feat: one generic image, with installed modules in installation-owned storage (ADR 0048)

The production image now contains zero feature modules and is the same for every
installation. Installed modules live in module storage that one Core resolver
selects from EKKLESIA_MODULES_DIR: the checkout's modules/ when unset, an
absolute path that must exist when set (/var/lib/ekklesia/modules in the image).
A relative, blank, missing, or unreadable configured directory fails closed with
a sanitized error that never contains the value.

- Host configuration reads EKKLESIA_MODULES_DIR. The API, migration plan, apply
  and validate, module validation, module enablement, and Doctor all resolve it
  the same way; the test-only API override still takes precedence.
- Doctor receives Core's migrations directory explicitly instead of deriving it
  from the modules directory's parent.
- The migration runner retains and reports the applied history of a module that
  is not installed, and plans and applies Core's and present modules' migrations
  around it. Core's history and every installed module's history stay strict: a
  missing or changed applied migration, or a downgrade, still fails. No down
  migrations, no data deletion.
- deploy/Dockerfile copies no module and installs nothing for the module
  template; .dockerignore excludes modules/ and the build refuses a context that
  contains it; the runtime has an empty root-owned /var/lib/ekklesia/modules and
  sets EKKLESIA_MODULES_DIR.
- deploy/compose.yaml bind-mounts EKKLESIA_MODULES_HOST_DIR read-only into api
  and migrate, with create_host_path disabled.
- scripts/check-image.sh proves the image holds no modules and that a populated
  modules/ directory leaves its runtime file system identical; CI runs it.
- The split deploy smoke now uses the same generic image: it boots with no
  modules, installs a self-contained test module packaged from the template
  (test-only), migrates and restarts, removes it (Core runs, planning reports the
  retained history, data survives), and restores it with its data.

Docs: deploy README (module storage, install/update/remove/restore, the runtime
modules target), .env.example, API configuration, module development guide,
testing, workflow, security, and the architecture overview.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

scripts/lib/deploy-smoke-client.mjs

@@ -6,6 +6,9 @@
 //   node deploy-smoke-client.mjs edge     an ordinary, untrusted peer of the proxy
 //   node deploy-smoke-client.mjs tunnel   the Cloudflare Tunnel connector's fixed address
 //   node deploy-smoke-client.mjs session  the initial owner signing in and out through the proxy
+//   node deploy-smoke-client.mjs module   the test module `example` as the initial owner sees it:
+//                                          SMOKE_MODULE_EXPECT is "absent", or a JSON array of the
+//                                          exact values its records route must return (ADR 0048)
 //
 // Either topology (ADR 0045): SMOKE_HOSTNAME is the API's hostname, and SMOKE_DASHBOARD_HOSTNAME,
 // when set, the Dashboard's. Unset means the same-origin topology, where both are one hostname. Every
@@ -443,14 +446,72 @@ async function sessionChecks() {
   );
 }
 
+/** Signs the initial owner in, through the proxy, and returns the session cookie. */
+async function ownerCookie() {
+  const signIn = await fetch(`${apiOrigin}/api/auth/sign-in/email`, {
+    body: JSON.stringify({
+      email: required("SMOKE_OWNER_EMAIL"),
+      password: required("SMOKE_OWNER_PASSWORD"),
+    }),
+    headers: { "content-type": "application/json", origin: dashboardOrigin },
+    method: "POST",
+  });
+  await signIn.arrayBuffer();
+  check(signIn.status === 200, "the initial owner signs in");
+  return (signIn.headers.get("set-cookie") ?? "").split(";")[0] ?? "";
+}
+
+/**
+ * The installed-module checks (ADR 0048): whether `example` is in the module inventory, and what
+ * its own route returns. Absent, it is in no inventory and its routes are not mounted at all;
+ * present, its records route returns exactly the expected values, which proves its tables, its
+ * dependencies, and the platform's database facade all work from module storage.
+ */
+async function moduleChecks() {
+  const expectation = required("SMOKE_MODULE_EXPECT");
+  const cookie = await ownerCookie();
+  const headers = { cookie, origin: dashboardOrigin };
+
+  const inventory = await fetch(`${apiOrigin}/api/v1/module-ui`, { headers });
+  const inventoryBody = await inventory.json();
+  const installed =
+    inventory.status === 200 && inventoryBody.modules.some((module) => module.id === "example");
+  const records = await fetch(`${apiOrigin}/api/v1/modules/example/records`, { headers });
+
+  if (expectation === "absent") {
+    check(inventory.status === 200 && !installed, "the module inventory has no `example` module");
+    check(
+      records.status === 404 && (await records.text()) === '{"code":"NOT_FOUND"}',
+      "the absent module's routes are not mounted",
+    );
+  } else {
+    const expected = JSON.parse(expectation);
+    check(installed, "the module inventory lists the `example` module");
+    const values = records.status === 200 ? (await records.json()).map((row) => row.value) : null;
+    check(
+      JSON.stringify(values) === JSON.stringify(expected),
+      `the module's records route returns ${JSON.stringify(expected)}`,
+    );
+  }
+
+  const signOut = await fetch(`${apiOrigin}/api/auth/sign-out`, {
+    body: "{}",
+    headers: { ...headers, "content-type": "application/json" },
+    method: "POST",
+  });
+  await signOut.arrayBuffer();
+}
+
 if (mode === "edge") {
   await edgeChecks();
 } else if (mode === "tunnel") {
   await tunnelChecks();
 } else if (mode === "session") {
   await sessionChecks();
+} else if (mode === "module") {
+  await moduleChecks();
 } else {
-  throw new Error('Mode must be "edge", "tunnel", or "session".');
+  throw new Error('Mode must be "edge", "tunnel", "session", or "module".');
 }
 
 if (failures > 0) {