diff --git a/README.md b/README.md
index bd5f06c..175501d 100644
--- a/README.md
+++ b/README.md
@@ -44,8 +44,12 @@ selected by `EKKLESIA_MODULES_DIR` (`/var/lib/ekklesia/modules` in the image, th
 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. Purge, a package format,
-signing, and any installer or marketplace do not exist yet.
+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. Only the portable `any` target exists
+so far. Purge, native-target packages, signing, and any installer or marketplace do not exist yet.
 
 Phase 4A added Core-owned identity foundations: a Core-owned Better Auth database schema
 (`ekklesia_core_user`, `ekklesia_core_session`, `ekklesia_core_account`,
diff --git a/core/src/cli/verify-module-package.ts b/core/src/cli/verify-module-package.ts
new file mode 100644
index 0000000..6b88808
--- /dev/null
+++ b/core/src/cli/verify-module-package.ts
@@ -0,0 +1,175 @@
+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 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();
+}
+
+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));
+  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,
+    ...(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;
+  });
+}
diff --git a/core/src/modules/index.ts b/core/src/modules/index.ts
index 0350420..020f131 100644
--- a/core/src/modules/index.ts
+++ b/core/src/modules/index.ts
@@ -8,6 +8,7 @@ export * from "./lifecycle-schema.js";
 export * from "./lifecycle-store.js";
 export * from "./migration-discovery.js";
 export * from "./modules-directory.js";
+export * from "./module-package-verification.js";
 export * from "./permissions.js";
 export * from "./realtime.js";
 export * from "./runtime.js";
diff --git a/core/src/modules/module-package-archive.ts b/core/src/modules/module-package-archive.ts
new file mode 100644
index 0000000..5ded35a
--- /dev/null
+++ b/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 });
+}
diff --git a/core/src/modules/module-package-probe.ts b/core/src/modules/module-package-probe.ts
new file mode 100644
index 0000000..66e68a3
--- /dev/null
+++ b/core/src/modules/module-package-probe.ts
@@ -0,0 +1,89 @@
+// 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 with no relative imports, so Node can run the source file directly
+// in tests as well as the compiled file in the image.
+import { pathToFileURL } from "node:url";
+import { parseModuleRuntimeDefinition, parseModuleSchemaDefinition } from "@ekklesia/contracts";
+
+interface ProbeRequest {
+  readonly moduleId: string;
+  readonly version: string;
+  readonly entrypoints: Readonly<Record<string, string>>;
+}
+
+interface ProbeFailure {
+  readonly role: string;
+  readonly reason: "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 });
+        }
+      } else if (role === "schema") {
+        const definition = 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" }] }),
+  );
+}
diff --git a/core/src/modules/module-package-verification.ts b/core/src/modules/module-package-verification.ts
new file mode 100644
index 0000000..c1570fa
--- /dev/null
+++ b/core/src/modules/module-package-verification.ts
@@ -0,0 +1,479 @@
+import { fork } from "node:child_process";
+import { createHash } from "node:crypto";
+import { chmod, mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import {
+  isVersionCompatible,
+  MODULE_PACKAGE_ANY_TARGET,
+  MODULE_PACKAGE_FORMAT,
+  MODULE_PACKAGE_METADATA_FILENAME,
+  type ModuleManifest,
+  type ModulePackageMetadata,
+  safeParseModuleManifest,
+  safeParseModulePackageMetadata,
+  safeParseModulePackageRuntimePackage,
+} from "@ekklesia/contracts";
+import { discoverModules, MODULE_MANIFEST_FILENAME, ModuleDiscoveryError } from "./discovery.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_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_MANIFEST_INVALID"
+  | "MODULE_PACKAGE_METADATA_INVALID"
+  | "MODULE_PACKAGE_METADATA_MISSING"
+  | "MODULE_PACKAGE_MODULE_INVALID"
+  | "MODULE_PACKAGE_NATIVE_FILE"
+  | "MODULE_PACKAGE_RUNTIME_INCOMPATIBLE"
+  | "MODULE_PACKAGE_RUNTIME_PACKAGE_INVALID"
+  | "MODULE_PACKAGE_SDK_INCOMPATIBLE"
+  | "MODULE_PACKAGE_TARGET_INCOMPATIBLE"
+  | "MODULE_PACKAGE_TRANSITIONAL_UNSUPPORTED";
+
+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_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_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.",
+  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_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;
+}
+
+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;
+  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 {
+  // This verifier implements the portable target only. Native targets are a later slice.
+  if (metadata.target !== MODULE_PACKAGE_ANY_TARGET) {
+    fail("MODULE_PACKAGE_TARGET_INCOMPATIBLE");
+  }
+  if ([...files.keys()].some((filePath) => filePath.toLowerCase().endsWith(".node"))) {
+    fail("MODULE_PACKAGE_NATIVE_FILE");
+  }
+  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");
+  }
+  // Transitional (ADR 0049): today a module's Drizzle copy must be interchangeable with the
+  // platform's, because Core queries the module's tables with its own Drizzle instance. This is an
+  // implementation constraint pending a Module Database ABI, not that ABI.
