
+
+/**
+ * A pool whose one client replays PostgreSQL's command tags and transaction status for simple SQL.
+ * It is not PostgreSQL: it exists only so the executor's bookkeeping can be observed.
+ */
+function scriptedPool(): Script {
+  const statements: ScriptedStatement[] = [];
+  const released: (boolean | undefined)[] = [];
+  let status = "I";
+  let connects = 0;
+  let hold: Promise<void> | undefined;
+  let failure: unknown;
+  const failures = new Map<string, unknown>();
+
+  const client = {
+    getTransactionStatus: () => status,
+    on: () => client,
+    removeListener: () => client,
+    async query(config: string | { text: string; values?: unknown[] }) {
+      const text = typeof config === "string" ? config : config.text;
+      statements.push(
+        typeof config === "string" ? { text } : { text, values: config.values ?? [] },
+      );
+      const held = hold;
+      hold = undefined;
+      if (held !== undefined) {
+        await held;
+      }
+      if (failure !== undefined || failures.has(text)) {
+        const error = failure ?? failures.get(text);
+        failure = undefined;
+        failures.delete(text);
+        if (status === "T") {
+          status = "E";
+        }
+        throw error;
+      }
+      const command = commandOf(text);
+      if (command === "BEGIN" || command === "START") {
+        status = "T";
+      } else if (command === "COMMIT" || (command === "ROLLBACK" && !/\bTO\b/iu.test(text))) {
+        const aborted = status === "E";
+        status = "I";
+        return { command: aborted ? "ROLLBACK" : command, fields: [], rowCount: null, rows: [] };
+      }
+      return {
+        command,
+        fields: [{ dataTypeID: 23, name: "n" }],
+        rowCount: 1,
+        rows: [["1"]],
+      };
+    },
+    release: (destroy?: boolean) => {
+      released.push(destroy);
+    },
+  };
+
+  return {
+    connectCount: () => connects,
+    failNext(error) {
+      failure = error;
+    },
+    failWhen(text, error) {
+      failures.set(text, error);
+    },
+    holdNext() {
+      let release!: () => void;
+      hold = new Promise<void>((resolve) => {
+        release = resolve;
+      });
+      return release;
+    },
+    pool: {
+      connect: vi.fn(async () => {
+        connects += 1;
+        return client;
+      }),
+    } as unknown as Pool,
+    released,
+    statements,
+  };
+}
+
+function pgError(code: string): DatabaseError {
+  const error = new DatabaseError(
+    'duplicate key value violates unique constraint "example_secret_key"',
+    100,
+    "error",
+  );
+  error.code = code;
+  error.detail = "Key (secret)=(hunter2) already exists.";
+  error.hint = "a hint";
+  error.table = "example_records";
+  error.constraint = "example_secret_key";
+  return error;
+}
+
+const pin =
+  "SET TimeZone TO 'UTC'; SET DateStyle TO 'ISO, MDY'; SET IntervalStyle TO 'postgres'; SET bytea_output TO 'hex'; SET extra_float_digits TO 1";
+
+function texts(script: Script): string[] {
+  return script.statements.map((statement) => statement.text);
+}
+
+describe("createModuleDatabaseExecutor", () => {
+  it("builds a frozen executor holding exactly the ABI's members, without touching the pool", () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+
+    expect(Object.keys(executor).sort()).toEqual(["abiVersion", "query", "transaction"]);
+    expect(executor.abiVersion).toBe(1);
+    expect(Object.isFrozen(executor)).toBe(true);
+    expect(Object.getPrototypeOf(executor)).toBe(Object.prototype);
+    for (const forbidden of ["pool", "client", "$client", "_", "session", "dialect", "select"]) {
+      expect(forbidden in executor).toBe(false);
+    }
+    expect(script.connectCount()).toBe(0);
+  });
+
+  it("carries its module for Core's attribution, and refuses an invalid module ID", () => {
+    const executor = createModuleDatabaseExecutor(scriptedPool().pool, { moduleId: "care-team" });
+    expect(moduleDatabaseExecutorModuleId(executor)).toBe("care-team");
+    expect(moduleDatabaseExecutorModuleId({})).toBeUndefined();
+    expect(() =>
+      createModuleDatabaseExecutor(scriptedPool().pool, { moduleId: "Not A Module" }),
+    ).toThrow(TypeError);
+  });
+
+  it("pins the session, runs one extended-protocol statement, and resets before releasing", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+
+    const result = await executor.query({ text: "SELECT 1 AS n", values: [5n] });
+
+    expect(result).toEqual({
+      command: "SELECT",
+      fields: [{ name: "n", typeOid: 23 }],
+      rowCount: 1,
+      rows: [{ n: 1 }],
+    });
+    expect(texts(script)).toEqual([pin, "SELECT 1 AS n", "DISCARD ALL"]);
+    expect(script.statements[1]).toEqual({ text: "SELECT 1 AS n", values: ["5"] });
+    expect(script.released).toEqual([undefined]);
+    expect(Object.isFrozen(result)).toBe(true);
+    expect(Object.isFrozen(result.rows)).toBe(true);
+    expect(Object.isFrozen(result.fields)).toBe(true);
+  });
+
+  it("refuses a malformed request before borrowing a connection", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    const query = executor.query as (request: unknown) => Promise<unknown>;
+
+    for (const request of [
+      undefined,
+      null,
+      "SELECT 1",
+      [],
+      { text: "" },
+      { text: 1 },
+      { text: "SELECT 1", rowMode: "rows" },
+      { text: "SELECT 1", name: "prepared" },
+      { text: "SELECT 1", types: [] },
+    ]) {
+      await expectAbiError(query(request), "MODULE_DATABASE_REQUEST_INVALID");
+    }
+    await expectAbiError(
+      query({ text: "SELECT $1", values: [new Date()] }),
+      "MODULE_DATABASE_PARAMETER_INVALID",
+    );
+    expect(script.connectCount()).toBe(0);
+  });
+
+  it("reports only PostgreSQL's SQLSTATE from a database error, never its text", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    script.failWhen("SELECT 1", pgError("23505"));
+    const error = await rejection(executor.query({ text: "SELECT 1" }));
+
+    expect(error).toMatchObject({ code: "MODULE_DATABASE_QUERY_FAILED", sqlState: "23505" });
+    const serialized = `${JSON.stringify(error)} ${String(error)} ${(error as Error).stack}`;
+    for (const secret of [
+      "hunter2",
+      "example_secret_key",
+      "example_records",
+      "duplicate",
+      "hint",
+    ]) {
+      expect(serialized).not.toContain(secret);
+    }
+    expect((error as Error).cause).toBeUndefined();
+    // A PostgreSQL error leaves the connection usable, so it is reset and returned.
+    expect(script.released).toEqual([undefined]);
+  });
+
+  it("drops a non-PostgreSQL failure's code and destroys the connection it happened on", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    script.failWhen(
+      "SELECT 1",
+      Object.assign(new Error("Connection terminated: postgres://u:p@h/db"), { code: "EPIPE" }),
+    );
+
+    const error = await rejection(executor.query({ text: "SELECT 1" }));
+    expect(error).toMatchObject({ code: "MODULE_DATABASE_QUERY_FAILED" });
+    expect((error as { sqlState?: string }).sqlState).toBeUndefined();
+    expect(JSON.stringify(error)).not.toContain("postgres://");
+    expect(script.released).toEqual([true]);
+  });
+
+  it("refuses a top-level transaction-control statement and destroys a connection it left open", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+
+    await expectAbiError(executor.query({ text: "BEGIN" }), "MODULE_DATABASE_REQUEST_INVALID");
+    expect(script.released).toEqual([true]);
+    expect(texts(script)).not.toContain("DISCARD ALL");
+  });
+});
+
+describe("transaction options", () => {
+  const invalid: readonly unknown[] = [
+    null,
+    "serializable",
+    [],
+    { isolation: "read uncommitted" },
+    { isolation: "SERIALIZABLE" },
+    { isolation: "constructor" },
+    { readOnly: "yes" },
+    { readOnly: 1 },
+    { deferrable: true },
+    { isolation: "serializable", retries: 3 },
+  ];
+
+  for (const options of invalid) {
+    it(`refuses ${JSON.stringify(options)} before borrowing a connection`, async () => {
+      const script = scriptedPool();
+      const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+      const callback = vi.fn();
+      await expectAbiError(
+        executor.transaction(callback, options as never),
+        "MODULE_DATABASE_TRANSACTION_OPTION_INVALID",
+      );
+      expect(callback).not.toHaveBeenCalled();
+      expect(script.connectCount()).toBe(0);
+    });
+  }
+
+  it("refuses a callback that is not a function", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    await expectAbiError(
+      executor.transaction("SELECT 1" as never),
+      "MODULE_DATABASE_REQUEST_INVALID",
+    );
+    expect(script.connectCount()).toBe(0);
+  });
+
+  it("begins every transaction with an explicit isolation level and access mode", async () => {
+    const cases: readonly [unknown, string][] = [
+      [undefined, "BEGIN ISOLATION LEVEL READ COMMITTED READ WRITE"],
+      [{}, "BEGIN ISOLATION LEVEL READ COMMITTED READ WRITE"],
+      [{ readOnly: true }, "BEGIN ISOLATION LEVEL READ COMMITTED READ ONLY"],
+      [{ isolation: "repeatable read" }, "BEGIN ISOLATION LEVEL REPEATABLE READ READ WRITE"],
+      [
+        { isolation: "serializable", readOnly: false },
+        "BEGIN ISOLATION LEVEL SERIALIZABLE READ WRITE",
+      ],
+    ];
+    for (const [options, begin] of cases) {
+      const script = scriptedPool();
+      const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+      await executor.transaction(async () => undefined, options as never);
+      expect(texts(script)).toEqual([pin, begin, "COMMIT", "DISCARD ALL"]);
+    }
+  });
+});
+
+describe("transaction scopes", () => {
+  it("commits a resolved callback and returns its value", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+
+    const value = await executor.transaction(async (tx) => {
+      expect(Object.keys(tx).sort()).toEqual(["abiVersion", "query", "savepoint"]);
+      expect(Object.isFrozen(tx)).toBe(true);
+      expect(moduleDatabaseExecutorModuleId(tx)).toBe("example");
+      await tx.query({ text: "INSERT INTO example_records VALUES (1)" });
+      return "done";
+    });
+
+    expect(value).toBe("done");
+    expect(texts(script).slice(1)).toEqual([
+      "BEGIN ISOLATION LEVEL READ COMMITTED READ WRITE",
+      "INSERT INTO example_records VALUES (1)",
+      "COMMIT",
+      "DISCARD ALL",
+    ]);
+  });
+
+  it("rolls back a rejected callback and rejects with the callback's own error, untouched", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    const own = new Error("module failure");
+
+    const error = await rejection(
+      executor.transaction(async (tx) => {
+        await tx.query({ text: "INSERT INTO example_records VALUES (1)" });
+        throw own;
+      }),
+    );
+
+    expect(error).toBe(own);
+    expect(texts(script)).toContain("ROLLBACK");
+    expect(texts(script)).not.toContain("COMMIT");
+  });
+
+  it("revokes the executor when the callback settles; later use sends nothing", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    let escaped: ModuleDatabaseTransaction | undefined;
+    await executor.transaction((tx) => {
+      escaped = tx;
+    });
+    const sent = script.statements.length;
+
+    await expectAbiError(
+      (escaped as ModuleDatabaseTransaction).query({ text: "SELECT 1" }),
+      "MODULE_DATABASE_SCOPE_CLOSED",
+    );
+    await expectAbiError(
+      (escaped as ModuleDatabaseTransaction).savepoint(async () => undefined),
+      "MODULE_DATABASE_SCOPE_CLOSED",
+    );
+    expect(script.statements).toHaveLength(sent);
+  });
+
+  it("never commits a callback that returned with a query still outstanding, even once it succeeds", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    let forgotten: Promise<unknown> | undefined;
+    let releaseHeld: (() => void) | undefined;
+
+    const outcome = executor.transaction((tx) => {
+      releaseHeld = script.holdNext();
+      forgotten = tx.query({ text: "INSERT INTO example_records VALUES (1)" });
+    });
+    await vi.waitFor(() => expect(releaseHeld).toBeDefined());
+    // Core waits for the started statement to settle before rolling back the connection.
+    await new Promise((resolve) => setTimeout(resolve, 10));
+    expect(texts(script)).not.toContain("ROLLBACK");
+    releaseHeld?.();
+
+    await expectAbiError(outcome, "MODULE_DATABASE_SCOPE_WORK_OUTSTANDING");
+    await expect(forgotten).resolves.toBeDefined();
+    expect(texts(script).slice(-2)).toEqual(["ROLLBACK", "DISCARD ALL"]);
+    expect(texts(script)).not.toContain("COMMIT");
+  });
+
+  it("keeps a rejected callback's own error when sibling work is still settling, and still never commits", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    const own = new Error("module failure");
+    let releaseHeld: (() => void) | undefined;
+
+    const outcome = executor.transaction(async (tx) => {
+      releaseHeld = script.holdNext();
+      void tx.query({ text: "INSERT INTO example_records VALUES (1)" });
+      throw own;
+    });
+    await vi.waitFor(() => expect(releaseHeld).toBeDefined());
+    // The sibling statement is drained before Core rolls back.
+    await new Promise((resolve) => setTimeout(resolve, 10));
+    expect(texts(script)).not.toContain("ROLLBACK");
+    releaseHeld?.();
+
+    expect(await rejection(outcome)).toBe(own);
+    expect(texts(script).slice(-2)).toEqual(["ROLLBACK", "DISCARD ALL"]);
+    expect(texts(script)).not.toContain("COMMIT");
+  });
+
+  it("refuses a transaction-control statement inside a transaction and never commits it", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+
+    const error = await rejection(
+      executor.transaction(async (tx) => {
+        await expectAbiError(
+          tx.query({ text: "SAVEPOINT mine" }),
+          "MODULE_DATABASE_REQUEST_INVALID",
+        );
+        return "carried on";
+      }),
+    );
+
+    expect(error).toMatchObject({ code: "MODULE_DATABASE_REQUEST_INVALID" });
+    expect(texts(script)).not.toContain("COMMIT");
+    expect(texts(script)).toContain("ROLLBACK");
+    // The connection is destroyed, never reset and reused.
+    expect(texts(script)).not.toContain("DISCARD ALL");
+    expect(script.released).toEqual([true]);
+  });
+
+  it("reports a COMMIT that PostgreSQL answered with ROLLBACK as a failed transaction", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+
+    const outcome = executor.transaction(async (tx) => {
+      script.failNext(pgError("22012"));
+      await expectAbiError(
+        tx.query({ text: "SELECT 1/0" }),
+        "MODULE_DATABASE_QUERY_FAILED",
+        "22012",
+      );
+    });
+
+    await expectAbiError(outcome, "MODULE_DATABASE_TRANSACTION_FAILED");
+  });
+});
+
+describe("savepoint scopes", () => {
+  it("names savepoints itself, releases a resolved one, and rolls back a rejected one", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    const own = new Error("savepoint failure");
+
+    await executor.transaction(async (tx) => {
+      await tx.savepoint(async (sp) => {
+        await sp.query({ text: "INSERT INTO example_records VALUES (1)" });
+      });
+      expect(await rejection(tx.savepoint(async () => Promise.reject(own)))).toBe(own);
+    });
+
+    expect(texts(script).slice(2, -2)).toEqual([
+      "SAVEPOINT ekklesia_savepoint_1",
+      "INSERT INTO example_records VALUES (1)",
+      "RELEASE SAVEPOINT ekklesia_savepoint_1",
+      "SAVEPOINT ekklesia_savepoint_2",
+      "ROLLBACK TO SAVEPOINT ekklesia_savepoint_2",
+      "RELEASE SAVEPOINT ekklesia_savepoint_2",
+    ]);
+  });
+
+  it("makes the parent inactive while a savepoint is open, so scopes cannot overlap", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+
+    await executor.transaction(async (tx) => {
+      await tx.savepoint(async (sp) => {
+        await expectAbiError(tx.query({ text: "SELECT 1" }), "MODULE_DATABASE_SCOPE_INACTIVE");
+        await expectAbiError(
+          tx.savepoint(async () => undefined),
+          "MODULE_DATABASE_SCOPE_INACTIVE",
+        );
+        await sp.savepoint(async (inner) => {
+          await expectAbiError(sp.query({ text: "SELECT 1" }), "MODULE_DATABASE_SCOPE_INACTIVE");
+          await inner.query({ text: "SELECT 2" });
+        });
+        await sp.query({ text: "SELECT 3" });
+      });
+      await tx.query({ text: "SELECT 4" });
+    });
+
+    expect(texts(script)).toContain("SAVEPOINT ekklesia_savepoint_2");
+    expect(texts(script)).toContain("COMMIT");
+  });
+
+  it("revokes an escaped savepoint executor", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+
+    await executor.transaction(async (tx) => {
+      let escaped: ModuleDatabaseTransaction | undefined;
+      await tx.savepoint((sp) => {
+        escaped = sp;
+      });
+      await expectAbiError(
+        (escaped as ModuleDatabaseTransaction).query({ text: "SELECT 1" }),
+        "MODULE_DATABASE_SCOPE_CLOSED",
+      );
+      await tx.query({ text: "SELECT 2" });
+    });
+    expect(texts(script)).toContain("COMMIT");
+  });
+
+  it("rolls back, and never releases, a savepoint whose callback left work outstanding", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+
+    await executor.transaction(async (tx) => {
+      await expectAbiError(
+        tx.savepoint((sp) => {
+          const release = script.holdNext();
+          void sp.query({ text: "INSERT INTO example_records VALUES (1)" });
+          setTimeout(release, 10);
+        }),
+        "MODULE_DATABASE_SCOPE_WORK_OUTSTANDING",
+      );
+    });
+
+    expect(texts(script).slice(2, -2)).toEqual([
+      "SAVEPOINT ekklesia_savepoint_1",
+      "INSERT INTO example_records VALUES (1)",
+      "ROLLBACK TO SAVEPOINT ekklesia_savepoint_1",
+    ]);
+  });
+
+  it("keeps a rejected savepoint callback's own error, rolling back and releasing after its sibling work settles", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    const own = new Error("savepoint failure");
+
+    await executor.transaction(async (tx) => {
+      const error = await rejection(
+        tx.savepoint(async (sp) => {
+          const release = script.holdNext();
+          void sp.query({ text: "INSERT INTO example_records VALUES (1)" });
+          setTimeout(release, 10);
+          throw own;
+        }),
+      );
+      expect(error).toBe(own);
+    });
+
+    expect(texts(script).slice(2, -2)).toEqual([
+      "SAVEPOINT ekklesia_savepoint_1",
+      "INSERT INTO example_records VALUES (1)",
+      "ROLLBACK TO SAVEPOINT ekklesia_savepoint_1",
+      "RELEASE SAVEPOINT ekklesia_savepoint_1",
+    ]);
+    expect(texts(script)).toContain("COMMIT");
+  });
+
+  it("counts an unawaited savepoint as the transaction's outstanding work", async () => {
+    const script = scriptedPool();
+    const executor = createModuleDatabaseExecutor(script.pool, { moduleId: "example" });
+    let forgotten: Promise<unknown> | undefined;
+
+    await expectAbiError(
+      executor.transaction((tx) => {
+        forgotten = tx.savepoint(async (sp) => {
+          await sp.query({ text: "INSERT INTO example_records VALUES (1)" });
+        });
+      }),
+      "MODULE_DATABASE_SCOPE_WORK_OUTSTANDING",
+    );
+    await expectAbiError(forgotten as Promise<unknown>, "MODULE_DATABASE_SCOPE_CLOSED");
+    expect(texts(script)).not.toContain("COMMIT");
+    expect(texts(script).filter((text) => text.startsWith("RELEASE"))).toEqual([]);
+    expect(texts(script).at(-1)).toBe("DISCARD ALL");
+  });
+});
+
+describe("the ABI's own sources", () => {
+  it("import no ORM, query builder, or ORM type", async () => {
+    for (const file of [
+      "../src/modules/database-abi.ts",
+      "../src/modules/database-abi-values.ts",
+    ]) {
+      const source = await readFile(new URL(file, import.meta.url), "utf8");
+      const specifiers = [...source.matchAll(/\bfrom\s+"([^"]+)"/gu)].map((match) => match[1]);
+      expect(
+        specifiers.every((specifier) =>
+          ["@ekklesia/contracts", "pg", "./database-abi-values.js"].includes(specifier ?? ""),
+        ),
+      ).toBe(true);
+      expect(source).not.toMatch(/drizzle|kysely|NodePg|PgTable|PgColumn/iu);
+    }
+  });
+});

core/tests/module-database-type.test.ts

@@ -1,8 +1,8 @@
 import { integer, pgTable, text } from "drizzle-orm/pg-core";
 import { describe, expect, it } from "vitest";
-import type { ModuleDatabase, ModuleRuntimeServices } from "../src/index.js";
+import type { LegacyModuleRuntimeServices, ModuleDatabase } from "../src/modules/database.js";
 