+  for (const [runtime, version] of Object.entries(metadata.transitional?.databaseRuntime ?? {})) {
+    if (platform.databaseRuntime[runtime] !== version) {
+      fail("MODULE_PACKAGE_DATABASE_RUNTIME_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)}`);
+}
+
+/** 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(
+  moduleId: string,
+  version: string,
+  entrypoints: Readonly<Record<string, string>>,
+  timeoutMs: number,
+): 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({ entrypoints, moduleId, version })], {
+        cwd: tmpdir(),
+        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 mkdtemp(path.join(tmpdir(), "ekklesia-package-verify-"));
+  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(
+      metadata.module.id,
+      metadata.module.version,
+      entrypoints,
+      options.loadTimeoutMs ?? 30_000,
+    );
+    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,
+  });
+}
diff --git a/core/tests/module-package-verification.test.ts b/core/tests/module-package-verification.test.ts
new file mode 100644
index 0000000..153cf88
--- /dev/null
+++ b/core/tests/module-package-verification.test.ts
@@ -0,0 +1,387 @@
+import { 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 {
+  type ModulePackageVerificationErrorCode,
+  ModulePackageVerificationError,
+  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: "0.1.2",
+  platformVersion: "0.1.2",
+} 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 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] };
+}
+
+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: 8,
+      moduleId: "example",
+      target: "any",
+      version: "0.1.0",
+    });
+  });
+
+  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("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("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("fails a target this platform cannot run", async () => {
+    await rejection(
+      {
+        metadata: (metadata) => ({
+          ...metadata,
+          target: "linux-arm64-musl",
+          runtime: { 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",
+    });
+  });
+
+  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",
+    });
+  });
+});
diff --git a/core/tests/support/module-package-fixture.ts b/core/tests/support/module-package-fixture.ts
new file mode 100644
index 0000000..bc051b5
--- /dev/null
+++ b/core/tests/support/module-package-fixture.ts
@@ -0,0 +1,205 @@
+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 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[];
+}
+
+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, {
+      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"));
+
+  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 },
+    target: "any",
+    runtime: { node: ">=20" },
+    provenance: {
+      revision: "86ae907f59458508e3277666cdd214f5bd7c1078",
+      packager: { name: "@ekklesia/module-pack", version: "0.1.2" },
+    },
+    incorporates: { "@ekklesia/module-sdk": "0.1.2" },
+    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) };
+}
diff --git a/core/tests/verify-module-package-cli.test.ts b/core/tests/verify-module-package-cli.test.ts
new file mode 100644
index 0000000..853bfd6
--- /dev/null
+++ b/core/tests/verify-module-package-cli.test.ts
@@ -0,0 +1,75 @@
+import { readFile } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { describe, expect, it } from "vitest";
+import {
+  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 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,
+    });
+  });
+});
diff --git a/deploy/README.md b/deploy/README.md
index 1ed0d00..14c739d 100644
--- a/deploy/README.md
+++ b/deploy/README.md
@@ -142,12 +142,16 @@ Installed modules live on the host, in module storage: `/var/lib/ekklesia/module
 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 a self-contained installed module: its
-`package.json`, `ekklesia.module.json`, built artifacts, migrations, and the production
-dependencies its server code imports, in its own `node_modules`
+**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
@@ -159,12 +163,28 @@ never loads or unloads a module while it runs. Change module storage only while
 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:
+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:
+
+```sh
+mkdir -m 777 staging        # writable by the image's unprivileged user; nothing else is
+docker run --rm --network none --read-only --tmpfs /tmp \
+  -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 ./<id> /var/lib/ekklesia/modules/.incoming-<id>
+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
@@ -188,7 +208,8 @@ is information, not a problem, and it blocks no other migration. To stop a modul
 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, install it again as above, at the same version or a newer one. It
+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.
@@ -409,10 +430,9 @@ deployment:
   instead, on the **same generic image**, and also proves [Installed modules](#installed-modules)
   end to end:
   - the image boots with no module;
-  - the repository's module template, packaged as a self-contained test module
-    (`scripts/lib/test-module-package.Dockerfile`, test-only and not a package format), is installed
-    into module storage, its migration is planned and explicitly applied, the API restarts, and the
-    module reads data it owns;
+  - the repository's module template, packaged as an Ekklesia Module Package v1 by the canonical
+    packager, is verified by the image itself and installed into module storage, its migration is
+    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
@@ -421,8 +441,8 @@ deployment:
     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 module is restored and the API restarted: its history validates strictly and it returns its
-    previous data.
+  - 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
@@ -586,6 +606,7 @@ reports direct mode for an API that trusts its proxy. The running API's own valu
 | 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 owner@example.org` |
 | 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`) |
 
 Every command reads installed modules from the same `EKKLESIA_MODULES_DIR` the API does. The plan,
diff --git a/docs/architecture/decisions/0049-module-package-v1.md b/docs/architecture/decisions/0049-module-package-v1.md
index c15005c..2a8ecad 100644
--- a/docs/architecture/decisions/0049-module-package-v1.md
+++ b/docs/architecture/decisions/0049-module-package-v1.md
@@ -1,6 +1,6 @@
 # 0049: A module release is one immutable, self-contained package: Ekklesia Module Package v1
 
-- Status: Proposed
+- Status: Accepted
 - Date: 2026-10-07
 - Supersedes: none
 - Extends: [0048](0048-generic-image-and-installed-module-storage.md)
diff --git a/docs/architecture/decisions/README.md b/docs/architecture/decisions/README.md
index b7ac19d..4fd6b13 100644
--- a/docs/architecture/decisions/README.md
+++ b/docs/architecture/decisions/README.md
@@ -57,4 +57,4 @@ ADRs capture durable choices that affect more than one package or phase.
 - [0046: Ekklesia's branding is never forced on an installation](0046-installation-owned-branding.md) — Proposed
 - [0047: Every module proves itself inside Ekklesia, with one harness the platform publishes](0047-module-ci-harness.md) — Proposed
 - [0048: Ekklesia ships one generic image, and installed modules live outside it](0048-generic-image-and-installed-module-storage.md) — Accepted
-- [0049: A module release is one immutable, self-contained package: Ekklesia Module Package v1](0049-module-package-v1.md) — Proposed
+- [0049: A module release is one immutable, self-contained package: Ekklesia Module Package v1](0049-module-package-v1.md) — Accepted
diff --git a/docs/architecture/platform-architecture.md b/docs/architecture/platform-architecture.md
index 9463192..06efa2c 100644
--- a/docs/architecture/platform-architecture.md
+++ b/docs/architecture/platform-architecture.md
@@ -672,3 +672,18 @@ artifact from what an installation installs:
   module that lost or changed an applied migration is still refused.
 - **Trust is unchanged.** Installed modules are still trusted code; module storage is mounted
   read-only, which keeps Ekklesia from modifying installed code but does not sandbox it.
+
+[ADR 0049](decisions/0049-module-package-v1.md) defines how a module is distributed: one Ekklesia
+Module Package v1, a deterministic `.tar.gz` with its SHA-256.
+
+- **The packager.** `@ekklesia/module-pack` bundles the module's backend with every pure-JavaScript
+  dependency, the SDK, contracts, and Drizzle included. It copies the built browser artifacts and
+  migrations, generates the runtime `package.json`, `ekklesia.package.json` with every file's digest,
+  and `THIRD_PARTY_NOTICES`, and writes the archive.
+- **The verifier.** Core's `verifyModulePackage` reads the archive in memory and refuses links,
+  special files, and escaping paths. It checks every digest and identity, the target and runtime,
+  and the transitional Drizzle agreement, runs the platform's own module and migration validation,
+  and loads the backend once in a short-lived process with an empty environment. Only then does it
+  extract anything.
+- **What exists today.** Only the `any` target. Drizzle agreement is recorded as transitional, not a
+  database ABI.
diff --git a/docs/development/security.md b/docs/development/security.md
index 316fb97..2616bef 100644
--- a/docs/development/security.md
+++ b/docs/development/security.md
@@ -479,7 +479,12 @@ Installed modules come from installation-owned module storage, which the referen
 is an integrity property, not a sandbox: an installed module is still trusted code with the API's
 database role, exactly as above. The repository's boundary checks prove only source modules in a
 workspace, and an installed package usually ships none, so installing one means trusting that
-module's own CI and whoever placed it in module storage.