-const testTable = pgTable("contracts_module_database_test", {
+const testTable = pgTable("core_module_database_type_test", {
   id: integer("id").primaryKey(),
   name: text("name").notNull(),
 });
@@ -68,16 +68,17 @@ function typeOnlyExclusions(database: ModuleDatabase): void {
 }
 void typeOnlyExclusions;
 
-/** Never invoked — proves `ModuleRuntimeServices` has exactly one field, `database`, typed as
+/** Never invoked — proves a legacy module's `ModuleRuntimeServices` has exactly one field,
- * `ModuleDatabase`, with no storage/jobs/configuration/secrets/authorization field this phase. */
+ * `database`, typed as `ModuleDatabase`, with no storage/jobs/configuration/secrets/authorization
-function typeOnlyServicesShape(services: ModuleRuntimeServices): void {
+ * field this phase. */
+function typeOnlyServicesShape(services: LegacyModuleRuntimeServices): void {
   const database: ModuleDatabase = services.database;
   void database;
-  // @ts-expect-error `storage` does not exist on `ModuleRuntimeServices` yet.
+  // @ts-expect-error `storage` does not exist on the services yet.
   void services.storage;
-  // @ts-expect-error `jobs` does not exist on `ModuleRuntimeServices` yet.
+  // @ts-expect-error `jobs` does not exist on the services yet.
   void services.jobs;
-  // @ts-expect-error `authorization` does not exist on `ModuleRuntimeServices` yet.
+  // @ts-expect-error `authorization` does not exist on the services yet.
   void services.authorization;
 }
 void typeOnlyServicesShape;

core/tests/module-discovery.test.ts

@@ -34,7 +34,7 @@ async function createModulesDirectory(): Promise<string> {
 
 function manifestFor(id: string): Record<string, unknown> {
   return {
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "0.1.0",

core/tests/module-http-import.test.ts

@@ -1,4 +1,5 @@
 import { describe, expect, it, vi } from "vitest";
+import { IMPORT_SAFETY_TEST_TIMEOUT_MS } from "./support/import-safety.js";
 
 const readdir = vi.fn();
 const readFile = vi.fn();
@@ -14,13 +15,17 @@ vi.mock("node:fs/promises", async (importOriginal) => ({
 }));
 
 describe("module HTTP contract and runtime import safety", () => {
-  it("performs no filesystem I/O merely by importing the module runtime or the module-http contract", async () => {
+  it(
-    await import("../src/modules/index.js");
+    "performs no filesystem I/O merely by importing the module runtime or the module-http contract",
-    await import("@ekklesia/contracts");
+    async () => {
+      await import("../src/modules/index.js");
+      await import("@ekklesia/contracts");
 
-    expect(readdir).not.toHaveBeenCalled();
+      expect(readdir).not.toHaveBeenCalled();
-    expect(readFile).not.toHaveBeenCalled();
+      expect(readFile).not.toHaveBeenCalled();
-    expect(realpath).not.toHaveBeenCalled();
+      expect(realpath).not.toHaveBeenCalled();
-    expect(stat).not.toHaveBeenCalled();
+      expect(stat).not.toHaveBeenCalled();
-  });
+    },
+    IMPORT_SAFETY_TEST_TIMEOUT_MS,
+  );
 });

core/tests/module-lifecycle-store.integration.ts

@@ -200,7 +200,7 @@ afterAll(async () => {
  * by eligibility resolution. */
 function fakeModule(id: string, dependencies?: Record<string, unknown>): DiscoveredModule {
   const manifest = parseModuleManifest({
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "1.0.0",

core/tests/module-lifecycle.test.ts

@@ -22,7 +22,7 @@ function fakeModule(
   } = {},
 ): DiscoveredModule {
   const manifest = parseModuleManifest({
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "0.1.0",
@@ -344,7 +344,7 @@ describe("resolveModuleEligibility — over a real discovered inventory", () =>
       writeFile(
         path.join(moduleDirectory, "ekklesia.module.json"),
         JSON.stringify({
-          manifestVersion: 7,
+          manifestVersion: 8,
           id,
           name: `${id} module`,
           version: "0.1.0",

core/tests/module-migration-discovery.test.ts

@@ -1,5 +1,5 @@
 import { createHash } from "node:crypto";
-import { mkdir, mkdtemp, rm, symlink, writeFile } from "node:fs/promises";
+import { mkdtemp, rm, symlink, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import path from "node:path";
 import { afterEach, describe, expect, it } from "vitest";
@@ -10,34 +10,15 @@ import {
   ModuleMigrationDiscoveryError,
   type ModuleMigrationDiscoveryIssueCode,
 } from "../src/modules/index.js";
+import {
+  createMigrationModule,
+  manifestFor,
+  originSnapshotId,
+  snapshotId,
+} from "./support/migration-module-fixture.js";
 
-const originSnapshotId = "00000000-0000-0000-0000-000000000000";
 const temporaryDirectories: string[] = [];
 
-interface MigrationFixture {
-  readonly breakpoints?: boolean;
-  readonly destructive?:
-    | { readonly mode: "none" }
-    | { readonly mode: "approval-required"; readonly reason: string };
-  readonly snapshotId?: string;
-  readonly sql: string | Uint8Array;
-  readonly tag: string;
-  readonly timestamp?: number;
-}
-
-interface MigrationModuleFixture {
-  readonly dependencies?: Record<string, unknown>;
-  readonly manifest?: Record<string, unknown>;
-  readonly migrations?: readonly MigrationFixture[] | false;
-  readonly schemaSource?: string;
-  readonly serverSource?: string;
-}
-
-interface CreatedMigrationModule {
-  readonly migrationDirectory?: string;
-  readonly moduleDirectory: string;
-}
-
 afterEach(async () => {
   await Promise.all(
     temporaryDirectories
@@ -52,144 +33,11 @@ async function createModulesDirectory(): Promise<string> {
   return directory;
 }
 
-function snapshotId(index: number): string {
-  return `10000000-0000-4000-8000-${(index + 1).toString(16).padStart(12, "0")}`;
-}
-
-function manifestFor(
-  id: string,
-  options: {
-    readonly dependencies?: Record<string, unknown>;
-    readonly migrations?: boolean;
-    readonly schema?: boolean;
-  } = {},
-): Record<string, unknown> {
-  return {
-    manifestVersion: 7,
-    id,
-    name: `${id} module`,
-    version: "0.1.0",
-    compatibility: { platform: "^0.1.0", moduleSdk: "^0.1.0" },
-    ...(options.dependencies ? { dependencies: options.dependencies } : {}),
-    capabilities: [],
-    permissions: [],
-    entrypoints: {
-      server: "./dist/server/index.js",
-      ...(options.schema ? { schema: "./dist/schema/index.js" } : {}),
-      ...(options.migrations === false ? {} : { migrations: "./drizzle" }),
-    },
-  };
-}
-
-function defaultMigrations(id: string): readonly MigrationFixture[] {
-  return [
-    {
-      sql: `CREATE TABLE "${id.replaceAll("-", "_")}_records" ("id" integer);\n`,
-      tag: "0000_initial",
-    },
-  ];
-}
-
-async function createMigrationModule(
-  modulesDirectory: string,
-  id: string,
-  fixture: MigrationModuleFixture = {},
-): Promise<CreatedMigrationModule> {
-  const migrations =
-    fixture.migrations === false ? undefined : (fixture.migrations ?? defaultMigrations(id));
-  const moduleDirectory = path.join(modulesDirectory, id);
-  const migrationDirectory = migrations ? path.join(moduleDirectory, "drizzle") : undefined;
-  await mkdir(path.join(moduleDirectory, "dist/server"), { recursive: true });
-  if (fixture.schemaSource !== undefined) {
-    await mkdir(path.join(moduleDirectory, "dist/schema"), { recursive: true });
-  }
-  if (migrationDirectory) {
-    await mkdir(path.join(migrationDirectory, "meta"), { recursive: true });
-  }
-
-  await Promise.all([
-    writeFile(
-      path.join(moduleDirectory, "package.json"),
-      JSON.stringify({
-        name: `@test/module-${id}`,
-        version: "0.1.0",
-        type: "module",
-        ekklesia: { layer: "module" },
-      }),
-    ),
-    writeFile(
-      path.join(moduleDirectory, "ekklesia.module.json"),
-      JSON.stringify(
-        fixture.manifest ??
-          manifestFor(id, {
-            ...(fixture.dependencies ? { dependencies: fixture.dependencies } : {}),
-            migrations: migrations !== undefined,
-            schema: fixture.schemaSource !== undefined,
-          }),
-      ),
-    ),
-    writeFile(
-      path.join(moduleDirectory, "dist/server/index.js"),
-      fixture.serverSource ?? `export default { id: ${JSON.stringify(id)}, version: "0.1.0" };`,
-    ),
-    ...(fixture.schemaSource === undefined
-      ? []
-      : [writeFile(path.join(moduleDirectory, "dist/schema/index.js"), fixture.schemaSource)]),
-  ]);
-
-  if (!migrationDirectory || !migrations) {
-    return { moduleDirectory };
-  }
-
-  const journalEntries = migrations.map((migration, index) => ({
-    idx: index,
-    version: "7",
-    when: migration.timestamp ?? 1_700_000_000_000 + index,
-    tag: migration.tag,
-    breakpoints: migration.breakpoints ?? true,
-  }));
-  const policyEntries = migrations.map((migration) => ({
-    tag: migration.tag,
-    destructive: migration.destructive ?? { mode: "none" },
-  }));
-  await Promise.all([
-    writeFile(
-      path.join(migrationDirectory, "meta/_journal.json"),
-      JSON.stringify({ version: "7", dialect: "postgresql", entries: journalEntries }),
-    ),
-    writeFile(
-      path.join(migrationDirectory, "meta/_ekklesia.json"),
-      JSON.stringify({ version: 1, moduleId: id, entries: policyEntries }),
-    ),
-    ...migrations.flatMap((migration, index) => {
-      const idForSnapshot = migration.snapshotId ?? snapshotId(index);
-      const previousId =
-        index === 0
-          ? originSnapshotId
-          : (migrations[index - 1]?.snapshotId ?? snapshotId(index - 1));
-      return [
-        writeFile(path.join(migrationDirectory, `${migration.tag}.sql`), migration.sql),
-        writeFile(
-          path.join(migrationDirectory, `meta/${index.toString().padStart(4, "0")}_snapshot.json`),
-          JSON.stringify({
-            version: "7",
-            dialect: "postgresql",
-            id: idForSnapshot,
-            prevId: previousId,
-          }),
-        ),
-      ];
-    }),
-  ]);
-
-  return { migrationDirectory, moduleDirectory };
-}
-
 function discoveryOptions(modulesDirectory: string) {
   return {
-    moduleSdkVersion: "0.1.0",
+    moduleSdkVersion: "0.2.0",
     modulesDirectory,
-    platformVersion: "0.1.0",
+    platformVersion: "0.2.0",
   };
 }
 

core/tests/module-migration-runner.test.ts

@@ -13,6 +13,7 @@ import {
   type MigrationTransaction,
   planModuleMigrations,
 } from "../src/migrations/runner.js";
+import type { DiscoveredModule } from "../src/modules/discovery.js";
 import type {
   DiscoveredModuleMigration,
   ModuleMigrationAggregate,
@@ -323,6 +324,7 @@ describe("module migration planning", () => {
         },
       ],
       pendingCount: 1,
+      retained: [],
     });
     expect(database.events).toEqual(["session:open", "history:read", "session:close"]);
     expect(database.historyTableExists).toBe(false);
@@ -344,10 +346,11 @@ describe("module migration planning", () => {
       approvalRequiredCount: 0,
       entries: [],
       pendingCount: 0,
+      retained: [],
     });
     expect(Object.isFrozen(result)).toBe(true);
     expect(Object.isFrozen(result.entries)).toBe(true);
-    expect(applyResult).toEqual({ applied: [], appliedCount: 0, noOp: true });
+    expect(applyResult).toEqual({ applied: [], appliedCount: 0, noOp: true, retained: [] });
     expect(database.historyTableExists).toBe(false);
     expect(database.events).not.toContain("transaction:begin");
   });
@@ -548,6 +551,7 @@ describe("module migration apply", () => {
       ],
       appliedCount: 1,
       noOp: false,
+      retained: [],
     });
   });
 
@@ -580,7 +584,7 @@ describe("module migration apply", () => {
       database,
     });
 
-    expect(result).toEqual({ applied: [], appliedCount: 0, noOp: true });
+    expect(result).toEqual({ applied: [], appliedCount: 0, noOp: true, retained: [] });
     expect(Object.isFrozen(result)).toBe(true);
     expect(Object.isFrozen(result.applied)).toBe(true);
     expectNoPersistentMutation(database);
@@ -601,7 +605,7 @@ describe("module migration apply", () => {
       database,
     });
 
-    expect(result).toEqual({ applied: [], appliedCount: 0, noOp: true });
+    expect(result).toEqual({ applied: [], appliedCount: 0, noOp: true, retained: [] });
     expect(database.historyTableExists).toBe(false);
     expect(database.events).toEqual([
       "session:open",
@@ -980,3 +984,250 @@ describe("module migration failures and side effects", () => {
     expect(database.committedHistory).toEqual([]);
   });
 });
+
+/**
+ * Marks modules as present in the discovered inventory without giving them migrations, the way a
+ * real aggregate lists every discovered module whether or not it owns migration history. Only the
+ * manifest id is read by the runner.
+ */
+function withDiscovered(
+  inventory: ModuleMigrationAggregate,
+  ...moduleIds: readonly string[]
+): ModuleMigrationAggregate {
+  return Object.freeze({
+    ...inventory,
+    discoveredModules: Object.freeze(
+      moduleIds.map((id) => ({ manifest: { id } }) as unknown as DiscoveredModule),
+    ),
+  });
+}
+
+describe("retained history for absent modules (ADR 0048)", () => {
+  it("retains and reports an absent module's applied history without failing the plan", async () => {
+    const coreInitial = migration("core", 0);
+    const calendarInitial = migration("calendar", 0);
+    const calendarLater = migration("calendar", 1);
+    const history = [
+      historyRecord(coreInitial, 1),
+      historyRecord(calendarInitial, 2),
+      historyRecord(calendarLater, 3),
+    ];
+    const database = new FakeMigrationDatabase({ history });
+
+    const result = await planModuleMigrations({
+      aggregate: aggregate({ id: "core", migrations: [coreInitial] }),
+      database,
+    });
+
+    expect(result.appliedCount).toBe(1);
+    expect(result.pendingCount).toBe(0);
+    expect(result.entries.map((entry) => entry.identity)).toEqual([coreInitial.identity]);
+    expect(result.retained).toEqual([{ appliedCount: 2, moduleId: "calendar" }]);
+    expect(Object.isFrozen(result.retained)).toBe(true);
+    expect(Object.isFrozen(result.retained[0])).toBe(true);
+    expect(database.committedHistory).toEqual(history);
+    expectNoPersistentMutation(database);
+  });
+
+  it("applies a later Core migration while a module is absent, leaving its history intact", async () => {
+    const coreInitial = migration("core", 0);
+    const coreLater = migration("core", 1);
+    const calendarInitial = migration("calendar", 0);
+    const history = [historyRecord(coreInitial, 1), historyRecord(calendarInitial, 2)];
+    const database = new FakeMigrationDatabase({ history });
+
+    const result = await applyModuleMigrations({
+      aggregate: aggregate({ id: "core", migrations: [coreInitial, coreLater] }),
+      database,
+    });
+
+    expect(result.applied.map((applied) => applied.identity)).toEqual([coreLater.identity]);
+    expect(result.retained).toEqual([{ appliedCount: 1, moduleId: "calendar" }]);
+    expect(database.executedStatements).toEqual([coreLater.sql]);
+    expect(database.committedHistory.map((record) => record.identity)).toEqual([
+      coreInitial.identity,
+      calendarInitial.identity,
+      coreLater.identity,
+    ]);
+  });
+
+  it("applies a present module's migrations while another module is absent", async () => {
+    const peopleInitial = migration("people", 0);
+    const calendarInitial = migration("calendar", 0);
+    const database = new FakeMigrationDatabase({ history: [historyRecord(calendarInitial, 1)] });
+
+    const result = await applyModuleMigrations({
+      aggregate: aggregate({ id: "people", migrations: [peopleInitial] }),
+      database,
+    });
+
+    expect(result.applied.map((applied) => applied.identity)).toEqual([peopleInitial.identity]);
+    expect(result.retained).toEqual([{ appliedCount: 1, moduleId: "calendar" }]);
+  });
+
+  it("reports retained modules in a stable order with exact counts", async () => {
+    const zeta = [migration("zeta", 0), migration("zeta", 1), migration("zeta", 2)];
+    const alpha = migration("alpha", 0);
+    const database = new FakeMigrationDatabase({
+      history: [
+        historyRecord(zeta[0] as DiscoveredModuleMigration, 1),
+        historyRecord(alpha, 2),
+        historyRecord(zeta[1] as DiscoveredModuleMigration, 3),
+        historyRecord(zeta[2] as DiscoveredModuleMigration, 4),
+      ],
+    });
+
+    const result = await planModuleMigrations({ aggregate: aggregate(), database });
+
+    expect(result.retained).toEqual([
+      { appliedCount: 1, moduleId: "alpha" },
+      { appliedCount: 3, moduleId: "zeta" },
+    ]);
+  });
+
+  it("returns a module to strict validation: valid history plans cleanly and nothing is retained", async () => {
+    const initial = migration("people", 0);
+    const later = migration("people", 1);
+    const database = new FakeMigrationDatabase({ history: [historyRecord(initial, 1)] });
+
+    const result = await planModuleMigrations({
+      aggregate: aggregate({ id: "people", migrations: [initial, later] }),
+      database,
+    });
+
+    expect(result.retained).toEqual([]);
+    expect(result.entries.map((entry) => [entry.identity, entry.status])).toEqual([
+      [initial.identity, "applied"],
+      [later.identity, "pending"],
+    ]);
+  });
+
+  it("fails when a returning module no longer ships a previously applied migration", async () => {
+    const initial = migration("people", 0);
+    const later = migration("people", 1);
+    const database = new FakeMigrationDatabase({
+      history: [historyRecord(initial, 1), historyRecord(later, 2)],
+    });
+    const downgraded = aggregate({ id: "people", migrations: [initial] });
+
+    await captureRunnerError(
+      planModuleMigrations({ aggregate: downgraded, database }),
+      "MIGRATION_UNKNOWN_APPLIED",
+    );
+    await captureRunnerError(
+      applyModuleMigrations({ aggregate: downgraded, database }),
+      "MIGRATION_UNKNOWN_APPLIED",
+    );
+    expect(database.executedStatements).toEqual([]);
+  });
+
+  it("fails when a returning module's applied migration has different contents", async () => {
+    const initial = migration("people", 0);
+    const database = new FakeMigrationDatabase({ history: [historyRecord(initial, 1)] });
+    const edited = aggregate({
+      id: "people",
+      migrations: [migration("people", 0, { sql: "SELECT 'edited';\n" })],
+    });
+
+    const error = await captureRunnerError(
+      planModuleMigrations({ aggregate: edited, database }),
+      "MIGRATION_CHECKSUM_MISMATCH",
+    );
+    expect(error.migrationIdentity).toBe(initial.identity);
+  });
+
+  it("fails when a returning module's history is no longer a prefix of its journal", async () => {
+    const initial = migration("people", 0);
+    const later = migration("people", 1);
+    const database = new FakeMigrationDatabase({ history: [historyRecord(later, 1)] });
+
+    await captureRunnerError(
+      planModuleMigrations({
+        aggregate: aggregate({ id: "people", migrations: [initial, later] }),
+        database,
+      }),
+      "MIGRATION_HISTORY_INVALID",
+    );
+  });
+
+  it("keeps a present module that no longer ships any migrations strict", async () => {
+    const initial = migration("people", 0);
+    const database = new FakeMigrationDatabase({ history: [historyRecord(initial, 1)] });
+
+    await captureRunnerError(
+      planModuleMigrations({ aggregate: withDiscovered(aggregate(), "people"), database }),
+      "MIGRATION_UNKNOWN_APPLIED",
+    );
+  });
+
+  it("never treats Core's history as an absent module's", async () => {
+    const coreInitial = migration("core", 0);
+    const coreGhost = migration("core", 1);
+
+    // An inventory with no Core source at all: Core's rows are still strict, never retained.
+    await captureRunnerError(
+      planModuleMigrations({
+        aggregate: aggregate({ id: "people", migrations: [] }),
+        database: new FakeMigrationDatabase({ history: [historyRecord(coreInitial, 1)] }),
+      }),
+      "MIGRATION_UNKNOWN_APPLIED",
+    );
+    // A Core row missing from Core's own inventory.
+    await captureRunnerError(
+      planModuleMigrations({
+        aggregate: aggregate({ id: "core", migrations: [coreInitial] }),
+        database: new FakeMigrationDatabase({
+          history: [historyRecord(coreInitial, 1), historyRecord(coreGhost, 2)],
+        }),
+      }),
+      "MIGRATION_UNKNOWN_APPLIED",
+    );
+  });
+
+  it.each([
+    [
+      "an identity that does not name its own module and tag",
+      (source: DiscoveredModuleMigration) => [
+        historyRecord(source, 1, { identity: "calendar:0099_elsewhere" }),
+      ],
+    ],
+    [
+      "a duplicate applied order",
+      (source: DiscoveredModuleMigration) => [
+        historyRecord(source, 1),
+        historyRecord(migration("calendar", 1), 1),
+      ],
+    ],
+    [
+      "a duplicate index",
+      (source: DiscoveredModuleMigration) => [
+        historyRecord(source, 1),
+        historyRecord(migration("calendar", 1), 2, { index: 0 }),
+      ],
+    ],
+  ])("still rejects retained rows with %s", async (_label, makeHistory) => {
+    const database = new FakeMigrationDatabase({
+      history: makeHistory(migration("calendar", 0)),
+    });
+
+    await captureRunnerError(
+      planModuleMigrations({ aggregate: aggregate(), database }),
+      "MIGRATION_HISTORY_INVALID",
+    );
+  });
+
+  it("rejects a retained row that claims a present module's migration identity", async () => {
+    const peopleInitial = migration("people", 0);
+    const database = new FakeMigrationDatabase({
+      history: [historyRecord(peopleInitial, 1, { moduleId: "calendar" })],
+    });
+
+    await captureRunnerError(
+      planModuleMigrations({
+        aggregate: aggregate({ id: "people", migrations: [peopleInitial] }),
+        database,
+      }),
+      "MIGRATION_HISTORY_INVALID",
+    );
+  });
+});

core/tests/module-package-verification.test.ts

@@ -0,0 +1,748 @@
+import { mkdir, mkdtemp, readdir, rm, stat, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import {
+  currentModulePackageHost,
+  type ModulePackageHost,
+  ModulePackageVerificationError,
+  type ModulePackageVerificationErrorCode,
+  verifyModulePackage,
+} from "../src/modules/index.js";
+import {
+  type FixtureEntry,
+  modulePackageFixture,
+  type PackageFixtureOptions,
+  sha256,
+} from "./support/module-package-fixture.js";
+
+const platform = {
+  databaseRuntime: { "drizzle-orm": "0.45.2" },
+  moduleSdkVersion: "0.2.0",
+  platformVersion: "0.2.0",
+} as const;
+
+const temporaryDirectories: string[] = [];
+
+afterEach(async () => {
+  await Promise.all(
+    temporaryDirectories
+      .splice(0)
+      .map((directory) => rm(directory, { force: true, recursive: true })),
+  );
+});
+
+async function scratch(): Promise<string> {
+  const directory = await mkdtemp(path.join(tmpdir(), "ekklesia-verify-"));
+  temporaryDirectories.push(directory);
+  return directory;
+}
+
+async function archiveFile(options: PackageFixtureOptions = {}): Promise<{
+  readonly archivePath: string;
+  readonly sha256: string;
+}> {
+  const fixture = await modulePackageFixture(options);
+  const archivePath = path.join(await scratch(), "private-host-name-5e1d.tar.gz");
+  await writeFile(archivePath, fixture.archive);
+  return { archivePath, sha256: fixture.sha256 };
+}
+
+async function executionScratch(): Promise<string> {
+  const directory = path.join(await scratch(), "execution");
+  await mkdir(directory);
+  return directory;
+}
+
+async function rejection(
+  options: PackageFixtureOptions,
+  code: ModulePackageVerificationErrorCode,
+  extra: { readonly expectedSha256?: string } = {},
+): Promise<ModulePackageVerificationError> {
+  const { archivePath } = await archiveFile(options);
+  try {
+    await verifyModulePackage({ archivePath, platform, ...extra });
+  } catch (error) {
+    expect(error).toBeInstanceOf(ModulePackageVerificationError);
+    const verificationError = error as ModulePackageVerificationError;
+    expect(verificationError.code).toBe(code);
+    // Sanitized: never the archive's location, a temporary directory, or text from inside it.
+    const rendered = JSON.stringify({ ...verificationError, message: verificationError.message });
+    expect(rendered).not.toContain("private-host-name-5e1d");
+    expect(rendered).not.toContain(tmpdir());
+    expect(rendered).not.toContain("attacker-chosen");
+    return verificationError;
+  }
+  throw new Error(`Expected ${code}.`);
+}
+
+function withEntry(entry: FixtureEntry): PackageFixtureOptions {
+  return { extraEntries: [entry] };
+}
+
+function abiPackage(overrides: PackageFixtureOptions = {}): PackageFixtureOptions {
+  return {
+    manifest: (manifest) => ({ ...manifest, database: { abi: 1 } }),
+    schemaSource: `export default {
+      moduleId: "example",
+      tables: [{ name: "example_records", foreignKeys: [] }]
+    };\n`,
+    serverSource:
+      'export default { database: { abi: 1 }, id: "example", version: "0.1.0", register() {} };\n',
+    ...overrides,
+  };
+}
+
+describe("Module Package v1 verification (ADR 0049)", () => {
+  it("verifies a valid any-target package, its digest, and its module", async () => {
+    const { archivePath, sha256: digest } = await archiveFile();
+    const result = await verifyModulePackage({ archivePath, expectedSha256: digest, platform });
+    expect(result).toEqual({
+      archiveSha256: digest,
+      fileCount: 9,
+      moduleId: "example",
+      target: "any",
+      version: "0.1.0",
+    });
+  });
+
+  it("uses an explicit execution scratch for pure JavaScript and cleans concurrent runs", async () => {
+    const { archivePath } = await archiveFile();
+    const executionScratchDirectory = await executionScratch();
+    const runs = Array.from({ length: 4 }, () =>
+      verifyModulePackage({ archivePath, executionScratchDirectory, platform }),
+    );
+    await expect(Promise.all(runs)).resolves.toHaveLength(4);
+    expect(await readdir(executionScratchDirectory)).toEqual([]);
+  });
+
+  it("cleans its execution scratch after a backend load failure", async () => {
+    const { archivePath } = await archiveFile({
+      serverSource:
+        'import "dependency-not-in-this-package";\nexport default { id: "example", version: "0.1.0" };\n',
+    });
+    const executionScratchDirectory = await executionScratch();
+    await expect(
+      verifyModulePackage({ archivePath, executionScratchDirectory, platform }),
+    ).rejects.toMatchObject({ code: "MODULE_PACKAGE_ENTRYPOINT_LOAD_FAILED" });
+    expect(await readdir(executionScratchDirectory)).toEqual([]);
+  });
+
+  it("reports a missing execution scratch as a verifier environment error", async () => {
+    const { archivePath } = await archiveFile();
+    const executionScratchDirectory = path.join(await scratch(), "missing");
+    await expect(
+      verifyModulePackage({ archivePath, executionScratchDirectory, platform }),
+    ).rejects.toMatchObject({
+      code: "MODULE_PACKAGE_VERIFIER_SCRATCH_UNAVAILABLE",
+      message:
+        "The verifier execution scratch directory is missing, not writable, or mounted noexec.",
+    });
+    await expect(stat(executionScratchDirectory)).rejects.toMatchObject({ code: "ENOENT" });
+  });
+
+  it("rejects an unsafe archive before consulting the execution scratch", async () => {
+    const { archivePath } = await archiveFile(
+      withEntry({ path: "example/../attacker-chosen", data: "x" }),
+    );
+    const executionScratchDirectory = path.join(await scratch(), "missing");
+    await expect(
+      verifyModulePackage({ archivePath, executionScratchDirectory, platform }),
+    ).rejects.toMatchObject({ code: "MODULE_PACKAGE_UNSAFE_PATH" });
+    await expect(stat(executionScratchDirectory)).rejects.toMatchObject({ code: "ENOENT" });
+  });
+
+  it("extracts only a verified package, with normalized modes, into a new directory", async () => {
+    const { archivePath } = await archiveFile();
+    const target = path.join(await scratch(), "example");
+    await verifyModulePackage({ archivePath, extractTo: target, platform });
+    const names = (await readdir(target, { recursive: true })).sort();
+    expect(names).toContain("ekklesia.package.json");
+    expect(names).toContain("LICENSE");
+    expect(names).toContain("dist/server/index.js");
+    expect((await stat(target)).mode & 0o7777).toBe(0o755);
+    expect((await stat(path.join(target, "dist", "server", "index.js"))).mode & 0o7777).toBe(0o644);
+
+    const { archivePath: broken } = await archiveFile({ runtimePackage: { name: "x" } });
+    const refused = path.join(await scratch(), "refused");
+    await expect(
+      verifyModulePackage({ archivePath: broken, extractTo: refused, platform }),
+    ).rejects.toBeInstanceOf(ModulePackageVerificationError);
+    await expect(stat(refused)).rejects.toMatchObject({ code: "ENOENT" });
+  });
+
+  it("refuses to extract over an existing directory", async () => {
+    const { archivePath } = await archiveFile();
+    const existing = await scratch();
+    await expect(
+      verifyModulePackage({ archivePath, extractTo: existing, platform }),
+    ).rejects.toMatchObject({ code: "MODULE_PACKAGE_EXTRACTION_FAILED" });
+  });
+
+  it("fails a wrong archive digest", async () => {
+    await rejection({}, "MODULE_PACKAGE_DIGEST_MISMATCH", { expectedSha256: sha256("other") });
+  });
+
+  it("fails a payload whose contents no longer match their digest", async () => {
+    await rejection(
+      {
+        tamper: (files) => {
+          files.set("dist/server/index.js", Buffer.from("export default {}; // attacker-chosen\n"));
+        },
+      },
+      "MODULE_PACKAGE_FILE_MISMATCH",
+    );
+  });
+
+  it("fails a listed file missing from the archive", async () => {
+    await rejection(
+      { tamper: (files) => void files.delete("THIRD_PARTY_NOTICES") },
+      "MODULE_PACKAGE_FILE_MISSING",
+    );
+  });
+
+  it("fails an archive file that is not listed", async () => {
+    await rejection(
+      withEntry({ path: "example/attacker-chosen.js", data: "extra" }),
+      "MODULE_PACKAGE_FILE_UNLISTED",
+    );
+  });
+
+  it.each([
+    ["a missing license declaration", undefined],
+    ["an empty license declaration", ""],
+    ["UNLICENSED", "UNLICENSED"],
+    ["a malformed SPDX expression", "MIT OR"],
+  ])("fails package metadata with %s", async (_label, license) => {
+    await rejection(
+      {
+        metadata: (metadata) => {
+          const changed: Record<string, unknown> = { ...metadata, license };
+          if (license === undefined) {
+            delete changed.license;
+          }
+          return changed;
+        },
+      },
+      "MODULE_PACKAGE_METADATA_INVALID",
+    );
+  });
+
+  it("fails closed on pre-ADR-0051 metadata", async () => {
+    await rejection(
+      {
+        metadata: (metadata) => {
+          const old: Record<string, unknown> = { ...metadata };
+          delete old.license;
+          return old;
+        },
+      },
+      "MODULE_PACKAGE_METADATA_INVALID",
+    );
+  });
+
+  it("requires LICENSE at the canonical path in both payload and inventory", async () => {
+    await rejection(
+      { tamper: (files) => void files.delete("LICENSE") },
+      "MODULE_PACKAGE_FILE_MISSING",
+    );
+    await rejection(
+      {
+        metadata: (metadata) => ({
+          ...metadata,
+          files: (metadata.files as { path: string }[]).filter((file) => file.path !== "LICENSE"),
+        }),
+      },
+      "MODULE_PACKAGE_METADATA_INVALID",
+    );
+    await rejection(
+      withEntry({ path: "example/licenses/LICENSE", data: "attacker-chosen" }),
+      "MODULE_PACKAGE_FILE_UNLISTED",
+    );
+    await rejection(
+      withEntry({ path: "example/COPYING", data: "attacker-chosen" }),
+      "MODULE_PACKAGE_FILE_UNLISTED",
+    );
+  });
+
+  it("checks the listed LICENSE bytes, size, and digest", async () => {
+    await rejection(
+      { tamper: (files) => files.set("LICENSE", Buffer.from("attacker-chosen")) },
+      "MODULE_PACKAGE_FILE_MISMATCH",
+    );
+    await rejection(
+      {
+        metadata: (metadata) => ({
+          ...metadata,
+          files: (metadata.files as { path: string; size: number; sha256: string }[]).map((file) =>
+            file.path === "LICENSE" ? { ...file, size: file.size + 1 } : file,
+          ),
+        }),
+      },
+      "MODULE_PACKAGE_FILE_MISMATCH",
+    );
+  });
+
+  it("rejects a duplicate LICENSE archive entry", async () => {
+    await rejection(
+      withEntry({ path: "example/LICENSE", data: "attacker-chosen" }),
+      "MODULE_PACKAGE_LAYOUT_INVALID",
+    );
+  });
+
+  it("fails when the manifest and the package disagree about the version", async () => {
+    await rejection(
+      { manifest: (manifest) => ({ ...manifest, version: "0.2.0" }) },
+      "MODULE_PACKAGE_IDENTITY_MISMATCH",
+    );
+  });
+
+  it("fails when the metadata names another module", async () => {
+    await rejection(
+      { metadata: (metadata) => ({ ...metadata, module: { id: "other", version: "0.1.0" } }) },
+      "MODULE_PACKAGE_IDENTITY_MISMATCH",
+    );
+  });
+
+  it("fails a runtime package.json that is not the generated shape", async () => {
+    await rejection(
+      {
+        runtimePackage: {
+          name: "@test/module-example",
+          version: "0.1.0",
+          private: true,
+          type: "module",
+          ekklesia: { layer: "module" },
+          dependencies: { "@ekklesia/module-sdk": "workspace:*" },
+        },
+      },
+      "MODULE_PACKAGE_RUNTIME_PACKAGE_INVALID",
+    );
+  });
+
+  it("fails an unsupported package format", async () => {
+    await rejection(
+      { metadata: (metadata) => ({ ...metadata, packageFormat: 2 }) },
+      "MODULE_PACKAGE_FORMAT_UNSUPPORTED",
+    );
+  });
+
+  it("fails transitional metadata it does not understand", async () => {
+    await rejection(
+      { metadata: (metadata) => ({ ...metadata, transitional: { orm: { prisma: "6.0.0" } } }) },
+      "MODULE_PACKAGE_TRANSITIONAL_UNSUPPORTED",
+    );
+    await rejection(
+      {
+        metadata: (metadata) => ({
+          ...metadata,
+          transitional: { databaseRuntime: { "drizzle-orm": "0.45.2", prisma: "6.0.0" } },
+        }),
+      },
+      "MODULE_PACKAGE_TRANSITIONAL_UNSUPPORTED",
+    );
+  });
+
+  it("enforces today's database runtime agreement, and accepts it when it holds", async () => {
+    await rejection(
+      {
+        metadata: (metadata) => ({
+          ...metadata,
+          transitional: { databaseRuntime: { "drizzle-orm": "0.44.0" } },
+        }),
+      },
+      "MODULE_PACKAGE_DATABASE_RUNTIME_INCOMPATIBLE",
+    );
+    const { archivePath } = await archiveFile({
+      metadata: (metadata) => ({
+        ...metadata,
+        transitional: { databaseRuntime: { "drizzle-orm": "0.45.2" } },
+      }),
+    });
+    await expect(verifyModulePackage({ archivePath, platform })).resolves.toMatchObject({
+      moduleId: "example",
+    });
+  });
+
+  it("verifies ABI-v1 plain schema metadata without comparing Drizzle with Core", async () => {
+    const { archivePath } = await archiveFile(abiPackage());
+
+    await expect(
+      verifyModulePackage({
+        archivePath,
+        platform: { ...platform, databaseRuntime: { "drizzle-orm": "99.0.0" } },
+      }),
+    ).resolves.toMatchObject({ moduleId: "example" });
+  });
+
+  it("rejects transitional database runtime metadata from an ABI-v1 package", async () => {
+    await rejection(
+      abiPackage({
+        metadata: (metadata) => ({
+          ...metadata,
+          transitional: { databaseRuntime: { "drizzle-orm": "0.45.2" } },
+        }),
+      }),
+      "MODULE_PACKAGE_DATABASE_RUNTIME_UNEXPECTED",
+    );
+  });
+
+  it("rejects an unsupported database ABI and malformed ABI-v1 schema metadata", async () => {
+    await rejection(
+      abiPackage({ manifest: (manifest) => ({ ...manifest, database: { abi: 2 } }) }),
+      "MODULE_PACKAGE_MANIFEST_INVALID",
+    );
+    const schemaError = await rejection(
+      abiPackage({
+        schemaSource:
+          'export default { moduleId: "example", tables: { records: "attacker-chosen" } };\n',
+      }),
+      "MODULE_PACKAGE_ENTRYPOINT_LOAD_FAILED",
+    );
+    expect(schemaError.message).not.toContain("attacker-chosen");
+  });
+
+  it("fails a target this platform cannot run", async () => {
+    await rejection(
+      {
+        metadata: (metadata) => ({
+          ...metadata,
+          target: "linux-arm64-musl",
+          runtime: { libcVersion: ">=1.2.0", node: ">=20", nodeApi: 9 },
+        }),
+      },
+      "MODULE_PACKAGE_TARGET_INCOMPATIBLE",
+    );
+  });
+
+  it("fails a native file inside an any-target package", async () => {
+    const native = await modulePackageFixture({
+      tamper: (files) => {
+        files.set("dist/addon.node", Buffer.from([0x7f, 0x45, 0x4c, 0x46]));
+      },
+      metadata: (metadata) => {
+        const files = [
+          ...(metadata.files as { path: string; size: number; sha256: string }[]),
+          {
+            path: "dist/addon.node",
+            size: 4,
+            sha256: sha256(Buffer.from([0x7f, 0x45, 0x4c, 0x46])),
+          },
+        ].sort((left, right) => (left.path < right.path ? -1 : 1));
+        return { ...metadata, files };
+      },
+    });
+    const archivePath = path.join(await scratch(), "native.tar.gz");
+    await writeFile(archivePath, native.archive);
+    await expect(verifyModulePackage({ archivePath, platform })).rejects.toMatchObject({
+      code: "MODULE_PACKAGE_NATIVE_FILE",
+    });
+  });
+
+  it("fails a package that needs a newer Node.js", async () => {
+    await rejection(
+      { metadata: (metadata) => ({ ...metadata, runtime: { node: ">=99" } }) },
+      "MODULE_PACKAGE_RUNTIME_INCOMPATIBLE",
+    );
+  });
+
+  it("fails an incorporated SDK outside the manifest's own range", async () => {
+    await rejection(
+      {
+        metadata: (metadata) => ({
+          ...metadata,
+          incorporates: { "@ekklesia/module-sdk": "0.9.0" },
+        }),
+      },
+      "MODULE_PACKAGE_SDK_INCOMPATIBLE",
+    );
+  });
+
+  it("fails a module whose declared entrypoint is missing", async () => {
+    await rejection(
+      {
+        manifest: (manifest) => ({
+          ...manifest,
+          version: "0.1.0",
+          entrypoints: {
+            ...(manifest.entrypoints as Record<string, unknown>),
+            schema: "./dist/schema/index.js",
+          },
+        }),
+      },
+      "MODULE_PACKAGE_MODULE_INVALID",
+    );
+  });
+
+  it("fails a backend that imports a dependency the package does not contain", async () => {
+    const error = await rejection(
+      {
+        serverSource:
+          'import pad from "ekklesia-dependency-not-in-this-package";\nexport default { id: "example", version: "0.1.0", register() { pad(); } };\n',
+      },
+      "MODULE_PACKAGE_ENTRYPOINT_LOAD_FAILED",
+    );
+    expect(error.message).not.toContain("ekklesia-dependency-not-in-this-package");
+  });
+
+  it("fails a backend whose default export names another module", async () => {
+    await rejection(
+      { serverSource: 'export default { id: "other", version: "0.1.0" };\n' },
+      "MODULE_PACKAGE_ENTRYPOINT_LOAD_FAILED",
+    );
+  });
+
+  it.each([
+    ["an absolute path", { path: "/etc/attacker-chosen", data: "x" }, "MODULE_PACKAGE_UNSAFE_PATH"],
+    [
+      "a .. segment",
+      { path: "example/../attacker-chosen", data: "x" },
+      "MODULE_PACKAGE_UNSAFE_PATH",
+    ],
+    [
+      "a symbolic link",
+      { path: "example/link", type: "symlink", linkname: "/etc/passwd" },
+      "MODULE_PACKAGE_LINK",
+    ],
+    [
+      "a hard link",
+      { path: "example/hard", type: "hardlink", linkname: "example/package.json" },
+      "MODULE_PACKAGE_LINK",
+    ],
+    [
+      "a device node",
+      { path: "example/device", type: "character" },
+      "MODULE_PACKAGE_SPECIAL_ENTRY",
+    ],
+    ["a FIFO", { path: "example/fifo", type: "fifo" }, "MODULE_PACKAGE_SPECIAL_ENTRY"],
+    [
+      "a setuid file",
+      { path: "example/setuid", data: "x", mode: 0o4755 },
+      "MODULE_PACKAGE_UNSAFE_MODE",
+    ],
+    [
+      "a setgid directory",
+      { path: "example/setgid", type: "directory", mode: 0o2755 },
+      "MODULE_PACKAGE_UNSAFE_MODE",
+    ],
+    [
+      "a second top-level directory",
+      { path: "attacker-chosen/file", data: "x" },
+      "MODULE_PACKAGE_LAYOUT_INVALID",
+    ],
+    [
+      "a duplicate entry",
+      { path: "example/package.json", data: "{}" },
+      "MODULE_PACKAGE_LAYOUT_INVALID",
+    ],
+  ] as const)("fails %s", async (_label, entry, code) => {
+    await rejection(withEntry(entry as FixtureEntry), code);
+  });
+
+  it("fails a file that is not a gzip-compressed tar archive", async () => {
+    const archivePath = path.join(await scratch(), "plain.tar.gz");
+    await writeFile(archivePath, "not an archive");
+    await expect(verifyModulePackage({ archivePath, platform })).rejects.toMatchObject({
+      code: "MODULE_PACKAGE_UNREADABLE",
+    });
+  });
+
+  describe("native targets (ADR 0049)", () => {
+    /** The first bytes of a 64-bit little-endian ELF object for `machine` (62 is x86-64). The
+     * verifier reads only the identification and machine fields. */
+    function elfHeader(machine = 62): Buffer {
+      const header = Buffer.alloc(64);
+      Buffer.from([0x7f, 0x45, 0x4c, 0x46, 2, 1, 1]).copy(header);
+      header.writeUInt16LE(3, 16);
+      header.writeUInt16LE(machine, 18);
+      return header;
+    }
+
+    const linuxHost = {
+      arch: "x64",
+      libc: { family: "glibc", version: "2.41" },
+      nodeApi: 10,
+      nodeAbi: "137",
+      platform: "linux",
+    } as const;
+
+    function nativePackage(
+      overrides: {
+        readonly files?: Record<string, Uint8Array | string>;
+        readonly target?: string;
+        readonly runtime?: Record<string, unknown>;
+      } = {},
+    ): PackageFixtureOptions {
+      return {
+        files: overrides.files ?? {
+          "node_modules/native-thing/index.js": "module.exports = {};\n",
+          "node_modules/native-thing/lib/native-thing.node": elfHeader(),
+          "node_modules/native-thing/package.json": '{"name":"native-thing","version":"1.0.0"}\n',
+        },
+        metadata: (metadata) => ({
+          ...metadata,
+          runtime: overrides.runtime ?? {
+            libcVersion: ">=2.28.0",
+            node: ">=20",
+            nodeApi: 9,
+          },
+          target: overrides.target ?? "linux-x64-glibc",
+        }),
+      };
+    }
+
+    async function verifyOn(
+      options: PackageFixtureOptions,
+      host: ModulePackageHost,
+    ): Promise<unknown> {
+      const { archivePath } = await archiveFile(options);
+      return verifyModulePackage({ archivePath, platform: { ...platform, host } });
+    }
+
+    async function refusedOn(
+      options: PackageFixtureOptions,
+      host: ModulePackageHost,
+      code: ModulePackageVerificationErrorCode,
+    ): Promise<void> {
+      await expect(verifyOn(options, host)).rejects.toMatchObject({ code });
+    }
+
+    it("accepts linux-x64-glibc on a matching host, native node_modules and addon included", async () => {
+      await expect(verifyOn(nativePackage(), linuxHost)).resolves.toMatchObject({
+        moduleId: "example",
+        target: "linux-x64-glibc",
+      });
+    });
+
+    it("refuses another operating system, CPU, or C library family", async () => {
+      await refusedOn(
+        nativePackage(),
+        { ...linuxHost, platform: "darwin" },
+        "MODULE_PACKAGE_TARGET_INCOMPATIBLE",
+      );
+      await refusedOn(
+        nativePackage(),
+        { ...linuxHost, arch: "arm64" },
+        "MODULE_PACKAGE_TARGET_INCOMPATIBLE",
+      );
+      // musl reports no glibc version, so the host cannot be proven glibc.
+      const { libc: _libc, ...musl } = linuxHost;
+      await refusedOn(nativePackage(), musl, "MODULE_PACKAGE_TARGET_INCOMPATIBLE");
+    });
+
+    it("refuses a target this platform does not implement", async () => {
+      await refusedOn(
+        nativePackage({ target: "linux-arm64-glibc" }),
+        { ...linuxHost, arch: "arm64" },
+        "MODULE_PACKAGE_TARGET_INCOMPATIBLE",
+      );
+    });
+
+    it("refuses a C library older than the package needs", async () => {
+      await refusedOn(
+        nativePackage(),
+        { ...linuxHost, libc: { family: "glibc", version: "2.17" } },
+        "MODULE_PACKAGE_LIBC_INCOMPATIBLE",
+      );
+      await expect(
+        verifyOn(nativePackage(), { ...linuxHost, libc: { family: "glibc", version: "2.28" } }),
+      ).resolves.toMatchObject({ target: "linux-x64-glibc" });
+    });
+
+    it("refuses a Node-API version or Node.js ABI the host does not provide", async () => {
+      await refusedOn(
+        nativePackage(),
+        { ...linuxHost, nodeApi: 8 },
+        "MODULE_PACKAGE_NODE_API_INCOMPATIBLE",
+      );
+      const { nodeApi: _nodeApi, ...unknownApi } = linuxHost;
+      await refusedOn(nativePackage(), unknownApi, "MODULE_PACKAGE_NODE_API_INCOMPATIBLE");
+      await refusedOn(
+        nativePackage({ runtime: { libcVersion: ">=2.28.0", node: ">=20", nodeAbi: "115" } }),
+        linuxHost,
+        "MODULE_PACKAGE_NODE_API_INCOMPATIBLE",
+      );
+    });
+
+    it("refuses a native file built for another machine, or an addon that is not one", async () => {
+      await refusedOn(
+        nativePackage({
+          files: { "node_modules/native-thing/lib/native-thing.node": elfHeader(183) },
+        }),
+        linuxHost,
+        "MODULE_PACKAGE_NATIVE_FILE_INCOMPATIBLE",
+      );
+      await refusedOn(
+        nativePackage({
+          files: { "node_modules/native-thing/lib/libthing.so": elfHeader(183) },
+        }),
+        linuxHost,
+        "MODULE_PACKAGE_NATIVE_FILE_INCOMPATIBLE",
+      );
+      await refusedOn(
+        nativePackage({
+          files: { "node_modules/native-thing/lib/native-thing.node": "not an ELF object" },
+        }),
+        linuxHost,
+        "MODULE_PACKAGE_NATIVE_FILE_INCOMPATIBLE",
+      );
+    });
+
+    it("requires a native package to state its Node.js interface and, on Linux, its C library", async () => {
+      await rejection(
+        nativePackage({ runtime: { libcVersion: ">=2.28.0", node: ">=20" } }),
+        "MODULE_PACKAGE_METADATA_INVALID",
+      );
+      await rejection(
+        nativePackage({ runtime: { node: ">=20", nodeApi: 9 } }),
+        "MODULE_PACKAGE_METADATA_INVALID",
+      );
+    });
+
+    it("keeps any-target packages free of node_modules, addons, and ELF objects", async () => {
+      await rejection(
+        { files: { "node_modules/thing/index.js": "module.exports = {};\n" } },
+        "MODULE_PACKAGE_NATIVE_FILE",
+      );
+      await rejection({ files: { "dist/thing.node": elfHeader() } }, "MODULE_PACKAGE_NATIVE_FILE");
+      await rejection({ files: { "dist/libthing.so": elfHeader() } }, "MODULE_PACKAGE_NATIVE_FILE");
+    });
+
+    it("establishes this host's facts from Node.js alone", () => {
+      const host = currentModulePackageHost();
+      expect(host.platform).toBe(process.platform);
+      expect(host.arch).toBe(process.arch);
+      expect(host.nodeApi).toBe(Number(process.versions.napi));
+      if (process.platform === "linux") {
+        const report = process.report.getReport() as { header?: { glibcVersionRuntime?: string } };
+        expect(host.libc?.version).toBe(report.header?.glibcVersionRuntime);
+      }
+    });
+  });
+
+  it("fails an archive without package metadata", async () => {
+    const fixture = await modulePackageFixture();
+    const { gunzipSync, gzipSync } = await import("node:zlib");
+    // Rebuild without the metadata entry by filtering the fixture through a fresh archive.
+    const archivePath = path.join(await scratch(), "no-metadata.tar.gz");
+    const raw = gunzipSync(fixture.archive);
+    const blocks: Buffer[] = [];
+    for (let offset = 0; offset + 512 <= raw.length; ) {
+      const headerBlock = raw.subarray(offset, offset + 512);
+      if (headerBlock.every((byte) => byte === 0)) {
+        break;
+      }
+      const name = headerBlock.subarray(0, 100).toString("latin1").replace(/\0.*$/su, "");
+      const size = Number.parseInt(headerBlock.subarray(124, 136).toString("latin1"), 8);
+      const length = 512 + Math.ceil(size / 512) * 512;
+      if (!name.endsWith("ekklesia.package.json")) {
+        blocks.push(raw.subarray(offset, offset + length));
+      }
+      offset += length;
+    }
+    await writeFile(archivePath, gzipSync(Buffer.concat([...blocks, Buffer.alloc(1024)])));
+    await expect(verifyModulePackage({ archivePath, platform })).rejects.toMatchObject({
+      code: "MODULE_PACKAGE_METADATA_MISSING",
+    });
+  });
+});