+module's own CI and whoever placed it in module storage. A Module Package v1 (ADR 0049) is verified
+before it is installed: its digest, its archive safety (no links, special files, setuid bits, or
+escaping paths), every file's digest, and its identity and compatibility. The digest proves
+integrity, not who published the package; signing is not implemented. The verifier loads the backend
+in a short-lived process with an empty environment, so module code never sees a database URL or a
+secret while it is being checked.
 
 Two production defaults are relevant but are **not** by themselves a deployment guarantee:
 
diff --git a/docs/development/testing.md b/docs/development/testing.md
index c3e1189..d532911 100644
--- a/docs/development/testing.md
+++ b/docs/development/testing.md
@@ -564,6 +564,29 @@ the following pull-request status context to `main` branch protection:
 CI / migration-smoke (pull_request)
 ```
 
+## Module packages
+
+Ekklesia Module Package v1 (ADR 0049) is proven at three levels, all in `pnpm verify`:
+
+- `packages/contracts/tests/module-package.test.ts`: the `ekklesia.package.json` schema, target
+  names, and the generated runtime `package.json`.
+- `core/tests/module-package-verification.test.ts`: the verifier against hand-built archives,
+  including what the packager never produces. A valid package verifies and extracts with normalized
+  modes. A wrong digest, a corrupted or missing or unlisted file, disagreeing identities, an unknown
+  format, unknown transitional metadata, an incompatible target, Node.js range, SDK, or database
+  runtime, a missing entrypoint, a backend that imports something the package lacks, absolute and
+  `..` paths, symbolic and hard links, device nodes and FIFOs, setuid and setgid entries, a second
+  top-level directory, and a duplicate entry each fail with their own sanitized code. The backend
+  load check runs in a real child process.
+- `packages/module-pack/tests/`: the packager against generated fixture modules (payload contents,
+  generated `package.json`, metadata, bundled backend with only built-in imports, refusal of native
+  and platform-specific dependencies and of unknown or textless licences, notices, byte-identical
+  archives, normalized tar and gzip headers), and end to end against the built module template:
+  packed twice to identical bytes without changing the workspace's install state, verified by Core's
+  verifier, extracted elsewhere, and loaded with Node's own resolution hooks proving nothing outside
+  the package is resolved. Turbo builds the template and Core first, and runs the template's own
+  tests (which rebuild its UI in place) before these.
+
 ## The generic platform image and the reference deployment
 
 These need Docker and build images locally; nothing is pushed or published.
@@ -581,13 +604,13 @@ These need Docker and build images locally; nothing is pushed or published.
 - `pnpm deploy:smoke` (`scripts/smoke-deploy.sh`) runs the reference deployment end to end on the
   generic image with empty module storage. With `EKKLESIA_SMOKE_TOPOLOGY=split`, the same image also
   runs the installed-module lifecycle:
-  - the module template, packaged as a self-contained test module
-    (`scripts/lib/test-module-package.Dockerfile`, test-only), is installed into module storage;
+  - the module template is packaged by the canonical packager (Module Package v1, ADR 0049),
+    verified by the image's own verifier, and installed into module storage;
   - its migration is planned and explicitly applied, and the API restarted;
   - a real browser mounts it;
   - it is removed and the API restarted, and Core still runs, migrations still plan and apply, and
     its data survives;
-  - it is restored, with its data.
+  - the exact same package is verified and installed again, and the module returns with its data.
 
   See [deploy/README.md](../../deploy/README.md#testing-this-deployment).
 
diff --git a/docs/module-development/README.md b/docs/module-development/README.md
index c84fb03..49ba1f0 100644
--- a/docs/module-development/README.md
+++ b/docs/module-development/README.md
@@ -78,42 +78,79 @@ names (`/var/lib/ekklesia/modules` in the production image, the checkout's `modu
 unset). Discovery reads it only when a process starts. Nothing is hot loaded, and an installed module
 is read-only to the platform.
 
-An installed module directory is **self-contained for runtime use**. Everything the platform reads
-or loads from it, and everything those files import at run time, resolves inside it:
-
-- `package.json`, with no `workspace:` range needed at run time, and `ekklesia.module.json`;
-- every built artifact the manifest declares: `dist/server`, `dist/schema`, jobs, and the UI,
-  display, and contribution bundles;
-- the `drizzle/` migrations directory, with its journal and `_ekklesia.json`;
-- a `node_modules` holding the production dependencies of your server, schema, and jobs code,
-  including your own copies of `@ekklesia/module-sdk`, `@ekklesia/contracts`, and `drizzle-orm`.
+An installed module directory is **self-contained for runtime use**: everything the platform reads
+or loads from it, and everything those files import at run time, resolves inside it. You never
+assemble that directory by hand. You build your module, and the canonical packager turns it into an
+**Ekklesia Module Package v1**
+([ADR 0049](../architecture/decisions/0049-module-package-v1.md)): one deterministic archive and its
+SHA-256, which an installation verifies and extracts into module storage.
 
 **Copying `dist/` is not an installed module.** Your compiled server code imports
 `@ekklesia/module-sdk` and `drizzle-orm` by name, and Node resolves those only from your module's
 own directory upwards. The platform's `node_modules` is never on that path, and Ekklesia adds it
-through no link, `NODE_PATH`, loader hook, or alias. A module whose imports do not resolve stops the
-API from starting with a sanitized `MODULE_RUNTIME_IMPORT_FAILED`, so test the directory you ship,
-not your workspace.
+through no link, `NODE_PATH`, loader hook, or alias. The packager therefore bundles your backend.
 
-**Native dependencies** must match the platform image's runtime: Node.js 24.18.0 on Debian 13
-(glibc), on the image's CPU architecture.
+#### Packaging your module
+
+Build your module, then run the packager from the workspace your module is built in. It is a
+development dependency like `@ekklesia/module-ui-build`:
+
+```bash
+pnpm exec ekklesia-pack-module --module . --target any --out ../packages \
+  --source-revision "$(git rev-parse HEAD)"
+```
+
+It writes `<id>-<version>-any.tar.gz` and its `.sha256` line, and nothing else anywhere: it never
+installs, links, or deploys, so your workspace is left exactly as it was. Never run `pnpm deploy` in
+a workspace instead: it rewrites that workspace's install state to production-only.
+
+The archive holds one directory named with your module id:
+
+```text
+<id>/
+├── package.json            generated: name, version, private, "type": "module", the layer marker
+├── ekklesia.module.json    your manifest, byte for byte
+├── ekklesia.package.json   package metadata: target, runtime, provenance, file digests
+├── THIRD_PARTY_NOTICES     licence and notice text of every third-party package bundled
+├── dist/server/index.js    your backend entrypoints, bundled
+├── dist/schema/index.js
+├── dist/chunks/            code your backend entrypoints share
+├── dist/ui/ … dist/display/ … dist/contributions/   your browser artifacts, exactly as built
+└── drizzle/                your migrations
+```
+
+- **Bundled backend.** Your server, schema, and jobs entrypoints are bundled with every
+  pure-JavaScript dependency they use, the Module SDK, the contracts, and Drizzle included. The only
+  imports left are Node.js built-ins. A dependency the bundle cannot resolve fails packaging; nothing
+  is left to be found at run time.
+- **Never shipped:** `src/`, tests, TypeScript declarations, source maps, development dependencies,
+  your development `package.json`, any `workspace:` range, and links of any kind.
+- **Browser artifacts must be current.** The packager rebuilds them in memory and refuses an artifact
+  on disk that differs, so run your build first.
+- **`any` is the only target today.** A dependency that is native or platform-specific (a compiled
+  addon, a package that declares an operating system or CPU, or one that loads a per-platform binary
+  such as `sharp`) cannot be in an `any` package, and packaging fails. Native targets come later.
+- **Licences.** `THIRD_PARTY_NOTICES` credits every third-party package your bundles contain, with
+  its declared licence and the licence and notice files it ships. A package that declares no licence
+  fails packaging, and so does one that ships no licence text, unless its licence's standard text is
+  complete without a copyright line (Apache-2.0, which the packager then supplies and says so). The
+  Ekklesia platform's own packages are listed in `ekklesia.package.json` under `incorporates`.
+- **Deterministic.** The same packager version and the same built inputs produce the same archive,
+  byte for byte, wherever the checkout is.
 
 **Drizzle, for now.** You define tables with your own copy of Drizzle, and Core runs your queries
 through the platform's Drizzle instance (see [Database access](#database-access)). Objects from two
 copies interoperate only when the copies are interchangeable, so the current implementation requires
-**exactly the Drizzle version the platform uses**: the one `@ekklesia/module-sdk` depends on. This is
-a constraint of today's implementation, not a permanent contract.
+**exactly the Drizzle version the platform uses**: the one `@ekklesia/module-sdk` depends on. The
+package records it under `transitional`, and an installation refuses a package whose Drizzle differs.
+This is a constraint of today's implementation, not a permanent contract.
 
-Browser artifacts are already self-contained bundles, so nothing changes for them.
+#### Verifying a package
 
-The format modules are delivered in is proposed in
-[ADR 0049](../architecture/decisions/0049-module-package-v1.md): one deterministic archive per
-target, with bundled backend code, produced by an Ekklesia-owned packager that does not exist yet.
-Until it does, the repository's smoke test packages the module template with `pnpm deploy` in a
-disposable Docker build (`scripts/lib/test-module-package.Dockerfile`), a test fixture and not a
-package format. Never run `pnpm deploy` in your own workspace: it rewrites that workspace's install
-state to production-only, and the next build or `pnpm verify` then fails until a normal
-`pnpm install` repairs it.
+`node core/dist/cli/verify-module-package.js <archive> --sha256-file <archive>.sha256`, run from an
+Ekklesia installation (`/opt/ekklesia` in the image), checks a package against that platform without
+installing it. Pass `--extract-to <new directory>` to receive the verified module directory.
+[deploy/README.md](../../deploy/README.md#installed-modules) shows the whole installation.
 
 The repository's boundary checks (`pnpm boundaries`) prove only source modules in a workspace. An
 installed package normally has no source, so the platform cannot check it the same way. Your
diff --git a/package.json b/package.json
index 454aaea..ec96ffa 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,9 @@
     "migrations:validate": "turbo run build && node core/dist/cli/validate-migrations.js",
     "modules:disable": "turbo run build && node --env-file-if-exists=.env core/dist/cli/set-module-enabled.js --disable",
     "modules:enable": "turbo run build && node --env-file-if-exists=.env core/dist/cli/set-module-enabled.js --enable",
+    "modules:pack": "turbo run build && node packages/module-pack/bin/ekklesia-pack-module.mjs",
     "modules:validate": "turbo run build && node core/dist/cli/validate-modules.js",
+    "modules:verify-package": "turbo run build && node core/dist/cli/verify-module-package.js",
     "test": "turbo run test test:root",
     "test:migrations:integration": "pnpm build && bash scripts/test-migrations-integration.sh",
     "test:root": "vitest run --config vitest.config.ts",
diff --git a/packages/contracts/src/index.ts b/packages/contracts/src/index.ts
index 9de2a52..6bbe580 100644
--- a/packages/contracts/src/index.ts
+++ b/packages/contracts/src/index.ts
@@ -8,6 +8,7 @@ export * from "./module-http.js";
 export * from "./module-lifecycle.js";
 export * from "./module-manifest.js";
 export * from "./module-migration.js";
+export * from "./module-package.js";
 export * from "./module-realtime.js";
 export * from "./module-runtime.js";
 export * from "./module-schema.js";
diff --git a/packages/contracts/src/module-package.ts b/packages/contracts/src/module-package.ts
new file mode 100644
index 0000000..a0b8239
--- /dev/null
+++ b/packages/contracts/src/module-package.ts
@@ -0,0 +1,203 @@
+import { z } from "zod";
+import { moduleIdSchema } from "./identifiers.js";
+import { semanticVersionRangeSchema, semanticVersionSchema } from "./versions.js";
+
+/**
+ * Ekklesia Module Package v1 (ADR 0049): the format a separately versioned module is distributed
+ * in. One deterministic `.tar.gz` holding exactly one top-level directory named with the module id,
+ * whose contents are the installed module directory ADR 0048 requires. This file defines the
+ * package's metadata (`ekklesia.package.json`), its target names, and the runtime `package.json`
+ * the packager generates. The archive encoding itself belongs to the packager and the verifier.
+ */
+
+export const MODULE_PACKAGE_FORMAT = 1;
+export const MODULE_PACKAGE_METADATA_FILENAME = "ekklesia.package.json";
+export const MODULE_PACKAGE_NOTICES_FILENAME = "THIRD_PARTY_NOTICES";
+/** The portable target: a package with no native or platform-specific file. */
+export const MODULE_PACKAGE_ANY_TARGET = "any";
+
+/**
+ * `any`, or `<platform>-<arch>[-<libc>]` in Node.js's own `process.platform` and `process.arch`
+ * vocabulary. On Linux the C library is required, because a native addon built against one does
+ * not load against the other; elsewhere it is meaningless and refused.