core/tests/module-permissions.test.ts

@@ -28,7 +28,7 @@ interface PermissionInput {
  * is read by `composePlatformPermissionRegistry`; the rest exist only to satisfy the type. */
 function fakeModule(id: string, permissions: readonly PermissionInput[] = []): DiscoveredModule {
   const manifest = parseModuleManifest({
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "0.1.0",

core/tests/module-realtime-runtime.test.ts

@@ -1,11 +1,8 @@
 import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import path from "node:path";
-import type {
+import type { ModuleRealtimePublisher } from "@ekklesia/contracts";
-  ModuleDatabase,
+import type { LegacyModuleRuntimeServices, ModuleDatabase } from "../src/modules/database.js";
-  ModuleRealtimePublisher,
-  ModuleRuntimeServices,
-} from "@ekklesia/contracts";
 import { afterEach, describe, expect, it } from "vitest";
 import { ModuleRuntimeError, startModuleRuntime } from "../src/modules/runtime.js";
 
@@ -22,7 +19,7 @@ afterEach(async () => {
   );
 });
 
-function fakeServices(): ModuleRuntimeServices {
+function fakeServices(): LegacyModuleRuntimeServices {
   return Object.freeze({ database: Object.freeze({}) as ModuleDatabase });
 }
 
@@ -31,7 +28,7 @@ function manifest(
   permissions: readonly Record<string, string>[] = [],
 ): Record<string, unknown> {
   return {
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "0.1.0",

core/tests/module-runtime.test.ts

@@ -1,21 +1,23 @@
 import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import path from "node:path";
+import type { ModuleConfiguration, ModuleDatabaseExecutor } from "@ekklesia/contracts";
 import type {
-  ModuleConfiguration,
+  AnyModuleRuntimeServices,
+  LegacyModuleRuntimeServices,
   ModuleDatabase,
-  ModuleRuntimeServices,
+} from "../src/modules/database.js";
-} from "@ekklesia/contracts";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { discoverModules } from "../src/modules/discovery.js";
-import { resolveModuleEligibility } from "../src/modules/lifecycle.js";
 import {
   ModuleDiscoveryError,
   ModuleRuntimeError,
   type ModuleRuntimeIssueCode,
+  type ModuleRuntimeServicesLookup,
   startDiscoveredModuleRuntime,
   startModuleRuntime,
 } from "../src/modules/index.js";
+import { resolveModuleEligibility } from "../src/modules/lifecycle.js";
 
 vi.mock("../src/modules/discovery.js", async (importOriginal) => {
   const actual = await importOriginal<typeof import("../src/modules/discovery.js")>();
@@ -52,12 +54,13 @@ function manifestFor(
   id: string,
   options: {
     capabilities?: Array<{ id: string; version: string }>;
+    database?: { abi: 1 };
     dependencies?: Record<string, unknown>;
     permissions?: Array<{ id: string; baseline: string; description: string }>;
   } = {},
 ): Record<string, unknown> {
   return {
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "0.1.0",
@@ -67,6 +70,7 @@ function manifestFor(
     },
     capabilities: options.capabilities ?? [],
     permissions: options.permissions ?? [],
+    ...(options.database ? { database: options.database } : {}),
     ...(options.dependencies ? { dependencies: options.dependencies } : {}),
     entrypoints: {
       server: "./dist/server/index.js",
@@ -145,13 +149,29 @@ function fakeModuleDatabase(): ModuleDatabase {
   }) as unknown as ModuleDatabase;
 }
 
-function fakeModuleRuntimeServices(): ModuleRuntimeServices {
+function fakeModuleRuntimeServices(): ModuleRuntimeServicesLookup {
-  return Object.freeze({ database: fakeModuleDatabase() });
+  const services = new Map<string, LegacyModuleRuntimeServices>();
+  const database = fakeModuleDatabase();
+  return new Proxy(services, {
+    get(target, property, receiver) {
+      if (property === "get") {
+        return (moduleId: string) => {
+          let value = target.get(moduleId);
+          if (!value) {
+            value = Object.freeze({ database });
+            target.set(moduleId, value);
+          }
+          return value;
+        };
+      }
+      return Reflect.get(target, property, receiver);
+    },
+  });
 }
 
 function runtimeOptions(
   modulesDirectory: string,
-  services: ModuleRuntimeServices = fakeModuleRuntimeServices(),
+  services: ModuleRuntimeServicesLookup = fakeModuleRuntimeServices(),
 ) {
   return {
     moduleSdkVersion: "0.1.0",
@@ -1067,6 +1087,54 @@ describe("already-discovered module runtime", () => {
 });
 
 describe("module runtime services", () => {
+  it("delivers only the manifest-selected database mode and distinct ABI executors", async () => {
+    const modulesDirectory = await createModulesDirectory();
+    const recorder = createReferenceRecorder();
+    const legacyDatabase = fakeModuleDatabase();
+    const alphaExecutor = Object.freeze({
+      abiVersion: 1,
+      query: vi.fn(),
+      transaction: vi.fn(),
+    }) as unknown as ModuleDatabaseExecutor;
+    const betaExecutor = Object.freeze({
+      abiVersion: 1,
+      query: vi.fn(),
+      transaction: vi.fn(),
+    }) as unknown as ModuleDatabaseExecutor;
+    const services: ModuleRuntimeServicesLookup = new Map<string, AnyModuleRuntimeServices>([
+      ["legacy", Object.freeze({ database: legacyDatabase })],
+      ["alpha", Object.freeze({ database: alphaExecutor })],
+      ["beta", Object.freeze({ database: betaExecutor })],
+    ]);
+    await createRuntimeModule(modulesDirectory, "legacy", {
+      serverSource: `export default { id: "legacy", version: "0.1.0", start({ services }) { ${recorder.expression}.push(services.database); } };`,
+    });
+    for (const id of ["alpha", "beta"]) {
+      await createRuntimeModule(modulesDirectory, id, {
+        manifest: manifestFor(id, { database: { abi: 1 } }),
+        serverSource: `export default { database: { abi: 1 }, id: ${JSON.stringify(id)}, version: "0.1.0", start({ services }) { ${recorder.expression}.push(services.database); } };`,
+      });
+    }
+
+    const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory, services));
+
+    expect(recorder.values).toEqual([alphaExecutor, betaExecutor, legacyDatabase]);
+    expect("select" in alphaExecutor).toBe(false);
+    expect(alphaExecutor).not.toBe(betaExecutor);
+    await runtime.stop();
+  });
+
+  it("rejects a runtime database declaration that disagrees with its manifest", async () => {
+    const modulesDirectory = await createModulesDirectory();
+    await createRuntimeModule(modulesDirectory, "mismatch", {
+      manifest: manifestFor("mismatch", { database: { abi: 1 } }),
+      serverSource: `export default { id: "mismatch", version: "0.1.0" };`,
+    });
+
+    const error = await captureRuntimeError(modulesDirectory);
+    expect(runtimeIssueCodes(error)).toContain("MODULE_RUNTIME_DATABASE_MISMATCH");
+  });
+
   it("never gives register a services field, and gives start and stop the exact same services object", async () => {
     const modulesDirectory = await createModulesDirectory();
     const services = fakeModuleRuntimeServices();
@@ -1086,11 +1154,11 @@ describe("module runtime services", () => {
 
     expect(registerServices.values).toEqual([undefined]);
     expect(lifecycleServices.values).toHaveLength(2);
-    expect(lifecycleServices.values[0]).toBe(services);
+    expect(lifecycleServices.values[0]).toBe(services.get("wired"));
-    expect(lifecycleServices.values[1]).toBe(services);
+    expect(lifecycleServices.values[1]).toBe(services.get("wired"));
   });
 
-  it("shares the exact same services object identity across every module's start hook", async () => {
+  it("selects a stable services object per module rather than sharing one across modules", async () => {
     const modulesDirectory = await createModulesDirectory();
     const services = fakeModuleRuntimeServices();
     const recorder = createReferenceRecorder();
@@ -1112,7 +1180,8 @@ describe("module runtime services", () => {
 
     const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory, services));
 
-    expect(recorder.values).toEqual([services, services]);
+    expect(recorder.values).toEqual([services.get("alpha"), services.get("beta")]);
+    expect(recorder.values[0]).not.toBe(recorder.values[1]);
     await runtime.stop();
   });
 
@@ -1141,23 +1210,26 @@ describe("module runtime services", () => {
       startModuleRuntime(runtimeOptions(modulesDirectory, services)),
     ).rejects.toBeInstanceOf(ModuleRuntimeError);
 
-    expect(recorder.values).toEqual([services, services]);
+    expect(recorder.values).toEqual([services.get("started"), services.get("started")]);
   });
 
   it("starts and stops a zero-module runtime without ever touching the provided services", async () => {
     const modulesDirectory = await createModulesDirectory();
-    const services = fakeModuleRuntimeServices();
+    const database = fakeModuleDatabase();
+    const services: ModuleRuntimeServicesLookup = new Map([
+      ["unused", Object.freeze({ database })],
+    ]);
 
     const runtime = await startModuleRuntime(runtimeOptions(modulesDirectory, services));
     await runtime.stop();
 
     expect(runtime.modules).toEqual([]);
-    expect(vi.mocked(services.database.select)).not.toHaveBeenCalled();
+    expect(vi.mocked(database.select)).not.toHaveBeenCalled();
-    expect(vi.mocked(services.database.insert)).not.toHaveBeenCalled();
+    expect(vi.mocked(database.insert)).not.toHaveBeenCalled();
-    expect(vi.mocked(services.database.update)).not.toHaveBeenCalled();
+    expect(vi.mocked(database.update)).not.toHaveBeenCalled();
-    expect(vi.mocked(services.database.delete)).not.toHaveBeenCalled();
+    expect(vi.mocked(database.delete)).not.toHaveBeenCalled();
-    expect(vi.mocked(services.database.execute)).not.toHaveBeenCalled();
+    expect(vi.mocked(database.execute)).not.toHaveBeenCalled();
-    expect(vi.mocked(services.database.transaction)).not.toHaveBeenCalled();
+    expect(vi.mocked(database.transaction)).not.toHaveBeenCalled();
   });
 });
 
@@ -1463,7 +1535,7 @@ describe("module configuration delivery (ADR 0029)", () => {
     expect(recorder.values).toEqual([["object", []]]);
   });
 