+ */
+export const modulePackageTargetSchema = z.string().superRefine((value, context) => {
+  if (value === MODULE_PACKAGE_ANY_TARGET) {
+    return;
+  }
+  const match = /^([a-z][a-z0-9]*)-([a-z][a-z0-9]*)(?:-([a-z]+))?$/u.exec(value);
+  const platform = match?.[1];
+  const libc = match?.[3];
+  const valid =
+    match !== null &&
+    platform !== "any" &&
+    (platform === "linux" ? libc === "glibc" || libc === "musl" : libc === undefined);
+  if (!valid) {
+    context.addIssue({
+      code: "custom",
+      message: "Must be any, or <platform>-<arch>, with -glibc or -musl on Linux.",
+    });
+  }
+});
+
+/** A path inside the module directory: relative, POSIX, printable ASCII, and never escaping. ASCII
+ * keeps JavaScript's string order identical to the archive's byte-wise order. */
+const payloadPathSchema = z.string().superRefine((value, context) => {
+  const segments = value.split("/");
+  const valid =
+    /^[\x20-\x7e]+$/u.test(value) &&
+    !value.includes("\\") &&
+    !value.startsWith("/") &&
+    segments.every((segment) => segment !== "" && segment !== "." && segment !== "..") &&
+    value !== MODULE_PACKAGE_METADATA_FILENAME;
+  if (!valid) {
+    context.addIssue({
+      code: "custom",
+      message: "Must be a portable path inside the module directory, other than the metadata file.",
+    });
+  }
+});
+
+const modulePackageFileSchema = z.strictObject({
+  path: payloadPathSchema,
+  size: z.number().int().nonnegative(),
+  sha256: z.string().regex(/^[0-9a-f]{64}$/u, "Must be a lowercase hexadecimal SHA-256."),
+});
+
+const modulePackageRuntimeSchema = z.strictObject({
+  /** The Node.js versions the package was built for. Always present. */
+  node: semanticVersionRangeSchema,
+  /** Native packages only: the minimum Node-API version their addons need. */
+  nodeApi: z.number().int().positive().optional(),
+  /** Native packages only: the exact `process.versions.modules` an ABI-specific addon needs. */
+  nodeAbi: z
+    .string()
+    .regex(/^[0-9]+$/u)
+    .optional(),
+  /** Native Linux packages only: the minimum C library version. */
+  libcVersion: semanticVersionRangeSchema.optional(),
+});
+
+const ekklesiaPackageNameSchema = z
+  .string()
+  .regex(/^@ekklesia\/[a-z0-9][a-z0-9-]*$/u, "Must name an @ekklesia package.");
+
+/**
+ * Compatibility facts today's implementation needs and that are not part of the long-term contract
+ * (ADR 0049). Strict at every level: a reader that finds a fact it does not understand must refuse
+ * the package rather than ignore it.
+ *
+ * `databaseRuntime` records the Drizzle version bundled with the module's backend, because Core runs
+ * a module's queries through its own Drizzle instance over tables the module defined with its own
+ * copy. That is an implementation constraint pending a Module Database ABI decision, **not** a
+ * database contract a module may rely on.
+ */
+const modulePackageTransitionalSchema = z.strictObject({
+  databaseRuntime: z
+    .strictObject({
+      "drizzle-orm": semanticVersionSchema.optional(),
+    })
+    .optional(),
+});
+
+export const modulePackageMetadataSchema = z
+  .strictObject({
+    packageFormat: z.literal(MODULE_PACKAGE_FORMAT),
+    module: z.strictObject({ id: moduleIdSchema, version: semanticVersionSchema }),
+    target: modulePackageTargetSchema,
+    runtime: modulePackageRuntimeSchema,
+    provenance: z.strictObject({
+      /** The exact source revision the package was built from: a full SHA-1 or SHA-256 commit id. */
+      revision: z.string().regex(/^(?:[0-9a-f]{40}|[0-9a-f]{64})$/u),
+      /** Informational only: nothing trusts it, and it ties the package to no host. */
+      repository: z.string().min(1).max(2048).optional(),
+      packager: z.strictObject({
+        name: z.string().min(1).max(214),
+        version: semanticVersionSchema,
+      }),
+    }),
+    /** The exact versions of the Ekklesia SDK and runtime libraries bundled into the package. */
+    incorporates: z.record(ekklesiaPackageNameSchema, semanticVersionSchema),
+    transitional: modulePackageTransitionalSchema.optional(),
+    /** Every regular file in the module directory except this metadata file, in byte-wise path
+     * order. The set is exact: nothing missing, nothing extra. */
+    files: z.array(modulePackageFileSchema),
+  })
+  .superRefine((metadata, context) => {
+    if (
+      metadata.target === MODULE_PACKAGE_ANY_TARGET &&
+      (metadata.runtime.nodeApi !== undefined ||
+        metadata.runtime.nodeAbi !== undefined ||
+        metadata.runtime.libcVersion !== undefined)
+    ) {
+      context.addIssue({
+        code: "custom",
+        message: "An any-target package carries no native runtime requirement.",
+        path: ["runtime"],
+      });
+    }
+    for (let index = 1; index < metadata.files.length; index += 1) {
+      const previous = metadata.files[index - 1]?.path ?? "";
+      const current = metadata.files[index]?.path ?? "";
+      if (!(previous < current)) {
+        context.addIssue({
+          code: "custom",
+          message: "Files must be listed once each, in byte-wise path order.",
+          path: ["files", index, "path"],
+        });
+      }
+    }
+  });
+
+export type ModulePackageMetadata = z.output<typeof modulePackageMetadataSchema>;
+export type ModulePackageFile = z.output<typeof modulePackageFileSchema>;
+export type ModulePackageTarget = z.output<typeof modulePackageTargetSchema>;
+
+export function safeParseModulePackageMetadata(input: unknown) {
+  return modulePackageMetadataSchema.safeParse(input);
+}
+
+export function safeParseModulePackageTarget(input: unknown) {
+  return modulePackageTargetSchema.safeParse(input);
+}
+
+/**
+ * The runtime `package.json` of an installed module: exactly what module discovery reads, generated
+ * by the packager and never copied from a development workspace. No dependencies, scripts, exports,
+ * or imports, because nothing at run time resolves through them.