-  it("keeps the services object one shared identity even though configuration is per-module", async () => {
+  it("keeps each module's services object stable while configuration remains per-module", async () => {
     const modulesDirectory = await createModulesDirectory();
     const services = fakeModuleRuntimeServices();
     const recorder = createReferenceRecorder();
@@ -1492,11 +1564,11 @@ describe("module configuration delivery (ADR 0029)", () => {
     await runtime.stop();
 
     const [alphaServices, alphaConfig, bravoServices, bravoConfig] = recorder.values;
-    // This is the reason configuration is a sibling of `services` rather than a field inside it:
+    // Configuration remains a sibling of `services`: both are selected per module, but they are
-    // `services` is deliberately one shared object for the whole runtime, while configuration must
+    // independently composed snapshots with separate contracts and lifetimes.
-    // differ per module. Both properties hold simultaneously.
+    expect(alphaServices).toBe(services.get("alpha"));
-    expect(alphaServices).toBe(services);
+    expect(bravoServices).toBe(services.get("bravo"));
-    expect(bravoServices).toBe(services);
+    expect(alphaServices).not.toBe(bravoServices);
     expect(alphaConfig).not.toBe(bravoConfig);
     expect((alphaConfig as ModuleConfiguration).getString("label")).toBe("alpha");
     expect((bravoConfig as ModuleConfiguration).getString("label")).toBe("bravo");

core/tests/module-schema-discovery.test.ts

@@ -38,10 +38,14 @@ async function createModulesDirectory(): Promise<string> {
 
 function manifestFor(
   id: string,
-  options: { dependencies?: Record<string, unknown>; schema?: string | false } = {},
+  options: {
+    database?: { abi: 1 };
+    dependencies?: Record<string, unknown>;
+    schema?: string | false;
+  } = {},
 ): Record<string, unknown> {
   return {
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "0.1.0",
@@ -49,6 +53,7 @@ function manifestFor(
     ...(options.dependencies ? { dependencies: options.dependencies } : {}),
     capabilities: [],
     permissions: [],
+    ...(options.database ? { database: options.database } : {}),
     entrypoints: {
       server: "./dist/server/index.js",
       ...(options.schema === false ? {} : { schema: options.schema ?? "./dist/schema/index.js" }),
@@ -126,6 +131,62 @@ function issueCodes(error: ModuleSchemaDiscoveryError): ModuleSchemaDiscoveryIss
 }
 
 describe("module schema discovery", () => {
+  it("loads ABI-v1 schema entrypoints as plain metadata without importing an ORM", async () => {
+    const modulesDirectory = await createModulesDirectory();
+    await createSchemaModule(modulesDirectory, "calendar", {
+      manifest: manifestFor("calendar", { database: { abi: 1 } }),
+      schemaSource: `
+        export default {
+          moduleId: "calendar",
+          tables: [
+            { name: "calendar_events", foreignKeys: [] },
+            { name: "calendar_attendees", foreignKeys: [{ table: "calendar_events" }] }
+          ]
+        };
+      `,
+    });
+
+    const aggregate = await discoverModuleSchemas(discoveryOptions(modulesDirectory));
+
+    expect(aggregate.tables.map((table) => table.name)).toEqual([
+      "calendar_attendees",
+      "calendar_events",
+    ]);
+    expect(aggregate.tables.every((table) => table.table === undefined)).toBe(true);
+    expect(aggregate.drizzleSchema).toEqual({});
+  });
+
+  it("aggregates ABI-v1 prefix, duplicate, cross-module FK, missing target, and malformed errors", async () => {
+    const modulesDirectory = await createModulesDirectory();
+    await createSchemaModule(modulesDirectory, "alpha", {
+      manifest: manifestFor("alpha", { database: { abi: 1 } }),
+      schemaSource: `export default {
+        moduleId: "alpha",
+        tables: [
+          { name: "wrong_records", foreignKeys: [] },
+          { name: "alpha_records", foreignKeys: [{ table: "beta_records" }] },
+          { name: "alpha_records", foreignKeys: [{ table: "alpha_missing" }] }
+        ]
+      };`,
+    });
+    await createSchemaModule(modulesDirectory, "malformed", {
+      manifest: manifestFor("malformed", { database: { abi: 1 } }),
+      schemaSource: `export default { moduleId: "malformed", tables: [{ name: "malformed_rows", unknown: true }] };`,
+    });
+
+    const error = await captureSchemaError(modulesDirectory);
+
+    expect(issueCodes(error)).toEqual(
+      expect.arrayContaining([
+        "MODULE_SCHEMA_CROSS_MODULE_FOREIGN_KEY",
+        "MODULE_SCHEMA_EXPORT_INVALID",
+        "MODULE_SCHEMA_FOREIGN_KEY_TARGET_MISSING",
+        "MODULE_SCHEMA_TABLE_DUPLICATE",
+        "MODULE_SCHEMA_TABLE_NAMESPACE_INVALID",
+      ]),
+    );
+  });
+
   it("returns a frozen empty aggregate without importing module servers", async () => {
     const modulesDirectory = await createModulesDirectory();
     const recorder = createGlobalEventRecorder();

core/tests/module-storage-lifecycle.test.ts

@@ -18,7 +18,7 @@ function fakeModule(
   } = {},
 ): DiscoveredModule {
   const manifest = parseModuleManifest({
-    manifestVersion: 7,
+    manifestVersion: 8,
     id,
     name: `${id} module`,
     version: "1.0.0",

core/tests/module-storage.test.ts

@@ -1,5 +1,6 @@
 import {
   EMPTY_MODULE_STORAGE,
+  isModuleStorageError,
   isValidModuleStorageKey,
   MODULE_STORAGE_KEY_MAX_BYTES,
   MODULE_STORAGE_READ_URL_DEFAULT_SECONDS,
@@ -322,6 +323,17 @@ describe("module storage scoping", () => {
     }
   });
 
+  it("recognizes a storage error from an installed module's separate package copy", () => {
+    const external = Object.assign(new Error("The storage service could not be reached."), {
+      code: "STORAGE_PROVIDER_UNAVAILABLE",
+      name: "ModuleStorageError",
+    });
+
+    expect(external).not.toBeInstanceOf(ModuleStorageError);
+    expect(isModuleStorageError(external)).toBe(true);
+    expect(isModuleStorageError(Object.assign(new Error("no"), { code: "UNKNOWN" }))).toBe(false);
+  });
+
   it("gives a module no way to reach another module's storage by knowing its name", async () => {
     const shared = fakeProvider();
     const announcements = createModuleStorage({

core/tests/module-ui-publication.test.ts

@@ -79,7 +79,7 @@ async function createModule(modulesDirectory: string, fixture: ModuleFixture): P
         version: contribution.version,
       })),
       id: fixture.id,
-      manifestVersion: 7,
+      manifestVersion: 8,
       name: `${fixture.id} module`,
       permissions:
         fixture.display === undefined

core/tests/modules-directory-commands.test.ts

@@ -0,0 +1,119 @@
+import { createHash } from "node:crypto";
+import { mkdtemp, readdir, readFile, rm } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { afterEach, describe, expect, it } from "vitest";
+import { discoverRepositoryMigrations } from "../src/cli/migration-command-support.js";
+import { resolveCommandModulesDirectory } from "../src/cli/modules-directory-environment.js";
+import { discoverCoreMigrations } from "../src/migrations/index.js";
+import { ModuleDiscoveryError } from "../src/modules/index.js";
+import { createMigrationModule } from "./support/migration-module-fixture.js";
+
+const repositoryRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..", "..");
+const temporaryDirectories: string[] = [];
+
+afterEach(async () => {
+  await Promise.all(
+    temporaryDirectories.splice(0).map((directory) => rm(directory, { recursive: true })),
+  );
+});
+
+async function externalModulesDirectory(): Promise<string> {
+  const directory = await mkdtemp(path.join(tmpdir(), "ekklesia-installed-modules-"));
+  temporaryDirectories.push(directory);
+  return directory;
+}
+
+describe("operator commands select the modules directory through host configuration", () => {
+  it("defaults to the repository's own modules directory", () => {
+    expect(resolveCommandModulesDirectory({}, "/opt/ekklesia")).toEqual({
+      modulesDirectory: "/opt/ekklesia/modules",
+      modulesDirectoryRequired: false,
+    });
+  });
+
+  it("honours EKKLESIA_MODULES_DIR", () => {
+    expect(
+      resolveCommandModulesDirectory(
+        { EKKLESIA_MODULES_DIR: "/var/lib/ekklesia/modules" },
+        "/opt/ekklesia",
+      ),
+    ).toEqual({ modulesDirectory: "/var/lib/ekklesia/modules", modulesDirectoryRequired: true });
+  });
+
+  it("refuses a relative EKKLESIA_MODULES_DIR without echoing it", () => {
+    expect(() =>
+      resolveCommandModulesDirectory({ EKKLESIA_MODULES_DIR: "modules-9e1f" }, "/opt/ekklesia"),
+    ).toThrow(ModuleDiscoveryError);
+    try {
+      resolveCommandModulesDirectory({ EKKLESIA_MODULES_DIR: "modules-9e1f" }, "/opt/ekklesia");
+    } catch (error) {
+      expect(JSON.stringify((error as ModuleDiscoveryError).issues)).not.toContain("9e1f");
+    }
+  });
+
+  it("plans migrations for modules installed outside the repository, with Core's from the platform", async () => {
+    // A minimal installed module generated from nothing in the repository, so this test never
+    // depends on build output or ignored files: a clean checkout runs it before anything is built.
+    const modulesDirectory = await externalModulesDirectory();
+    const installed = await createMigrationModule(modulesDirectory, "example");
+    expect(path.relative(repositoryRoot, modulesDirectory).startsWith("..")).toBe(true);
+
+    const aggregate = await discoverRepositoryMigrations(repositoryRoot, {
+      EKKLESIA_MODULES_DIR: modulesDirectory,
+    });
+
+    expect(aggregate.modules.map((module) => module.moduleId)).toEqual(["core", "example"]);
+
+    // Core's migrations are exactly the platform's own, byte for byte, from `core/drizzle`.
+    const platformCore = await discoverCoreMigrations({
+      coreMigrationsDirectory: path.join(repositoryRoot, "core", "drizzle"),
+    });
+    const fingerprint = (migrations: readonly { identity: string; checksum: string }[]) =>
+      migrations.map((migration) => `${migration.identity} ${migration.checksum}`);
+    expect(platformCore.length).toBeGreaterThan(0);
+    expect(fingerprint(aggregate.modules[0]?.migrations ?? [])).toEqual(fingerprint(platformCore));
+
+    // The module's migration is the one installed outside the repository, byte for byte.
+    const installedSql = await readFile(
+      path.join(installed.migrationDirectory ?? "", "0000_initial.sql"),
+    );
+    expect(fingerprint(aggregate.modules[1]?.migrations ?? [])).toEqual([
+      `example:0000_initial ${createHash("sha256").update(installedSql).digest("hex")}`,
+    ]);
+  });
+
+  it("fails closed when the configured directory does not exist", async () => {
+    const parent = await externalModulesDirectory();
+    await expect(
+      discoverRepositoryMigrations(repositoryRoot, {
+        EKKLESIA_MODULES_DIR: path.join(parent, "absent"),
+      }),
+    ).rejects.toBeInstanceOf(ModuleDiscoveryError);
+  });
+});
+
+describe("no source chooses a modules directory except the resolver", () => {
+  async function sourceFiles(directory: string): Promise<readonly string[]> {
+    const entries = await readdir(directory, { recursive: true, withFileTypes: true });
+    return entries
+      .filter((entry) => entry.isFile() && entry.name.endsWith(".ts"))
+      .map((entry) => path.join(entry.parentPath, entry.name));
+  }
+
+  it("never joins `modules` onto a root anywhere else in Core or the API", async () => {
+    const files = [
+      ...(await sourceFiles(path.join(repositoryRoot, "core", "src"))),
+      ...(await sourceFiles(path.join(repositoryRoot, "apps", "api", "src"))),
+    ];
+    const resolver = path.join(repositoryRoot, "core", "src", "modules", "modules-directory.ts");
+    for (const file of files) {
+      if (file === resolver) {
+        continue;
+      }
+      const text = await readFile(file, "utf8");
+      expect(text, path.relative(repositoryRoot, file)).not.toMatch(/,\s*"modules"\s*\)/u);
+    }
+  });
+});

core/tests/modules-directory.test.ts

@@ -0,0 +1,159 @@
+import { mkdtemp, rm, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import {
+  discoverModules,
+  ModuleDiscoveryError,
+  type ModuleDiscoveryIssueCode,
+  resolveModulesDirectory,
+} from "../src/modules/index.js";
+
+const versions = { moduleSdkVersion: "0.1.0", platformVersion: "0.1.0" } as const;
+const repositoryRoot = path.join(path.sep, "opt", "ekklesia");
+const temporaryDirectories: string[] = [];
+
+afterEach(async () => {
+  await Promise.all(
+    temporaryDirectories.splice(0).map((directory) => rm(directory, { recursive: true })),
+  );
+});
+
+async function temporaryDirectory(): Promise<string> {
+  const directory = await mkdtemp(path.join(tmpdir(), "ekklesia-modules-directory-"));
+  temporaryDirectories.push(directory);
+  return directory;
+}
+
+function captureDiscoveryError(operation: () => unknown): ModuleDiscoveryError {
+  try {
+    operation();
+  } catch (error) {
+    expect(error).toBeInstanceOf(ModuleDiscoveryError);
+    return error as ModuleDiscoveryError;
+  }
+  throw new Error("Expected a ModuleDiscoveryError.");
+}
+
+async function captureAsyncDiscoveryError(
+  operation: Promise<unknown>,
+): Promise<ModuleDiscoveryError> {
+  try {
+    await operation;
+  } catch (error) {
+    expect(error).toBeInstanceOf(ModuleDiscoveryError);
+    return error as ModuleDiscoveryError;
+  }
+  throw new Error("Expected a ModuleDiscoveryError.");
+}
+
+function codes(error: ModuleDiscoveryError): readonly ModuleDiscoveryIssueCode[] {
+  return error.issues.map((issue) => issue.code);
+}
+
+/** Everything an operator, a log, or a test report could ever see from this error. */
+function rendered(error: ModuleDiscoveryError): string {
+  return JSON.stringify({ issues: error.issues, message: error.message, stack: error.stack });
+}
+
+describe("resolveModulesDirectory", () => {
+  it("defaults to the repository's own modules directory when nothing is configured", () => {
+    expect(resolveModulesDirectory({ configured: undefined, repositoryRoot })).toEqual({
+      modulesDirectory: path.join(repositoryRoot, "modules"),
+      modulesDirectoryRequired: false,
+    });
+  });
+
+  it("accepts an explicit absolute path, normalized, and requires it to exist", () => {
+    expect(
+      resolveModulesDirectory({ configured: "/var/lib/ekklesia/modules/", repositoryRoot }),
+    ).toEqual({ modulesDirectory: "/var/lib/ekklesia/modules", modulesDirectoryRequired: true });
+    expect(
+      resolveModulesDirectory({ configured: "/var/lib/./ekklesia//modules", repositoryRoot }),
+    ).toEqual({ modulesDirectory: "/var/lib/ekklesia/modules", modulesDirectoryRequired: true });
+  });
+
+  it("never resolves a configured path against the repository or the working directory", () => {
+    const resolved = resolveModulesDirectory({ configured: "/srv/modules", repositoryRoot });
+    expect(resolved.modulesDirectory).toBe("/srv/modules");
+  });
+
+  it.each([
+    ["a relative name", "modules"],
+    ["a dot-relative path", "./modules"],
+    ["a parent-relative path", "../private/modules"],
+    ["a home-relative path", "~/modules"],
+    ["the empty string", ""],
+    ["whitespace only", "   "],
+    ["an absolute path with surrounding whitespace", " /var/lib/ekklesia/modules"],
+    ["a NUL byte", "/var/lib/ekklesia/\u0000modules"],
+  ])("rejects %s with a sanitized MODULES_DIRECTORY_INVALID", (_label, configured) => {
+    const error = captureDiscoveryError(() =>
+      resolveModulesDirectory({ configured, repositoryRoot }),
+    );
+    expect(codes(error)).toEqual(["MODULES_DIRECTORY_INVALID"]);
+    expect(error.issues[0]?.message).toBe("EKKLESIA_MODULES_DIR must be an absolute path.");
+  });
+
+  it("never echoes the supplied value in the error", () => {
+    const configured = "relative/secret-token-a1b2c3/postgresql://admin:hunter2@db/modules";
+    const error = captureDiscoveryError(() =>
+      resolveModulesDirectory({ configured, repositoryRoot }),
+    );
+    const text = rendered(error);
+    expect(text).not.toContain("secret-token-a1b2c3");
+    expect(text).not.toContain("hunter2");
+    expect(text).not.toContain("relative/");
+  });
+});
+
+describe("module discovery against a configured modules directory", () => {
+  it("fails closed, without the path, when a configured directory does not exist", async () => {
+    const parent = await temporaryDirectory();
+    const missing = path.join(parent, "private-mount-name-7f3e");
+    const error = await captureAsyncDiscoveryError(
+      discoverModules({ ...versions, modulesDirectory: missing, modulesDirectoryRequired: true }),
+    );
+    expect(codes(error)).toEqual(["MODULES_DIRECTORY_UNREADABLE"]);
+    expect(rendered(error)).not.toContain("private-mount-name-7f3e");
+    expect(rendered(error)).not.toContain(parent);
+  });
+
+  it("fails closed when a configured path is a file rather than a directory", async () => {
+    const parent = await temporaryDirectory();
+    const file = path.join(parent, "modules");
+    await writeFile(file, "not a directory");
+    const error = await captureAsyncDiscoveryError(
+      discoverModules({ ...versions, modulesDirectory: file, modulesDirectoryRequired: true }),
+    );
+    expect(codes(error)).toEqual(["MODULES_DIRECTORY_UNREADABLE"]);
+    expect(rendered(error)).not.toContain(parent);
+  });
+
+  it("rejects a relative configured path even when it bypasses the resolver", async () => {
+    const error = await captureAsyncDiscoveryError(
+      discoverModules({ ...versions, modulesDirectory: "modules", modulesDirectoryRequired: true }),
+    );
+    expect(codes(error)).toEqual(["MODULES_DIRECTORY_INVALID"]);
+  });
+
+  it("treats an existing, empty configured directory as zero installed modules", async () => {
+    const directory = await temporaryDirectory();
+    await expect(
+      discoverModules({ ...versions, modulesDirectory: directory, modulesDirectoryRequired: true }),
+    ).resolves.toEqual([]);
+  });
+
+  it("keeps the development default lenient: a missing default directory is zero modules", async () => {
+    const parent = await temporaryDirectory();
+    await expect(
+      discoverModules({ ...versions, modulesDirectory: path.join(parent, "modules") }),
+    ).resolves.toEqual([]);
+  });
+
+  it("discovers through the resolver's own selection unchanged", async () => {
+    const directory = await temporaryDirectory();
+    const selection = resolveModulesDirectory({ configured: directory, repositoryRoot });
+    await expect(discoverModules({ ...versions, ...selection })).resolves.toEqual([]);
+  });
+});

core/tests/postgres-migration.integration.ts

@@ -1,5 +1,7 @@
 import { createHash, randomBytes } from "node:crypto";
+import { cp, mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import net from "node:net";
+import { tmpdir } from "node:os";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 import { Client, type QueryResult, type QueryResultRow } from "pg";
@@ -8,6 +10,7 @@ import { reportMigrationCommandError } from "../src/cli/migration-command-errors
 import {
   applyModuleMigrations,
   createPostgresMigrationDatabase,
+  discoverAllMigrations,
   discoverCoreMigrations,
   type MigrationApproval,
   type MigrationApprovalProvider,
@@ -764,7 +767,7 @@ describe.sequential("live PostgreSQL module migration execution", () => {
         database: migrationDatabase,
       });
 
-      expect(result).toEqual({ applied: [], appliedCount: 0, noOp: true });
+      expect(result).toEqual({ applied: [], appliedCount: 0, noOp: true, retained: [] });
       expect(await databaseState(database.client)).toEqual(before);
       const afterData = await safeQuery<QueryResultRow>(
         database.client,
@@ -834,7 +837,48 @@ describe.sequential("live PostgreSQL module migration execution", () => {
     });
   });
 
-  it("rejects an unknown applied identity without repair or further execution", async () => {
+  it("retains an absent module's history and still applies later work (ADR 0048)", async () => {
+    await withIsolatedDatabase("absent_history", async (database) => {
+      const initial = peopleInitial();
+      const later = peopleLater();
+      const initialInventory = aggregate(moduleFixture("people", [initial]));
+      const completeInventory = aggregate(moduleFixture("people", [initial, later]));
+      const migrationDatabase = createPostgresMigrationDatabase(database.url);
+      await applyModuleMigrations({ aggregate: initialInventory, database: migrationDatabase });
+      // History left by a module that is no longer installed: kept, reported, never fatal.
+      await safeQuery(
+        database.client,
+        `
+          INSERT INTO public.ekklesia_core_migrations
+            (identity, module_id, migration_tag, migration_index, checksum)
+          VALUES ($1, $2, $3, $4, $5)
+        `,
+        ["ghost:0000_unknown", "ghost", "0000_unknown", 0, "f".repeat(64)],
+      );
+
+      const plan = await planModuleMigrations({
+        aggregate: completeInventory,
+        database: migrationDatabase,
+      });
+      expect(plan.retained).toEqual([{ appliedCount: 1, moduleId: "ghost" }]);
+      expect(plan.pendingCount).toBe(1);
+
+      const result = await applyModuleMigrations({
+        aggregate: completeInventory,
+        database: migrationDatabase,
+      });
+      expect(result.applied.map((migration) => migration.identity)).toEqual([later.identity]);
+      expect(result.retained).toEqual([{ appliedCount: 1, moduleId: "ghost" }]);
+      expect(await columnExists(database.client, "people_records", "email")).toBe(true);
+      expect((await readHistory(database.client)).map((row) => row.identity)).toEqual([
+        initial.identity,
+        "ghost:0000_unknown",
+        later.identity,
+      ]);
+    });
+  });
+
+  it("rejects an unknown applied identity of an installed module without repair or further execution", async () => {
     await withIsolatedDatabase("unknown_history", async (database) => {
       const initial = peopleInitial();
       const later = peopleLater();
@@ -849,7 +893,7 @@ describe.sequential("live PostgreSQL module migration execution", () => {
             (identity, module_id, migration_tag, migration_index, checksum)
           VALUES ($1, $2, $3, $4, $5)
         `,
-        ["ghost:0000_unknown", "ghost", "0000_unknown", 0, "f".repeat(64)],
+        ["people:0099_unknown", "people", "0099_unknown", 99, "f".repeat(64)],
       );
       const corrupted = await databaseState(database.client);
 
@@ -866,7 +910,7 @@ describe.sequential("live PostgreSQL module migration execution", () => {
       expect(await columnExists(database.client, "people_records", "email")).toBe(false);
       expect((await readHistory(database.client)).map((row) => row.identity)).toEqual([
         initial.identity,
-        "ghost:0000_unknown",
+        "people:0099_unknown",
       ]);
     });
   });
@@ -1358,7 +1402,7 @@ describe.sequential("live PostgreSQL Core identity migration execution", () => {
         database: migrationDatabase,
       });
 
-      expect(result).toEqual({ applied: [], appliedCount: 0, noOp: true });
+      expect(result).toEqual({ applied: [], appliedCount: 0, noOp: true, retained: [] });
       expect(await databaseState(database.client)).toEqual(before);
     });
   });
@@ -1851,3 +1895,151 @@ describe.sequential("live PostgreSQL migration timeout precedence", () => {
     });
   });
 });
+
+/**
+ * ADR 0048 end to end, with real discovery: Core's committed migrations, the module template
+ * installed in a modules directory outside the repository, and a real PostgreSQL. Core's newest
+ * migration is withheld from a copy of `core/drizzle` at first, so a genuinely later Core migration
+ * can be applied while the module is absent.
+ */
+describe.sequential("live PostgreSQL retained history for an uninstalled module", () => {
+  const repositoryRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..", "..");
+  const templateModule = path.join(repositoryRoot, "templates", "module");
+  const versions = { moduleSdkVersion: "0.2.0", platformVersion: "0.2.0" } as const;
+
+  async function coreWithoutNewestMigration(directory: string): Promise<string> {
+    const target = path.join(directory, "core-drizzle");
+    await cp(coreMigrationsDirectory, target, { recursive: true });
+    const journalPath = path.join(target, "meta", "_journal.json");
+    const policyPath = path.join(target, "meta", "_ekklesia.json");
+    const journal = JSON.parse(await readFile(journalPath, "utf8")) as {
+      entries: { idx: number; tag: string }[];
+    };
+    const policy = JSON.parse(await readFile(policyPath, "utf8")) as { entries: unknown[] };
+    const newest = journal.entries.pop();
+    policy.entries.pop();
+    if (!newest) {
+      throw harnessError("Core has no migration to withhold.");
+    }
+    await writeFile(journalPath, `${JSON.stringify(journal, null, 2)}\n`);
+    await writeFile(policyPath, `${JSON.stringify(policy, null, 2)}\n`);
+    await rm(path.join(target, `${newest.tag}.sql`));
+    await rm(path.join(target, "meta", `${String(newest.idx).padStart(4, "0")}_snapshot.json`));
+    return target;
+  }
+
+  async function installExample(modulesDirectory: string): Promise<void> {
+    for (const entry of ["package.json", "ekklesia.module.json", "drizzle", "dist"]) {
+      await cp(path.join(templateModule, entry), path.join(modulesDirectory, "example", entry), {
+        recursive: true,
+      });
+    }
+  }
+
+  async function inventory(coreDirectory: string, modulesDirectory: string) {
+    return discoverAllMigrations({
+      coreMigrationsDirectory: coreDirectory,
+      moduleDiscovery: { ...versions, modulesDirectory, modulesDirectoryRequired: true },
+    });
+  }
+
+  async function exampleValues(client: Client): Promise<readonly string[]> {
+    const result = await safeQuery<{ readonly value: string } & QueryResultRow>(
+      client,
+      "SELECT value FROM public.example_records ORDER BY value",
+    );
+    return result.rows.map((row) => row.value);
+  }
+
+  it("keeps an uninstalled module's data and history, applies later Core work, and restores it", async () => {
+    const scratch = await mkdtemp(path.join(tmpdir(), "ekklesia-retained-history-"));
+    try {
+      const earlyCore = await coreWithoutNewestMigration(scratch);
+      const modulesDirectory = path.join(scratch, "modules");
+      await mkdir(modulesDirectory);
+      await installExample(modulesDirectory);
+
+      await withIsolatedDatabase("retained_module", async (database) => {
+        const migrationDatabase = createPostgresMigrationDatabase(database.url);
+
+        // 1. Core (minus its newest migration) and the installed module, applied together.
+        const first = await applyModuleMigrations({
+          aggregate: await inventory(earlyCore, modulesDirectory),
+          database: migrationDatabase,
+        });
+        expect(first.applied.map((migration) => migration.identity)).toContain(
+          "example:0000_initial",
+        );
+        expect(first.retained).toEqual([]);
+
+        // 2. Module-owned data.
+        await safeQuery(
+          database.client,
+          "INSERT INTO public.example_records (id, value) VALUES (gen_random_uuid(), 'kept')",
+        );
+
+        // 3. The module is uninstalled: its directory is gone from module storage.
+        await rm(path.join(modulesDirectory, "example"), { recursive: true });
+
+        // 4. A later Core migration plans and applies while the module is absent.
+        const absentInventory = await inventory(coreMigrationsDirectory, modulesDirectory);
+        const absentPlan = await planModuleMigrations({
+          aggregate: absentInventory,
+          database: migrationDatabase,
+        });
+        expect(absentPlan.retained).toEqual([{ appliedCount: 1, moduleId: "example" }]);
+        expect(
+          absentPlan.entries.filter((entry) => entry.status === "pending").map((e) => e.moduleId),
+        ).toEqual(["core"]);
+        const later = await applyModuleMigrations({
+          aggregate: absentInventory,
+          database: migrationDatabase,
+        });
+        expect(later.applied).toHaveLength(1);
+        expect(later.applied[0]?.moduleId).toBe("core");
+        expect(later.retained).toEqual([{ appliedCount: 1, moduleId: "example" }]);
+
+        // 5. The module's table and rows are untouched, and so is its history.
+        expect(await exampleValues(database.client)).toEqual(["kept"]);
+        expect((await readHistory(database.client)).map((row) => row.identity)).toContain(
+          "example:0000_initial",
+        );
+
+        // 6. The module is reinstalled.
+        await installExample(modulesDirectory);
+        const restored = await inventory(coreMigrationsDirectory, modulesDirectory);
+
+        // 7. Its history is strict again, and valid; its data is where it left it.
+        const restoredPlan = await planModuleMigrations({
+          aggregate: restored,
+          database: migrationDatabase,
+        });
+        expect(restoredPlan.retained).toEqual([]);
+        expect(restoredPlan.pendingCount).toBe(0);
+        expect(
+          restoredPlan.entries.find((entry) => entry.identity === "example:0000_initial")?.status,
+        ).toBe("applied");
+        const noOp = await applyModuleMigrations({
+          aggregate: restored,
+          database: migrationDatabase,
+        });
+        expect(noOp.noOp).toBe(true);
+        expect(await exampleValues(database.client)).toEqual(["kept"]);
+
+        // A returning package whose applied migration changed is refused, exactly as before.
+        const sqlPath = path.join(modulesDirectory, "example", "drizzle", "0000_initial.sql");
+        await writeFile(sqlPath, `${await readFile(sqlPath, "utf8")}-- edited\n`);
+        await captureRunnerError(
+          planModuleMigrations({
+            aggregate: await inventory(coreMigrationsDirectory, modulesDirectory),
+            database: migrationDatabase,
+          }),
+          "MIGRATION_CHECKSUM_MISMATCH",
+        );
+        expect(await exampleValues(database.client)).toEqual(["kept"]);
+      });
+    } finally {
+      await rm(scratch, { recursive: true, force: true });
+    }
+  });
+});

core/tests/support/import-safety.ts

@@ -0,0 +1,19 @@
+/**
+ * The per-test timeout for Core's import-safety tests, and only those.
+ *
+ * Each of these tests proves that importing a module does nothing (no I/O, no connection, no output)
+ * by performing a cold dynamic `import()` of a large Core source graph inside the test body. Vitest
+ * transforms and evaluates that whole graph on demand, and that work is CPU-bound. An ordinary test
+ * file's own top-level imports run before its tests start and fall under no per-test timeout; these
+ * deliberately do not, so the cost lands inside Vitest's default 5-second test timeout.
+ *
+ * Alone they take about 0.7–1.2 s. During a full `pnpm verify`, Turbo runs every package's suite at
+ * once and the CPU is saturated. Reproduced locally (six cores, Core's suite alongside five other
+ * packages' suites), the same tests took 3.0–5.4 s, and so timed out intermittently.
+ *
+ * 30 seconds is about five times the slowest time measured under load, which leaves room for slower
+ * shared CI runners. It matches the repository's integration-test timeout. It is still bounded, so a
+ * module that genuinely hangs while being imported, for example on a network call, still fails. The
+ * assertions themselves are unchanged: these tests fail on what an import does, never on speed.
+ */
+export const IMPORT_SAFETY_TEST_TIMEOUT_MS = 30_000;

core/tests/support/migration-module-fixture.ts

@@ -0,0 +1,171 @@
+import { mkdir, writeFile } from "node:fs/promises";
+import path from "node:path";
+
+/**
+ * A minimal, valid installed module written into a directory the caller owns: `package.json`,
+ * `ekklesia.module.json`, a compiled-ESM server stub at `dist/server/index.js`, and, unless
+ * disabled, a native Drizzle migration directory (journal, `_ekklesia.json` policy, snapshot chain,
+ * and SQL) that passes Core's migration discovery.
+ *
+ * Everything is generated here, from nothing in the repository: no build output, no ignored file,
+ * and no `node_modules`. Migration discovery imports no module code, so the stub is never run.
+ */
+
+export const originSnapshotId = "00000000-0000-0000-0000-000000000000";
+
+export interface MigrationFixture {
+  readonly breakpoints?: boolean;
+  readonly destructive?:
+    | { readonly mode: "none" }
+    | { readonly mode: "approval-required"; readonly reason: string };
+  readonly snapshotId?: string;
+  readonly sql: string | Uint8Array;
+  readonly tag: string;
+  readonly timestamp?: number;
+}
+
+export interface MigrationModuleFixture {
+  readonly dependencies?: Record<string, unknown>;
+  readonly manifest?: Record<string, unknown>;
+  readonly migrations?: readonly MigrationFixture[] | false;
+  readonly schemaSource?: string;
+  readonly serverSource?: string;
+}
+
+export interface CreatedMigrationModule {
+  readonly migrationDirectory?: string;
+  readonly moduleDirectory: string;
+}
+
+export function snapshotId(index: number): string {
+  return `10000000-0000-4000-8000-${(index + 1).toString(16).padStart(12, "0")}`;
+}
+
+export function manifestFor(
+  id: string,
+  options: {
+    readonly dependencies?: Record<string, unknown>;
+    readonly migrations?: boolean;
+    readonly schema?: boolean;
+  } = {},
+): Record<string, unknown> {
+  return {
+    manifestVersion: 8,
+    id,
+    name: `${id} module`,
+    version: "0.1.0",
+    compatibility: { platform: "^0.2.0", moduleSdk: "^0.2.0" },
+    ...(options.dependencies ? { dependencies: options.dependencies } : {}),
+    capabilities: [],
+    permissions: [],
+    entrypoints: {
+      server: "./dist/server/index.js",
+      ...(options.schema ? { schema: "./dist/schema/index.js" } : {}),
+      ...(options.migrations === false ? {} : { migrations: "./drizzle" }),
+    },
+  };
+}
+
+export function defaultMigrations(id: string): readonly MigrationFixture[] {
+  return [
+    {
+      sql: `CREATE TABLE "${id.replaceAll("-", "_")}_records" ("id" integer);\n`,
+      tag: "0000_initial",
+    },
+  ];
+}
+
+export async function createMigrationModule(
+  modulesDirectory: string,
+  id: string,
+  fixture: MigrationModuleFixture = {},
+): Promise<CreatedMigrationModule> {
+  const migrations =
+    fixture.migrations === false ? undefined : (fixture.migrations ?? defaultMigrations(id));
+  const moduleDirectory = path.join(modulesDirectory, id);
+  const migrationDirectory = migrations ? path.join(moduleDirectory, "drizzle") : undefined;
+  await mkdir(path.join(moduleDirectory, "dist/server"), { recursive: true });
+  if (fixture.schemaSource !== undefined) {
+    await mkdir(path.join(moduleDirectory, "dist/schema"), { recursive: true });
+  }
+  if (migrationDirectory) {
+    await mkdir(path.join(migrationDirectory, "meta"), { recursive: true });
+  }
+
+  await Promise.all([
+    writeFile(
+      path.join(moduleDirectory, "package.json"),
+      JSON.stringify({
+        name: `@test/module-${id}`,
+        version: "0.1.0",
+        type: "module",
+        ekklesia: { layer: "module" },
+      }),
+    ),
+    writeFile(
+      path.join(moduleDirectory, "ekklesia.module.json"),
+      JSON.stringify(
+        fixture.manifest ??
+          manifestFor(id, {
+            ...(fixture.dependencies ? { dependencies: fixture.dependencies } : {}),
+            migrations: migrations !== undefined,
+            schema: fixture.schemaSource !== undefined,
+          }),
+      ),
+    ),
+    writeFile(
+      path.join(moduleDirectory, "dist/server/index.js"),
+      fixture.serverSource ?? `export default { id: ${JSON.stringify(id)}, version: "0.1.0" };`,
+    ),
+    ...(fixture.schemaSource === undefined
+      ? []
+      : [writeFile(path.join(moduleDirectory, "dist/schema/index.js"), fixture.schemaSource)]),
+  ]);
+
+  if (!migrationDirectory || !migrations) {
+    return { moduleDirectory };
+  }
+
+  const journalEntries = migrations.map((migration, index) => ({
+    idx: index,
+    version: "7",
+    when: migration.timestamp ?? 1_700_000_000_000 + index,
+    tag: migration.tag,
+    breakpoints: migration.breakpoints ?? true,
+  }));
+  const policyEntries = migrations.map((migration) => ({
+    tag: migration.tag,
+    destructive: migration.destructive ?? { mode: "none" },
+  }));
+  await Promise.all([
+    writeFile(
+      path.join(migrationDirectory, "meta/_journal.json"),
+      JSON.stringify({ version: "7", dialect: "postgresql", entries: journalEntries }),
+    ),
+    writeFile(
+      path.join(migrationDirectory, "meta/_ekklesia.json"),
+      JSON.stringify({ version: 1, moduleId: id, entries: policyEntries }),
+    ),
+    ...migrations.flatMap((migration, index) => {
+      const idForSnapshot = migration.snapshotId ?? snapshotId(index);
+      const previousId =
+        index === 0
+          ? originSnapshotId
+          : (migrations[index - 1]?.snapshotId ?? snapshotId(index - 1));
+      return [
+        writeFile(path.join(migrationDirectory, `${migration.tag}.sql`), migration.sql),
+        writeFile(
+          path.join(migrationDirectory, `meta/${index.toString().padStart(4, "0")}_snapshot.json`),
+          JSON.stringify({
+            version: "7",
+            dialect: "postgresql",
+            id: idForSnapshot,
+            prevId: previousId,
+          }),
+        ),
+      ];
+    }),
+  ]);
+
+  return { migrationDirectory, moduleDirectory };
+}