+ */
+export const modulePackageRuntimePackageSchema = z.strictObject({
+  name: z.string().min(1).max(214),
+  version: semanticVersionSchema,
+  private: z.literal(true),
+  type: z.literal("module"),
+  ekklesia: z.strictObject({ layer: z.literal("module") }),
+});
+
+export type ModulePackageRuntimePackage = z.output<typeof modulePackageRuntimePackageSchema>;
+
+export function modulePackageRuntimePackage(identity: {
+  readonly name: string;
+  readonly version: string;
+}): ModulePackageRuntimePackage {
+  return {
+    name: identity.name,
+    version: identity.version,
+    private: true,
+    type: "module",
+    ekklesia: { layer: "module" },
+  };
+}
+
+export function safeParseModulePackageRuntimePackage(input: unknown) {
+  return modulePackageRuntimePackageSchema.safeParse(input);
+}
+
+/** The recommended archive file name. A convenience only: a file name is never trusted. */
+export function modulePackageArchiveFileName(
+  moduleId: string,
+  version: string,
+  target: string,
+): string {
+  return `${moduleId}-${version}-${target}.tar.gz`;
+}
diff --git a/packages/contracts/tests/module-package.test.ts b/packages/contracts/tests/module-package.test.ts
new file mode 100644
index 0000000..9592a18
--- /dev/null
+++ b/packages/contracts/tests/module-package.test.ts
@@ -0,0 +1,167 @@
+import { describe, expect, it } from "vitest";
+import {
+  MODULE_PACKAGE_FORMAT,
+  MODULE_PACKAGE_METADATA_FILENAME,
+  modulePackageArchiveFileName,
+  modulePackageRuntimePackage,
+  safeParseModulePackageMetadata,
+  safeParseModulePackageRuntimePackage,
+  safeParseModulePackageTarget,
+} from "../src/index.js";
+
+const digest = "a".repeat(64);
+
+function metadata(overrides: Record<string, unknown> = {}): Record<string, unknown> {
+  return {
+    packageFormat: 1,
+    module: { id: "example", version: "0.1.0" },
+    target: "any",
+    runtime: { node: ">=24.11.0 <25" },
+    provenance: {
+      revision: "86ae907f59458508e3277666cdd214f5bd7c1078",
+      packager: { name: "@ekklesia/module-pack", version: "0.1.2" },
+    },
+    incorporates: { "@ekklesia/contracts": "0.1.2", "@ekklesia/module-sdk": "0.1.2" },
+    transitional: { databaseRuntime: { "drizzle-orm": "0.45.2" } },
+    files: [
+      { path: "THIRD_PARTY_NOTICES", size: 10, sha256: digest },
+      { path: "dist/server/index.js", size: 20, sha256: digest },
+      { path: "ekklesia.module.json", size: 30, sha256: digest },
+      { path: "package.json", size: 40, sha256: digest },
+    ],
+    ...overrides,
+  };
+}
+
+describe("Ekklesia Module Package v1 metadata (ADR 0049)", () => {
+  it("names the format, its metadata file, and the recommended archive file name", () => {
+    expect(MODULE_PACKAGE_FORMAT).toBe(1);
+    expect(MODULE_PACKAGE_METADATA_FILENAME).toBe("ekklesia.package.json");
+    expect(modulePackageArchiveFileName("example", "0.1.0", "any")).toBe(
+      "example-0.1.0-any.tar.gz",
+    );
+  });
+
+  it("accepts a complete any-target package description", () => {
+    expect(safeParseModulePackageMetadata(metadata()).success).toBe(true);
+  });
+
+  it("accepts a package that incorporates nothing and needs no transitional facts", () => {
+    const { transitional: _transitional, ...rest } = metadata();
+    expect(safeParseModulePackageMetadata({ ...rest, incorporates: {} }).success).toBe(true);
+  });
+
+  it.each([
+    ["an unknown top-level field", { signature: "x" }],
+    ["format 2", { packageFormat: 2 }],
+    ["a missing source revision", { provenance: { packager: { name: "p", version: "1.0.0" } } }],
+    [
+      "an abbreviated revision",
+      { provenance: { revision: "86ae907", packager: { name: "p", version: "1.0.0" } } },
+    ],
+    ["a non-semver module version", { module: { id: "example", version: "1.0" } }],
+    ["an invalid module id", { module: { id: "Example", version: "0.1.0" } }],
+    ["an invalid Node range", { runtime: { node: "soon" } }],
+    ["native runtime facts on an any target", { runtime: { node: ">=24", nodeApi: 9 } }],
+    ["a non-Ekklesia incorporated package", { incorporates: { zod: "4.4.3" } }],
+    [
+      "an incorporated range instead of a version",
+      { incorporates: { "@ekklesia/module-sdk": "^0.1.0" } },
+    ],
+    ["an unknown transitional key", { transitional: { orm: {} } }],
+    ["an unknown database runtime", { transitional: { databaseRuntime: { prisma: "6.0.0" } } }],
+  ])("rejects %s", (_label, overrides) => {
+    expect(safeParseModulePackageMetadata(metadata(overrides)).success).toBe(false);
+  });
+
+  it.each([
+    ["an absolute path", "/etc/passwd"],
+    ["a parent segment", "dist/../../secret"],
+    ["a dot segment", "./package.json"],
+    ["an empty segment", "dist//index.js"],
+    ["a backslash", "dist\\index.js"],
+    ["a NUL byte", "dist/\u0000"],
+    ["the metadata file itself", "ekklesia.package.json"],
+  ])("rejects a file entry with %s", (_label, path) => {
+    const files = [{ path, size: 1, sha256: digest }];
+    expect(safeParseModulePackageMetadata(metadata({ files })).success).toBe(false);
+  });
+
+  it("requires file entries in byte-wise path order, without duplicates", () => {
+    const entry = (path: string) => ({ path, size: 1, sha256: digest });
+    expect(
+      safeParseModulePackageMetadata(metadata({ files: [entry("b"), entry("a")] })).success,
+    ).toBe(false);
+    expect(
+      safeParseModulePackageMetadata(metadata({ files: [entry("a"), entry("a")] })).success,
+    ).toBe(false);
+    // Byte-wise, not locale order: upper case sorts before lower case.