core/tests/support/module-package-fixture.ts

@@ -0,0 +1,214 @@
+import { createHash } from "node:crypto";
+import { mkdtemp, readdir, readFile, rm } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { gzipSync } from "node:zlib";
+import { createMigrationModule } from "./migration-module-fixture.js";
+
+/**
+ * Test-only builders for Ekklesia Module Package v1 archives (ADR 0049). They write ustar archives
+ * by hand so a test can produce exactly what the canonical packager never would: links, device
+ * nodes, traversal, a second top-level directory, a corrupted payload.
+ */
+
+export type FixtureEntryType = "file" | "directory" | "symlink" | "hardlink" | "character" | "fifo";
+
+export interface FixtureEntry {
+  readonly path: string;
+  readonly type?: FixtureEntryType;
+  readonly mode?: number;
+  readonly data?: Uint8Array | string;
+  readonly linkname?: string;
+}
+
+const typeflags: Readonly<Record<FixtureEntryType, string>> = {
+  character: "3",
+  directory: "5",
+  fifo: "6",
+  file: "0",
+  hardlink: "1",
+  symlink: "2",
+};
+
+function octal(value: number, width: number): string {
+  return `${value.toString(8).padStart(width - 1, "0")}\u0000`;
+}
+
+function header(entry: FixtureEntry, size: number): Buffer {
+  const block = Buffer.alloc(512);
+  const name =
+    entry.type === "directory" && !entry.path.endsWith("/") ? `${entry.path}/` : entry.path;
+  let prefix = "";
+  let base = name;
+  if (Buffer.byteLength(name) > 100) {
+    const split = name.lastIndexOf("/", name.length - 2);
+    prefix = name.slice(0, split);
+    base = name.slice(split + 1);
+  }
+  block.write(base, 0, 100, "latin1");
+  block.write(octal(entry.mode ?? (entry.type === "directory" ? 0o755 : 0o644), 8), 100, "latin1");
+  block.write(octal(0, 8), 108, "latin1");
+  block.write(octal(0, 8), 116, "latin1");
+  block.write(octal(size, 12), 124, "latin1");
+  block.write(octal(0, 12), 136, "latin1");
+  block.write("        ", 148, "latin1");
+  block.write(typeflags[entry.type ?? "file"], 156, "latin1");
+  block.write(entry.linkname ?? "", 157, 100, "latin1");
+  block.write("ustar\u000000", 257, "latin1");
+  block.write(prefix, 345, 155, "latin1");
+  let checksum = 0;
+  for (const byte of block) {
+    checksum += byte;
+  }
+  block.write(`${checksum.toString(8).padStart(6, "0")}\u0000 `, 148, "latin1");
+  return block;
+}
+
+/** A gzip-compressed ustar archive of exactly these entries, in this order. */
+export function tarGz(entries: readonly FixtureEntry[]): Buffer {
+  const parts: Buffer[] = [];
+  for (const entry of entries) {
+    const data =
+      entry.type === undefined || entry.type === "file"
+        ? Buffer.from(entry.data ?? "")
+        : Buffer.alloc(0);
+    parts.push(header(entry, data.length), data, Buffer.alloc((512 - (data.length % 512)) % 512));
+  }
+  parts.push(Buffer.alloc(1024));
+  return gzipSync(Buffer.concat(parts), { level: 9 });
+}
+
+export function sha256(data: Uint8Array | string): string {
+  return createHash("sha256").update(data).digest("hex");
+}
+
+export interface PackageFixtureOptions {
+  readonly id?: string;
+  readonly version?: string;
+  readonly serverSource?: string;
+  readonly schemaSource?: string;
+  readonly manifest?: (manifest: Record<string, unknown>) => Record<string, unknown>;
+  readonly runtimePackage?: Record<string, unknown>;
+  readonly metadata?: (metadata: Record<string, unknown>) => Record<string, unknown>;
+  /** Changes the payload after its digests were computed. */
+  readonly tamper?: (files: Map<string, Buffer>) => void;
+  /** Entries appended after the package's own, under any path. */
+  readonly extraEntries?: readonly FixtureEntry[];
+  /** Extra payload files, listed in the metadata like every other file. */
+  readonly files?: Readonly<Record<string, Uint8Array | string>>;
+}
+
+export interface PackageFixture {
+  readonly archive: Buffer;
+  readonly sha256: string;
+}
+
+async function readTree(root: string): Promise<Map<string, Buffer>> {
+  const files = new Map<string, Buffer>();
+  for (const entry of await readdir(root, { recursive: true, withFileTypes: true })) {
+    if (entry.isFile()) {
+      const absolute = path.join(entry.parentPath, entry.name);
+      files.set(path.relative(root, absolute).split(path.sep).join("/"), await readFile(absolute));
+    }
+  }
+  return files;
+}
+
+/**
+ * A valid any-target package of a minimal module: a server stub with no imports, one migration, a
+ * notices file, the generated runtime package.json, and complete metadata. Every option changes one
+ * thing, so a test can break exactly the rule it is about.
+ */
+export async function modulePackageFixture(
+  options: PackageFixtureOptions = {},
+): Promise<PackageFixture> {
+  const id = options.id ?? "example";
+  const version = options.version ?? "0.1.0";
+  const scratch = await mkdtemp(path.join(tmpdir(), "ekklesia-package-fixture-"));
+  let files: Map<string, Buffer>;
+  try {
+    const created = await createMigrationModule(scratch, id, {
+      ...(options.schemaSource === undefined ? {} : { schemaSource: options.schemaSource }),
+      serverSource:
+        options.serverSource ??
+        `export default { id: ${JSON.stringify(id)}, version: ${JSON.stringify(version)}, register() {} };\n`,
+    });
+    files = await readTree(created.moduleDirectory);
+  } finally {
+    await rm(scratch, { force: true, recursive: true });
+  }
+
+  const manifest = JSON.parse(
+    files.get("ekklesia.module.json")?.toString("utf8") ?? "{}",
+  ) as Record<string, unknown>;
+  files.set(
+    "ekklesia.module.json",
+    Buffer.from(
+      `${JSON.stringify(options.manifest ? options.manifest(manifest) : { ...manifest, version }, null, 2)}\n`,
+    ),
+  );
+  files.set(
+    "package.json",
+    Buffer.from(
+      `${JSON.stringify(
+        options.runtimePackage ?? {
+          name: `@test/module-${id}`,
+          version,
+          private: true,
+          type: "module",
+          ekklesia: { layer: "module" },
+        },
+        null,
+        2,
+      )}\n`,
+    ),
+  );
+  files.set("THIRD_PARTY_NOTICES", Buffer.from("No third-party software is included.\n"));
+  files.set("LICENSE", Buffer.from("Example module license text.\n"));
+  for (const [filePath, data] of Object.entries(options.files ?? {})) {
+    files.set(filePath, Buffer.from(data));
+  }
+
+  const listed = [...files.entries()]
+    .sort(([left], [right]) => (left < right ? -1 : left > right ? 1 : 0))
+    .map(([filePath, data]) => ({ path: filePath, size: data.length, sha256: sha256(data) }));
+  const baseMetadata: Record<string, unknown> = {
+    packageFormat: 1,
+    module: { id, version },
+    license: "MIT",
+    target: "any",
+    runtime: { node: ">=20" },
+    provenance: {
+      revision: "86ae907f59458508e3277666cdd214f5bd7c1078",
+      packager: { name: "@ekklesia/module-pack", version: "0.2.0" },
+    },
+    incorporates: { "@ekklesia/module-sdk": "0.2.0" },
+    files: listed,
+  };
+  const metadata = options.metadata ? options.metadata(baseMetadata) : baseMetadata;
+  options.tamper?.(files);
+
+  const directories = new Set<string>([id]);
+  for (const filePath of files.keys()) {
+    const segments = filePath.split("/");
+    for (let index = 1; index < segments.length; index += 1) {
+      directories.add(`${id}/${segments.slice(0, index).join("/")}`);
+    }
+  }
+  const all = new Map<string, FixtureEntry>();
+  for (const directory of directories) {
+    all.set(directory, { path: directory, type: "directory" });
+  }
+  for (const [filePath, data] of files) {
+    all.set(`${id}/${filePath}`, { path: `${id}/${filePath}`, data });
+  }
+  all.set(`${id}/ekklesia.package.json`, {
+    path: `${id}/ekklesia.package.json`,
+    data: `${JSON.stringify(metadata, null, 2)}\n`,
+  });
+  const ordered = [...all.values()].sort((left, right) =>
+    left.path < right.path ? -1 : left.path > right.path ? 1 : 0,
+  );
+  const archive = tarGz([...ordered, ...(options.extraEntries ?? [])]);
+  return { archive, sha256: sha256(archive) };
+}

core/tests/verify-module-package-cli.test.ts

@@ -0,0 +1,92 @@
+import { readFile } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { describe, expect, it } from "vitest";
+import {
+  MODULE_VERIFIER_SCRATCH_ENV,
+  moduleVerifierScratchDirectory,
+  parseSha256File,
+  parseVerifyModulePackageArguments,
+  readModulePackagePlatform,
+} from "../src/cli/verify-module-package.js";
+
+const repositoryRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..", "..");
+const digest = "ab".repeat(32);
+
+describe("verify-module-package arguments", () => {
+  it("takes an archive and, optionally, a digest and an extraction directory", () => {
+    expect(parseVerifyModulePackageArguments(["example-0.1.0-any.tar.gz"])).toEqual({
+      archivePath: "example-0.1.0-any.tar.gz",
+    });
+    expect(
+      parseVerifyModulePackageArguments([
+        "x.tar.gz",
+        "--sha256",
+        digest.toUpperCase(),
+        "--extract-to",
+        "/staging/example",
+      ]),
+    ).toEqual({ archivePath: "x.tar.gz", expectedSha256: digest, extractTo: "/staging/example" });
+    expect(
+      parseVerifyModulePackageArguments(["x.tar.gz", "--sha256-file", "x.tar.gz.sha256"]),
+    ).toEqual({ archivePath: "x.tar.gz", sha256File: "x.tar.gz.sha256" });
+  });
+
+  it.each([
+    ["no archive", []],
+    ["two archives", ["a.tar.gz", "b.tar.gz"]],
+    ["an unknown option", ["a.tar.gz", "--force"]],
+    ["both digest options", ["a.tar.gz", "--sha256", digest, "--sha256-file", "a.sha256"]],
+    ["a malformed digest", ["a.tar.gz", "--sha256", "abc"]],
+    ["an option without its value", ["a.tar.gz", "--extract-to"]],
+  ])("refuses %s", (_label, argv) => {
+    expect(() => parseVerifyModulePackageArguments(argv)).toThrow();
+  });
+});
+
+describe("verify-module-package digest files", () => {
+  it("reads the sha256sum format, ignoring the recorded file name", () => {
+    expect(parseSha256File(`${digest}  example-0.1.0-any.tar.gz\n`)).toBe(digest);
+    expect(parseSha256File(`${digest.toUpperCase()} *renamed.tar.gz\n`)).toBe(digest);
+  });
+
+  it.each([
+    "",
+    "not-a-digest  x.tar.gz\n",
+    `${digest}\n${digest}  second\n`,
+  ])("refuses %j", (contents) => {
+    expect(() => parseSha256File(contents)).toThrow();
+  });
+});
+
+describe("verify-module-package execution scratch", () => {
+  it("accepts an absolute operator-configured directory and otherwise leaves the library default", () => {
+    expect(moduleVerifierScratchDirectory({})).toBeUndefined();
+    expect(
+      moduleVerifierScratchDirectory({ [MODULE_VERIFIER_SCRATCH_ENV]: "/run/ekklesia-verifier" }),
+    ).toBe("/run/ekklesia-verifier");
+  });
+
+  it.each(["", "relative/path"])("refuses the invalid configured path %j", (configured) => {
+    expect(() =>
+      moduleVerifierScratchDirectory({ [MODULE_VERIFIER_SCRATCH_ENV]: configured }),
+    ).toThrow(`${MODULE_VERIFIER_SCRATCH_ENV} must be an absolute path.`);
+  });
+});
+
+describe("verify-module-package platform facts", () => {
+  it("reads this platform's versions and its transitional database runtime from the repository", async () => {
+    const root = JSON.parse(await readFile(path.join(repositoryRoot, "package.json"), "utf8"));
+    const core = JSON.parse(
+      await readFile(path.join(repositoryRoot, "core", "package.json"), "utf8"),
+    );
+    const sdk = JSON.parse(
+      await readFile(path.join(repositoryRoot, "packages", "module-sdk", "package.json"), "utf8"),
+    );
+    await expect(readModulePackagePlatform(repositoryRoot)).resolves.toEqual({
+      databaseRuntime: { "drizzle-orm": core.dependencies["drizzle-orm"] },
+      moduleSdkVersion: sdk.version,
+      platformVersion: root.version,
+    });
+  });
+});

core/tsconfig.json

@@ -2,7 +2,8 @@
   "extends": "../packages/typescript-config/node.json",
   "compilerOptions": {
     "noEmit": true,
-    "types": ["node", "vitest/globals"]
+    "types": ["node", "vitest/globals"],
+    "rewriteRelativeImportExtensions": true
   },
   "include": [
     "drizzle.config.ts",

deploy/Dockerfile

@@ -1,9 +1,10 @@
-# Ekklesia's one production image (ADR 0044): the `api` service and every operator-run CLI, from one
+# Ekklesia's one generic platform image (ADR 0044, ADR 0048): the `api` service and every operator-run
-# build. See deploy/README.md for how to build and run it.
+# CLI, from one build, for every installation. See deploy/README.md for how to build and run it.
 #
-# The build context is an already-assembled workspace: the platform, zero or more module packages in
+# The build context is this repository. The image contains **zero feature modules**: installed
-# `modules/<id>`, and the `pnpm-lock.yaml` that describes exactly that set. This file clones nothing
+# modules live in installation-owned storage, mounted read-only at /var/lib/ekklesia/modules
-# and chooses no modules. With an empty or absent `modules/`, it builds the platform alone.
+# (EKKLESIA_MODULES_DIR) and discovered when a process starts. `.dockerignore` keeps a checkout's
+# `modules/` out of the context, so a build is the same whether or not one is present.
 #
 # No `# syntax=` directive, deliberately: it would make BuildKit pull an unpinned frontend image.
 # The built-in frontend supports everything below, including cache mounts.
@@ -28,9 +29,10 @@ COPY package.json ./
 RUN corepack enable && corepack install
 
 # ---------------------------------------------------------------------------------------------------
-# manifests: the lockfile, workspace configuration, and every workspace package.json, at their
+# manifests: the lockfile, workspace configuration, and the package.json of every platform package
-# repository paths. Dependency installation keys on these alone, so a source-only change reuses the
+# the runtime needs, at their repository paths. Dependency installation keys on these alone, so a
-# installed layers.
+# source-only change reuses the installed layers. The module template is a workspace package but not
+# part of the platform, so neither its manifest nor its dependencies reach the runtime.
 # ---------------------------------------------------------------------------------------------------
 FROM base AS manifests
 WORKDIR /context
@@ -38,9 +40,8 @@ COPY . .
 RUN set -eu; \
     mkdir /manifests; \
     cp package.json pnpm-lock.yaml pnpm-workspace.yaml .npmrc /manifests/; \
-    for manifest in apps/*/package.json builders/*/package.json core/package.json \
+    for manifest in apps/*/package.json core/package.json packages/*/package.json \
-                    modules/*/package.json packages/*/package.json surfaces/*/package.json \
+                    surfaces/*/package.json; do \
-                    templates/*/package.json; do \
       if [ -f "$manifest" ]; then install -D -m 0644 "$manifest" "/manifests/$manifest"; fi; \
     done
 
@@ -52,37 +53,38 @@ FROM toolchain AS build
 # module UI builder's, which every module build invokes), and pnpm links a bin only when its target
 # already exists. The store cache mount keeps a rebuild off the network all the same.
 COPY . .
+# A second line of defence behind `.dockerignore`: a context that still carries installed modules is
+# refused rather than built into a platform image.
+RUN if [ -e modules ]; then \
+      echo "The build context contains modules/. Installed modules never enter the platform image (ADR 0048)." >&2; \
+      exit 1; \
+    fi
 RUN --mount=type=cache,id=ekklesia-pnpm-store,target=/pnpm/store \
     pnpm install --frozen-lockfile --store-dir /pnpm/store
-# The same gates `pnpm verify` runs for boundaries, modules, and migrations, against exactly the
+# The same gates `pnpm verify` runs for boundaries, modules, and migrations. With no modules in the
-# module set in this context. `pnpm boundaries` comes first and reads only sources: among its rules,
+# context, module validation covers the empty set and migration validation covers Core's own. Each
-# a module that imports something at run time without declaring it a production dependency fails
-# here, because the production-only install below would leave it unresolvable at API startup. Each
 # validate script builds first; the final build is a Turbo cache hit that keeps the intent explicit.
 RUN pnpm boundaries && pnpm modules:validate && pnpm migrations:validate && pnpm build
 # What the runtime resolves at startup, at the paths it resolves them from:
-#   - every workspace package's `dist/` (every package exports only from `dist/`), which includes
+#   - every platform package's `dist/` (every package exports only from `dist/`), which includes
 #     the Dashboard and display host assets under `surfaces/shell/dist/browser/`;
-#   - Core's migrations, `core/drizzle/` with its `meta/` journal;
+#   - Core's migrations, `core/drizzle/` with its `meta/` journal.
-#   - each module directory whole, minus `node_modules`, because each manifest names its own
+# Never a module and never the module template. `node_modules` comes from the production-only
-#     entrypoints, UI artifacts, and migrations directory.
+# install below, never from this stage.
-# `node_modules` comes from the production-only install below, never from this stage.
 RUN set -eu; \
-    mkdir -p /runtime/core /runtime/modules; \
+    mkdir -p /runtime/core; \
     for package in apps/* core packages/* surfaces/*; do \
       if [ -d "$package/dist" ]; then \
         mkdir -p "/runtime/$package"; \
         cp -a "$package/dist" "/runtime/$package/dist"; \
       fi; \
     done; \
-    cp -a core/drizzle /runtime/core/drizzle; \
+    cp -a core/drizzle /runtime/core/drizzle
-    if [ -d modules ]; then \
-      tar -C modules --exclude='node_modules' -cf - . | tar -C /runtime/modules -xf -; \
-    fi
 
 # ---------------------------------------------------------------------------------------------------
-# prod-deps: the same lockfile, production dependencies only. No compiler, bundler, or test runner
+# prod-deps: the same lockfile, production dependencies only, for the platform packages alone. No
-# reaches the runtime image.
+# compiler, bundler, or test runner reaches the runtime image, and neither does anything only the
+# module template depends on.
 # ---------------------------------------------------------------------------------------------------
 FROM toolchain AS prod-deps
 COPY --from=manifests /manifests/ ./
@@ -109,13 +111,19 @@ LABEL org.opencontainers.image.title="Ekklesia" \
 # the API still binds 127.0.0.1. `production` is stated rather than relied on as the default.
 ENV NODE_ENV=production \
     EKKLESIA_API_HOST=0.0.0.0 \
-    EKKLESIA_API_PORT=3000
+    EKKLESIA_API_PORT=3000 \
+    EKKLESIA_MODULES_DIR=/var/lib/ekklesia/modules
 
 # The repository layout, preserved: the API finds the repository root three directories above
-# `apps/api/dist/`, and every CLI uses its working directory as the root.
+# `apps/api/dist/`, and every CLI uses its working directory as the root. Installed modules are not
+# under it: they are read from EKKLESIA_MODULES_DIR.
 WORKDIR /opt/ekklesia
 COPY --from=prod-deps /opt/ekklesia/ ./
 COPY --from=build /runtime/ ./
+# The mount point for installation-owned module storage (ADR 0048), empty in the image. An image run
+# with nothing mounted there has zero modules; the reference deployment mounts host storage
+# read-only over it.
+RUN install -d -o root -g root -m 0755 /var/lib/ekklesia/modules
 
 # Files stay root-owned: the unprivileged runtime user can read the installation, never modify it.
 USER node

deploy/README.md

@@ -64,6 +64,7 @@ TLS is everywhere, without any exception in Core:
 | `/etc/ekklesia/object-storage.env` | The S3 key pair | `object-storage` |
 | `/etc/ekklesia/tunnel.env` | `TUNNEL_TOKEN` | `tunnel` |
 | `/etc/ekklesia/tls/` | The CA and server certificates and keys | mounted file by file |
+| `/var/lib/ekklesia/modules/` | Installed modules ([Installed modules](#installed-modules)); not a secret | `api`, `migrate`, read-only |
 
 The secret files are owned by root with mode 600, one per service, so no container receives another
 service's credentials. None is committed, and `deploy/.env` is ignored by Git. `EKKLESIA_ENV_DIR`
@@ -94,10 +95,19 @@ and `EKKLESIA_TLS_DIR` in `deploy/.env` move the directories.
 
    `EKKLESIA_IDENTITY_BASE_URL` and `EKKLESIA_IDENTITY_TRUSTED_ORIGINS` are `https://` and your
    Ekklesia hostname. `S3_DELIVERY_ENDPOINT` is `https://` and your storage hostname.
-5. **Configure the proxy:** copy `Caddyfile.example` to `Caddyfile`, and set `EKKLESIA_HOSTNAME`,
+5. **Create module storage**, empty, even if you install no module yet:
+
+   ```sh
+   sudo install -d -o root -g root -m 755 /var/lib/ekklesia/modules
+   ```
+
+   `api` and `migrate` refuse to start without it: Compose never creates it for you, so a mistyped
+   path cannot quietly become an empty directory. `EKKLESIA_MODULES_HOST_DIR` in `deploy/.env`
+   moves it.
+6. **Configure the proxy:** copy `Caddyfile.example` to `Caddyfile`, and set `EKKLESIA_HOSTNAME`,
    `EKKLESIA_STORAGE_HOSTNAME`, and `EKKLESIA_ACME_EMAIL` in `deploy/.env`. Both hostnames must
    resolve to this host with ports 80 and 443 reachable for HTTP-01, or see [DNS-01](#dns-01).
-6. **Start the data services, then migrate explicitly:**
+7. **Start the data services, then migrate explicitly:**
 
    ```sh
    docker compose -f compose.yaml -f compose.proxy.yaml up -d --wait postgres object-storage
@@ -107,8 +117,8 @@ and `EKKLESIA_TLS_DIR` in `deploy/.env` move the directories.
 
    Nothing ever applies migrations automatically: the API never does, and `migrate` runs only when
    you run it.
-7. **Start everything:** `docker compose -f compose.yaml -f compose.proxy.yaml up -d --wait`.
+8. **Start everything:** `docker compose -f compose.yaml -f compose.proxy.yaml up -d --wait`.
-8. **Check it:** `curl https://<hostname>/api/v1/health/ready` answers `{"status":"ready"}`, and
+9. **Check it:** `curl https://<hostname>/api/v1/health/ready` answers `{"status":"ready"}`, and
    `docker compose run --rm migrate node core/dist/cli/doctor.js` reports `READY` (with warnings
    for anything optional you left unconfigured, such as email).
 
@@ -123,25 +133,125 @@ is created already verified, so they can sign in before any email relay exists
 ([ADR 0035](../docs/architecture/decisions/0035-initial-platform-owner-bootstrap.md)). To supply the
 password from a secret manager instead, pipe it on standard input and use `-T` instead of `-it`.
 
+### Installed modules
+
+The image contains no modules
+([ADR 0048](../docs/architecture/decisions/0048-generic-image-and-installed-module-storage.md)).
+Installed modules live on the host, in module storage: `/var/lib/ekklesia/modules`, or
+`EKKLESIA_MODULES_HOST_DIR`. Compose mounts it **read-only** at `/var/lib/ekklesia/modules` in `api`
+and `migrate`, which is where `EKKLESIA_MODULES_DIR` points. Ekklesia never writes there.
+Installing, updating, or removing a module never needs a new image, only a restart.
+
+**What belongs there.** One directory per module, each extracted from that module's **Ekklesia
+Module Package**
+([ADR 0049](../docs/architecture/decisions/0049-module-package-v1.md)): one archive,
+`<id>-<version>-<target>.tar.gz`, and the SHA-256 published beside it. A package holds the module's
+generated `package.json`, its manifest, `ekklesia.package.json`, bundled backend code, built browser
+artifacts, migrations, and `THIRD_PARTY_NOTICES`
+([Module development](../docs/module-development/README.md#an-installed-module-is-self-contained)).
+Copying a module's `dist/` alone is not enough. Files are owned by root and readable by everyone
+(directories 755, files 644), so the API's unprivileged user can read them and never change them.
+The digest proves the archive is the one you were given; it does not prove who published it.
+
+**Nothing else belongs there.** Every non-hidden directory must be a valid module, or the API does
+not start. That includes `lost+found`, so if module storage is a file system of its own, mount it
+one level up and point `EKKLESIA_MODULES_HOST_DIR` at a directory inside it. Hidden entries are
+ignored, which is what makes staging possible.
+
+**Changes take effect only at a restart.** A running API never notices module storage changing, and
+never loads or unloads a module while it runs. Change module storage only while the API is stopped:
+it reads browser artifacts from disk as it serves them, so files changed under a running API would
+serve one version's browser code beside another's server code.
+
+To **install or update** a module, with `<id>` its module id and the package and its `.sha256` in
+the current directory, first **verify** it with the image's own verifier. It checks the archive's
+digest, its safety (no links, special files, or escaping paths), every file's digest, the package's
+identity, target, and Node.js range against this platform, runs the platform's module and migration
+validation, and loads the backend once in a short-lived process with no environment. Only then does
+it write the verified module directory, to a new directory outside module storage:
+
+The backend probe executes the package's server-side code; the verifier container is its isolation
+boundary. Keep the general-purpose `/tmp` mount `noexec`, and give only this one-shot verifier a
+separate executable scratch tmpfs. The mount below is ephemeral, bounded at 1100 MiB (just above the
+package format's 1 GiB expanded limit), `nodev`, `nosuid`, and writable only by the image's
+unprivileged `node` user. `EKKLESIA_MODULE_VERIFIER_SCRATCH_DIR` tells the CLI where that mount is;
+the verifier creates a unique child for each run and removes it on success or failure.
+
+```sh
+mkdir -m 777 staging        # writable by the image's unprivileged user; nothing else is
+docker run --rm --network none --read-only \
+  --tmpfs /tmp:rw,nosuid,nodev,noexec,size=64m \
+  --tmpfs /run/ekklesia-verifier:rw,nosuid,nodev,exec,size=1100m,mode=0700,uid=1000,gid=1000 \
+  --cap-drop ALL --security-opt no-new-privileges \
+  -e EKKLESIA_MODULE_VERIFIER_SCRATCH_DIR=/run/ekklesia-verifier \
+  -v "$PWD:/package:ro" -v "$PWD/staging:/staging" \
+  --entrypoint node "$EKKLESIA_IMAGE" core/dist/cli/verify-module-package.js \
+  /package/<id>-<version>-any.tar.gz --sha256-file /package/<id>-<version>-any.tar.gz.sha256 \
+  --extract-to /staging/<id>
+```
+
+Then install the verified directory:
+
+```sh
+docker compose stop api
+# Stage under a hidden name, which discovery ignores, then rename it into place in one step.
+sudo cp -R staging/<id> /var/lib/ekklesia/modules/.incoming-<id>
+sudo chown -R root:root /var/lib/ekklesia/modules/.incoming-<id>
+sudo chmod -R a+rX,go-w /var/lib/ekklesia/modules/.incoming-<id>
+sudo mv /var/lib/ekklesia/modules/<id> /var/lib/ekklesia/modules/.previous-<id>   # update only
+sudo mv /var/lib/ekklesia/modules/.incoming-<id> /var/lib/ekklesia/modules/<id>
+docker compose run --rm migrate node core/dist/cli/validate-modules.js
+docker compose run --rm migrate                                         # plan: review it
+docker compose run --rm migrate node core/dist/cli/apply-migrations.js  # only when the plan is right
+docker compose up -d --wait api
+```
+
+Back up before an update that brings migrations: migrations are forward-only. A newly installed
+module is enabled unless an administrator disabled it before; set its configuration and grants as
+its documentation says. Keep `.previous-<id>` until the update has proven itself, then delete it.
+
+To **remove** a module, stop the API, delete (or move away) its directory, and start the API again.
+Remove first any module that *requires* it, or the API refuses to start. Removing a module's code
+deletes nothing else. Its tables and rows, its buckets and objects, its enablement, configuration,
+Dashboard placement, and grants all stay. Its applied migration history stays too, and the
+migration plan and Doctor report it as `retained` history for a module that is not installed. That
+is information, not a problem, and it blocks no other migration. To stop a module without removing
+it, disable it instead (`set-module-enabled.js --disable`, [Operator commands](#operator-commands)).
+There is no purge: deleting a module's data is a separate operation that does not exist yet.
+
+To **restore** a removed module, verify and install its package again as above, at the same version
+or a newer one. It
+finds its data, its settings, and its history where it left them. Its history is strict again: a
+package that no longer contains a migration that was applied, or contains one with different
+contents, is refused by the migration plan, so an older version cannot be installed over newer data.
+
+Module storage is installation state: back it up with the database and the buckets.
+
 ### Upgrading
 
 1. **Pull or build the new image**, and change `EKKLESIA_IMAGE` in `deploy/.env`. Keep the old tag.
+   Installed modules stay where they are, in module storage.
 2. **Back up** ([Backups](#backups)).
-3. **Plan, review, then apply:** `docker compose run --rm migrate` with the new image, then
+3. **Check the installed modules against the new platform:**
+   `docker compose run --rm migrate node core/dist/cli/validate-modules.js`. A module whose
+   `compatibility.platform` range excludes the new version fails here, and would stop the API from
+   starting: update it first, or stay on the old image.
+4. **Plan, review, then apply:** `docker compose run --rm migrate` with the new image, then
    `docker compose run --rm migrate node core/dist/cli/apply-migrations.js`.
-4. **Restart on the new image:** `docker compose -f compose.yaml -f compose.proxy.yaml up -d --wait`.
+5. **Restart on the new image:** `docker compose -f compose.yaml -f compose.proxy.yaml up -d --wait`.
 
 ### Rolling back
 
 Set `EKKLESIA_IMAGE` back to the previous tag and run `up -d --wait` again. That is enough only when
-the upgrade applied no migrations (the plan in step 3 showed none pending). Migrations are
+the upgrade applied no migrations (the plan in step 4 showed none pending). Migrations are
 forward-only. If any were applied, restore the backup taken in step 2 before starting the previous
-image, because it was not built for the newer schema.
+image, because it was not built for the newer schema. Module storage is not part of the image, so a
+rollback does not change installed modules.
 
 ### Backups
 
 Slice 6 adds the scheduled backup job and the restore procedure (ADR 0044, Backups). Until then,
-take a `pg_dump` and a copy of every bucket before each upgrade by hand.
+take a `pg_dump`, a copy of every bucket, and a copy of module storage before each upgrade by hand.
 
 ### Split Dashboard and API origins
 
@@ -309,9 +419,13 @@ deployment:
 
 - `pnpm deploy:config` validates the base, base + proxy, and base + proxy + tunnel with the example
   env files. CI runs it in `pnpm ci:verify`.
-- `pnpm deploy:smoke` (`scripts/smoke-deploy.sh`) runs the whole deployment end to end, against a
+- `bash scripts/check-image.sh` builds the image and proves it is generic: no `/opt/ekklesia/modules`,
-  platform-only image and a disposable PostgreSQL and SeaweedFS that exist only for that run. It
+  no module template, no `ekklesia.module.json` outside installed dependencies, an empty root-owned
-  follows the first boot above and checks the following through the proxy:
+  `/var/lib/ekklesia/modules`, and `EKKLESIA_MODULES_DIR` set. It then builds again from a checkout
+  with a populated `modules/` directory and requires an identical runtime file system. CI runs it.
+- `pnpm deploy:smoke` (`scripts/smoke-deploy.sh`) runs the whole deployment end to end, against the
+  generic image, empty module storage, and a disposable PostgreSQL and SeaweedFS that exist only for
+  that run. It follows the first boot above and checks the following through the proxy:
   - readiness and the Dashboard;
   - a signed object URL fetched through the storage hostname, and the same image loaded twice over
     HTTP/2, the second time as a conditional request that must be a clean `304`;
@@ -324,12 +438,22 @@ deployment:
   - Doctor.
 
   `EKKLESIA_SMOKE_TOPOLOGY=split` runs the [split topology](#split-dashboard-and-api-origins)
-  instead: an image with the repository's module template installed as a test-only module, every
+  instead, on the **same generic image**, and also proves [Installed modules](#installed-modules)
-  hostname's served and refused paths, exact CORS for the Dashboard's origin and none for others,
+  end to end:
-  and then a real headless Chromium (pinned by digest, driven over the DevTools protocol) that signs
+  - the image boots with no module;
-  in on the Dashboard's hostname, checks the session cookie lives only on the API's, mounts the
+  - the repository's module template, packaged as an Ekklesia Module Package v1 by the canonical
-  module's UI from the API's origin and sees its own credentialed requests succeed, mounts its display
+    packager, is verified by the image itself and installed into module storage, its migration is
-  on the API's hostname with its service worker, and signs out.
+    planned and explicitly applied, the API restarts, and the module reads data it owns;
+  - every hostname's served and refused paths, exact CORS for the Dashboard's origin and none for
+    others;
+  - a real headless Chromium (pinned by digest, driven over the DevTools protocol) signs in on the
+    Dashboard's hostname, checks the session cookie lives only on the API's, mounts the module's UI
+    from the API's origin and sees its own credentialed requests succeed, mounts its display on the
+    API's hostname with its service worker, and signs out;
+  - the module is removed and the API restarted: Core still runs, the module's routes are gone,
+    migration planning and applying succeed and report its retained history, and its data is intact;
+  - the exact same package is verified and installed again and the API restarted: its history
+    validates strictly and it returns its previous data.
 
   CI runs both topologies on every change.
 - **Test-only:** the smoke test runs Caddy with its internal CA (`local_certs`), because a test run
@@ -350,44 +474,47 @@ is no second image and no second build.
 
 ### What it builds
 
-The build context is an **already-assembled workspace**: this repository, plus zero or more module
+The build context is **this repository**, and the image is the same for every installation
-packages already present in `modules/<id>`, plus a `pnpm-lock.yaml` describing exactly that set.
+([ADR 0048](../docs/architecture/decisions/0048-generic-image-and-installed-module-storage.md)). It
-The Dockerfile clones nothing and chooses no modules. It builds what it is given. With no
+contains **zero feature modules**: installed modules live in module storage outside it
-`modules/` directory, it builds the platform alone; CI builds that case on every change.
+([Installed modules](#installed-modules)). No input is specific to an installation: no module list,
+no lockfile of its own, no branding, no configuration.
 
-Assembling the context (checking out the platform at a release tag, each module at a pinned tag or
+A `modules/` directory in the checkout never reaches the image. `.dockerignore` keeps it out of the
-commit, and the instance's own lockfile) belongs to the installation's instance composition, not to
+build context, and the build refuses a context that still contains one. The module template is a
-this file.
+workspace package, so it is built and validated with everything else, but neither its files nor its
+dependencies reach the runtime image. `scripts/check-image.sh` proves all of this on every change
+([Testing this deployment](#testing-this-deployment)).
 
 | Stage | Does |
 | --- | --- |
 | `base` | `node:24.18.0-trixie-slim`, pinned by its multi-architecture index digest. Debian, so glibc, because module dependencies such as sharp ship glibc prebuilt binaries. Every stage starts here. |
 | `toolchain` | Enables pnpm through Corepack, at exactly the root `packageManager` version. |
-| `manifests` | Collects the lockfile, workspace configuration, `.npmrc`, and every workspace `package.json` at its repository path. |
+| `manifests` | Collects the lockfile, workspace configuration, `.npmrc`, and the `package.json` of every platform package (not the module template's) at its repository path. |
-| `build` | `pnpm install --frozen-lockfile`, then `pnpm boundaries`, `pnpm modules:validate`, `pnpm migrations:validate`, and `pnpm build`, against exactly the modules in the context. Never uses host `node_modules`: `.dockerignore` excludes them. |
+| `build` | Refuses a context containing `modules/`, then `pnpm install --frozen-lockfile`, `pnpm boundaries`, `pnpm modules:validate`, `pnpm migrations:validate`, and `pnpm build`. Never uses host `node_modules`: `.dockerignore` excludes them. |
-| `prod-deps` | The same lockfile with `--prod`: production dependencies only. |
+| `prod-deps` | The same lockfile with `--prod`, for the platform packages only: production dependencies only. |
-| `runtime` | Production dependencies plus built outputs, owned by root and run as the unprivileged `node` user (uid 1000). No pnpm, no compiler, no curl. |
+| `runtime` | Production dependencies plus built outputs, owned by root and run as the unprivileged `node` user (uid 1000), and an empty, root-owned `/var/lib/ekklesia/modules`. No pnpm, no compiler, no curl. |
 
 The runtime keeps the repository layout at `/opt/ekklesia`, because that layout is how the platform
 finds its files:
 
 - the API takes the repository root as three directories above `apps/api/dist/`, and reads
-  `package.json`, `packages/module-sdk/package.json`, and `modules/` beneath it;
+  `package.json` and `packages/module-sdk/package.json` beneath it;
 - every CLI takes its **working directory** as the root and also reads Core's migrations in
   `core/drizzle/`, so commands must run from `/opt/ekklesia`, the image's `WORKDIR`;
 - the Dashboard and display host files are read from `surfaces/shell/dist/browser/`;
-- each module directory is copied whole, minus `node_modules`, because each manifest names its
+- installed modules are read from `EKKLESIA_MODULES_DIR`, `/var/lib/ekklesia/modules`, never from
-  own entrypoints, UI artifacts, and migrations directory.
+  under `/opt/ekklesia`. With nothing mounted there, the image runs with no modules.
 
 ### Building
 
 ```sh
 docker build \
   --file deploy/Dockerfile \
-  --build-arg VERSION=0.1.2 \
+  --build-arg VERSION=0.2.4 \
   --build-arg REVISION="$(git rev-parse HEAD)" \
   --build-arg SOURCE=https://git.example.org/your-org/ekklesia \
-  --tag ekklesia:0.1.2 \
+  --tag ekklesia:0.2.4 \
   .
 ```
 
@@ -399,30 +526,37 @@ set `DOCKER_BUILDKIT=1` if your Docker CLI has no buildx plugin.
 No secret is a build argument, and none enters any layer. `.env` files are excluded from the build
 context entirely, and no registry credentials are needed.
 
-**A module missing a production dependency fails the build, not the API.** The runtime receives
+### The runtime an installed module targets
-production dependencies only, so a module that imports a package at run time but declares it only
-as a development or peer dependency would build and then fail at startup. `pnpm boundaries` runs
-in the build stage and rejects that module first
-(`runtime-imports-are-production-dependencies`, see
-[Repository boundaries](../docs/architecture/repository-boundaries.md)). The same applies to every
-other boundary rule: a module the platform's own CI would reject cannot be built into an image.
 
-**A platform-only image does not exercise native module dependencies.** With no modules in the
+An installed module runs on the image's Node.js, inside the API process, from its own directory
-context, nothing like sharp is installed, so the CI image build proves nothing about them. An
+([ADR 0048](../docs/architecture/decisions/0048-generic-image-and-installed-module-storage.md)):
-instance build that includes such a module must smoke-test the built image itself: start it,
+
-confirm `/api/v1/health/ready` answers `200`, and exercise the module's native code path (for
+- **Node.js 24.18.0 on Debian 13, so glibc**, for the architecture the image was built for. A native
-example, process one image).
+  dependency such as sharp must be built or downloaded for exactly that.
+- **Its own dependencies only.** Node resolves a module's imports from the module's directory, and
+  the platform's `node_modules` is never on that path. A module whose server code imports something
+  its directory does not contain stops the API from starting, with a sanitized
+  `MODULE_RUNTIME_IMPORT_FAILED`.
+- **The platform's exact Drizzle version, for now.** Core runs a module's queries through its own
+  Drizzle instance over tables the module defined with its own copy, so the two copies must be
+  interchangeable. That is a constraint of the current implementation, not a permanent contract.
+
+The repository's boundary checks (`pnpm boundaries`) prove only the source modules in a workspace.
+An installed module's conformance is its own CI's job, so check a module before installing it:
+`validate-modules.js` ([Operator commands](#operator-commands)) validates what can be checked on an
+installed directory, and the API's startup refuses anything it cannot load.
 
 ### Configuration
 
 Configuration comes **only from the container environment**, never from a file inside the image.
-The image sets exactly three variables itself:
+The image sets exactly four variables itself:
 
 | Variable | Image value | Why |
 | --- | --- | --- |
 | `NODE_ENV` | `production` | Stated rather than relied on. Anything other than `development` already validates as production. |
 | `EKKLESIA_API_HOST` | `0.0.0.0` | Reachable from other containers. Outside a container the platform default stays `127.0.0.1`. |
 | `EKKLESIA_API_PORT` | `3000` | The platform default, made explicit; `EXPOSE 3000`. |
+| `EKKLESIA_MODULES_DIR` | `/var/lib/ekklesia/modules` | Where installed modules are read from (ADR 0048). Outside a container, unset means the checkout's own `modules/`. Compose states the same value beside the mount. |
 
 Everything else is the ordinary host configuration in
 [API § Required configuration](../docs/development/api.md#required-configuration), supplied by the
@@ -443,8 +577,8 @@ Never publish the API's port to the host or the Internet. Only the proxy publish
 - **Read-only:** the image was verified under exactly these flags. The API reached `healthy`, and
   the migration and Doctor commands ran. Nothing wrote to `/tmp`, which stays mounted as headroom
   for module code that needs scratch space. The installation, `/home/node` included, is not
-  writable, so anything that needs a writable path other than `/tmp` is a defect to report, not to
+  writable, and neither is module storage, which is mounted read-only. Anything that needs a
-  work around.
+  writable path other than `/tmp` is a defect to report, not to work around.
 
 ### Health
 
@@ -482,14 +616,17 @@ reports direct mode for an API that trusts its proxy. The running API's own valu
 | Apply migrations | `docker compose run --rm migrate node core/dist/cli/apply-migrations.js` |
 | Doctor (read-only report) | `docker compose run --rm migrate node core/dist/cli/doctor.js` |
 | Create the initial owner (interactive) | `docker compose run --rm -it migrate node core/dist/cli/create-initial-owner.js --email [email protected]` |
+| Validate the installed modules (read-only) | `docker compose run --rm migrate node core/dist/cli/validate-modules.js` |
+| Verify a module package (read-only unless extracting) | `node core/dist/cli/verify-module-package.js <archive> --sha256-file <archive>.sha256 [--extract-to <new directory>]`, in a `docker run` of the image ([Installed modules](#installed-modules)) |
 | Enable or disable a module | `docker compose run --rm migrate node core/dist/cli/set-module-enabled.js --enable --module <id>` (or `--disable`) |
 
-The plan, apply, Doctor, and initial-owner commands are exercised by the smoke test; module
+Every command reads installed modules from the same `EKKLESIA_MODULES_DIR` the API does. The plan,
-enablement is not.
+apply, Doctor, and initial-owner commands are exercised by the smoke test, and so are installing,
+removing, and restoring a module; module validation and enablement are not.
 
 ### Size
 
-The platform-only image is about 378 MB: the Debian slim Node base (about 230 MB), production
+The image is about 378 MB, and it contains no module: the Debian slim Node base (about 230 MB), production
 dependencies (about 141 MB), and built outputs (about 6 MB). A rebuild that reuses a warm pnpm store
 cache can come out about 21 MB larger. When esbuild's install script runs, it hard-links its
 `bin/esbuild` to the native binary it ships beside it; when pnpm restores esbuild from the store's

deploy/compose.yaml

@@ -32,8 +32,20 @@ x-ekklesia-app: &ekklesia-app
     # without any storage TLS exception. The database CA travels separately, as PEM text in
     # EKKLESIA_DATABASE_CA, and is the only CA the database connection trusts.
     NODE_EXTRA_CA_CERTS: /run/ekklesia/tls/ca.crt
+    # Installed modules (ADR 0048). The image sets the same value; stating it beside the mount below
+    # keeps the variable and the mount target from ever drifting apart.
+    EKKLESIA_MODULES_DIR: /var/lib/ekklesia/modules
   volumes:
     - ${EKKLESIA_TLS_DIR:-/etc/ekklesia/tls}/ca.crt:/run/ekklesia/tls/ca.crt:ro
+    # Installation-owned module storage, outside the image (ADR 0048). Read-only: Ekklesia never
+    # writes installed code. The host directory must already exist; a missing one stops the
+    # container from starting instead of Compose quietly creating an empty, root-owned directory.
+    - type: bind
+      source: ${EKKLESIA_MODULES_HOST_DIR:-/var/lib/ekklesia/modules}
+      target: /var/lib/ekklesia/modules
+      read_only: true
+      bind:
+        create_host_path: false
   networks:
     data: {}
     storage: {}
@@ -120,6 +132,10 @@ services:
     command:
       - mini
       - -dir=/data
+      # A bucket is a SeaweedFS collection and claims a block of volumes. The ~1 GB automatic
+      # volume size leaves modest hosts with room for only a few collections; after that, writes
+      # stall instead of failing. This changes allocation granularity, not object or total capacity.
+      - -master.volumeSizeLimitMB=32
       - -s3.port.https=8443
       - -s3.cert.file=/run/ekklesia/tls/object-storage.crt
       - -s3.key.file=/run/ekklesia/tls/object-storage.key