+    expect(
+      safeParseModulePackageMetadata(metadata({ files: [entry("THIRD"), entry("dist")] })).success,
+    ).toBe(true);
+  });
+
+  it.each([
+    ["an uppercase digest", { sha256: "A".repeat(64) }],
+    ["a short digest", { sha256: "a".repeat(63) }],
+    ["a negative size", { size: -1 }],
+    ["a fractional size", { size: 1.5 }],
+  ])("rejects a file entry with %s", (_label, override) => {
+    const files = [{ path: "package.json", size: 1, sha256: digest, ...override }];
+    expect(safeParseModulePackageMetadata(metadata({ files })).success).toBe(false);
+  });
+});
+
+describe("module package targets", () => {
+  it.each([
+    "any",
+    "linux-x64-glibc",
+    "linux-arm64-glibc",
+    "linux-x64-musl",
+    "darwin-arm64",
+  ])("accepts %s", (target) => {
+    expect(safeParseModulePackageTarget(target).success).toBe(true);
+  });
+
+  it.each([
+    "",
+    "ANY",
+    "linux-x64",
+    "linux-x64-gnu",
+    "darwin-arm64-glibc",
+    "linux",
+    "any-x64",
+  ])("rejects %j", (target) => {
+    expect(safeParseModulePackageTarget(target).success).toBe(false);
+  });
+});
+
+describe("the generated runtime package.json", () => {
+  it("holds exactly what module discovery reads", () => {
+    expect(
+      modulePackageRuntimePackage({ name: "@ekklesia/module-template", version: "0.1.0" }),
+    ).toEqual({
+      name: "@ekklesia/module-template",
+      version: "0.1.0",
+      private: true,
+      type: "module",
+      ekklesia: { layer: "module" },
+    });
+  });
+
+  it("accepts the generated shape and nothing more", () => {
+    const generated = modulePackageRuntimePackage({ name: "@scope/example", version: "1.2.3" });
+    expect(safeParseModulePackageRuntimePackage(generated).success).toBe(true);
+    for (const extra of [
+      { dependencies: { "@ekklesia/module-sdk": "workspace:*" } },
+      { scripts: { build: "tsc" } },
+      { exports: { ".": "./dist/server/index.js" } },
+      { imports: { "#x": "./x.js" } },
+    ]) {
+      expect(safeParseModulePackageRuntimePackage({ ...generated, ...extra }).success).toBe(false);
+    }
+    expect(safeParseModulePackageRuntimePackage({ ...generated, type: "commonjs" }).success).toBe(
+      false,
+    );
+  });
+});
diff --git a/packages/module-pack/bin/ekklesia-pack-module.mjs b/packages/module-pack/bin/ekklesia-pack-module.mjs
new file mode 100755
index 0000000..51766eb
--- /dev/null
+++ b/packages/module-pack/bin/ekklesia-pack-module.mjs
@@ -0,0 +1,25 @@
+#!/usr/bin/env node
+// Committed launcher, deliberately not generated.
+//
+// pnpm creates `.bin` links during `pnpm install`, which runs before Turborepo builds anything. A
+// `bin` pointing straight at `dist/cli.js` therefore fails to link on a fresh clone — the compiled
+// file does not exist yet — and the packager would not link in CI. This file always exists,
+// so the link always succeeds; it defers to the compiled CLI at run time, by which point
+// `dependsOn: ["^build"]` has produced it.
+import { fileURLToPath } from "node:url";
+
+const compiledCli = new URL("../dist/cli.js", import.meta.url);
+
+try {
+  await import(compiledCli.href);
+} catch (error) {
+  if (error?.code === "ERR_MODULE_NOT_FOUND") {
+    process.stderr.write(
+      `@ekklesia/module-pack is not built yet (${fileURLToPath(compiledCli)}).\n` +
+        "Run `pnpm build` from the repository root first.\n",
+    );
+    process.exitCode = 1;
+  } else {
+    throw error;
+  }
+}
diff --git a/packages/module-pack/licenses/Apache-2.0.txt b/packages/module-pack/licenses/Apache-2.0.txt
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/packages/module-pack/licenses/Apache-2.0.txt
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
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+
+      "You" (or "Your") shall mean an individual or Legal Entity
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
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+      communication on electronic mailing lists, source code control systems,
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+      designated in writing by the copyright owner as "Not a Contribution."
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
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+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
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+      (except as stated in this section) patent license to make, have made,
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+      Contribution(s) alone or by combination of their Contribution(s)
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+      institute patent litigation against any entity (including a
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+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
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+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
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+      meet the following conditions:
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+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
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+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
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+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
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+      (d) If the Work includes a "NOTICE" text file as part of its
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+          of the following places: within a NOTICE text file distributed
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+          of the NOTICE file are for informational purposes only and
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+          notices within Derivative Works that You distribute, alongside
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+          that such additional attribution notices cannot be construed
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
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+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
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+      PARTICULAR PURPOSE. You are solely responsible for determining the
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+      risks associated with Your exercise of permissions under this License.
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
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+      Work (including but not limited to damages for loss of goodwill,
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+      on Your own behalf and on Your sole responsibility, not on behalf
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+
+      To apply the Apache License to your work, attach the following
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+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
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diff --git a/packages/module-pack/package.json b/packages/module-pack/package.json
new file mode 100644
index 0000000..cbf3912
--- /dev/null
+++ b/packages/module-pack/package.json
@@ -0,0 +1,46 @@
+{
+  "name": "@ekklesia/module-pack",
+  "version": "0.1.2",
+  "type": "module",
+  "files": [
+    "bin",
+    "dist",
+    "licenses"
+  ],
+  "bin": {
+    "ekklesia-pack-module": "./bin/ekklesia-pack-module.mjs"
+  },
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc --project tsconfig.build.json",
+    "lint": "biome lint .",
+    "prepack": "pnpm --workspace-root exec turbo run build --filter=@ekklesia/module-pack",
+    "test": "vitest run",
+    "typecheck": "tsc --noEmit --project tsconfig.json"
+  },
+  "dependencies": {
+    "@ekklesia/contracts": "workspace:*",
+    "@ekklesia/module-ui-build": "workspace:*",
+    "esbuild": "0.28.1",
+    "semver": "7.8.5"
+  },
+  "devDependencies": {
+    "@biomejs/biome": "2.5.3",
+    "@ekklesia/core": "workspace:*",
+    "@ekklesia/module-sdk": "workspace:*",
+    "@ekklesia/module-template": "workspace:*",
+    "@types/node": "24.13.3",
+    "@types/semver": "7.7.1",
+    "drizzle-orm": "0.45.2",
+    "typescript": "7.0.2",
+    "vitest": "4.1.10"
+  },
+  "ekklesia": {
+    "layer": "tooling"
+  }
+}
diff --git a/packages/module-pack/src/cli.ts b/packages/module-pack/src/cli.ts
new file mode 100644
index 0000000..0cecf62
--- /dev/null
+++ b/packages/module-pack/src/cli.ts
@@ -0,0 +1,102 @@
+#!/usr/bin/env node
+import path from "node:path";
+import process from "node:process";
+import { pathToFileURL } from "node:url";
+import { formatMessages } from "esbuild";
+import { ModulePackError, type PackModuleOptions, packModule } from "./pack-module.js";
+
+/**
+ * `ekklesia-pack-module` — the canonical Ekklesia module packager (ADR 0049).
+ *
+ *   ekklesia-pack-module --module <built module directory> --target any --out <directory>
+ *     --source-revision <full commit id> [--repository <url>]
+ *
+ * Writes `<id>-<version>-any.tar.gz` and its `.sha256` line to the output directory, and nothing
+ * else anywhere. Run it in the module's CI after building the module.
+ */
+
+class PackArgumentsError extends Error {}
+
+const USAGE =
+  "Usage: ekklesia-pack-module --module <directory> --target any --out <directory> --source-revision <commit> [--repository <url>]";
+
+const OPTIONS: Readonly<Record<string, keyof PackModuleOptions>> = Object.freeze({
+  "--module": "moduleDirectory",
+  "--out": "outDirectory",
+  "--repository": "repository",
+  "--source-revision": "sourceRevision",
+  "--target": "target",
+});
+
+export function parsePackModuleArguments(argv: readonly string[]): PackModuleOptions {
+  const values = new Map<keyof PackModuleOptions, string>();
+  for (let index = 0; index < argv.length; index += 2) {
+    const option = OPTIONS[argv[index] ?? ""];
+    const value = argv[index + 1];
+    if (
+      option === undefined ||
+      value === undefined ||
+      value.startsWith("--") ||
+      values.has(option)
+    ) {
+      throw new PackArgumentsError(USAGE);
+    }
+    values.set(option, value);
+  }
+  const required = ["moduleDirectory", "outDirectory", "sourceRevision", "target"] as const;
+  if (required.some((option) => !values.has(option))) {
+    throw new PackArgumentsError(USAGE);
+  }
+  const repository = values.get("repository");
+  return {
+    moduleDirectory: values.get("moduleDirectory") ?? "",
+    outDirectory: values.get("outDirectory") ?? "",
+    ...(repository === undefined ? {} : { repository }),
+    sourceRevision: values.get("sourceRevision") ?? "",
+    target: values.get("target") ?? "",
+  };
+}
+
+async function main(): Promise<number> {
+  try {
+    const result = await packModule(parsePackModuleArguments(process.argv.slice(2)));
+    process.stdout.write(
+      `Packed ${result.moduleId}@${result.version} (target ${result.target}): ${path.basename(result.archivePath)}, ${result.archiveBytes} bytes, ${result.fileCount} files\n`,
+    );
+    process.stdout.write(`sha256 ${result.sha256}\n`);
+    return 0;
+  } catch (error) {
+    if (error instanceof PackArgumentsError) {
+      process.stderr.write(`${error.message}\n`);
+      return 64;
+    }
+    if (error instanceof ModulePackError) {
+      process.stderr.write(`[${error.code}] ${error.message}\n`);
+      if (error.diagnostics.length > 0) {
+        const formatted = await formatMessages([...error.diagnostics], {
+          color: false,
+          kind: "error",
+        });
+        process.stderr.write(formatted.join(""));
+      }
+      return 1;
+    }
+    process.stderr.write("Module packaging failed unexpectedly.\n");
+    return 1;
+  }
+}
+
+function isDirectExecution(): boolean {
+  const entrypoint = process.argv[1];
+  // Run through the committed launcher, which imports this file, or directly.
+  return (
+    entrypoint !== undefined &&
+    (import.meta.url === pathToFileURL(path.resolve(entrypoint)).href ||
+      path.basename(entrypoint) === "ekklesia-pack-module.mjs" ||
+      path.basename(entrypoint) === "ekklesia-pack-module")
+  );
+}
+
+if (isDirectExecution()) {
+  process.exitCode = await main();
+}
diff --git a/packages/module-pack/src/index.ts b/packages/module-pack/src/index.ts
new file mode 100644
index 0000000..51f4e59
--- /dev/null
+++ b/packages/module-pack/src/index.ts
@@ -0,0 +1 @@
+export * from "./pack-module.js";
diff --git a/packages/module-pack/src/notices.ts b/packages/module-pack/src/notices.ts
new file mode 100644
index 0000000..6c081bd
--- /dev/null
+++ b/packages/module-pack/src/notices.ts
@@ -0,0 +1,176 @@
+import { readdir, readFile } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import type { BundledPackage } from "./packages.js";
+
+/**
+ * `THIRD_PARTY_NOTICES` (ADR 0049): the licence and notice text that redistributing a module
+ * package requires, generated from what was actually bundled.
+ *
+ * - **Discovery.** Every source file in every bundle (the backend, and each browser artifact) is
+ *   traced to the package it belongs to. Packages installed under `node_modules` are third-party
+ *   software and are credited here. The Ekklesia platform's own packages, and the module itself,
+ *   are not third-party software: the platform packages appear in `ekklesia.package.json` under
+ *   `incorporates`.
+ * - **Content.** For each third-party package: its name, version, declared licence, where in the
+ *   package it is used, and the complete text of every licence, copying, copyright, and notice file
+ *   it ships at its root, plus the file a `SEE LICENSE IN` declaration names.
+ * - **Duplicates.** A package bundled into several artifacts is credited once, listing every
+ *   artifact kind it is used in. Different packages are never merged, even when their texts match,
+ *   so each component keeps its own notice.
+ * - **Gaps fail.** A package that declares no licence, or whose licence cannot be established,
+ *   stops packaging. When a package ships no licence file, the standard text of its declared licence
+ *   is supplied only if that licence's standard text is complete without project-specific lines
+ *   (Apache-2.0). An MIT, ISC, or BSD package without its file is refused, because its copyright line
+ *   exists only in that file.
+ *
+ * Everything is sorted, and line endings are normalized, so the file is byte-identical for identical
+ * inputs.
+ */
+
+export type NoticeErrorCode = "MODULE_PACK_LICENCE_TEXT_MISSING" | "MODULE_PACK_LICENCE_UNKNOWN";
+
+export class NoticeError extends Error {
+  readonly code: NoticeErrorCode;
+  readonly component: string;
+
+  constructor(code: NoticeErrorCode, component: string) {
+    super(code);
+    this.name = "NoticeError";
+    this.code = code;
+    this.component = component;
+  }
+}
+
+export type NoticeUse = "backend" | "browser";
+
+export interface NoticeComponent {
+  readonly bundled: BundledPackage;
+  readonly uses: ReadonlySet<NoticeUse>;
+}
+
+/** Licences whose standard text is complete without any project-specific line, so supplying it
+ * for a package that ships none is faithful. Checked into this package (`licenses/`). */
+const STANDARD_TEXTS: Readonly<Record<string, string>> = Object.freeze({
+  "Apache-2.0": "Apache-2.0.txt",
+});
+
+const LICENCE_FILE =
+  /^(?:licen[cs]e(?:[-._][a-z0-9.-]+)?|copying(?:[-._][a-z0-9.-]+)?|notice(?:[-._][a-z0-9.-]+)?|copyright(?:[-._][a-z0-9.-]+)?)$/iu;
+
+const RULE = "-".repeat(80);
+
+function licenceOf(bundled: BundledPackage): string | undefined {
+  const declared = bundled.manifest.license;
+  if (typeof declared === "string" && declared.trim() !== "") {
+    return declared.trim();
+  }
+  if (typeof declared === "object" && declared !== null && "type" in declared) {
+    const type = (declared as { type?: unknown }).type;
+    return typeof type === "string" && type.trim() !== "" ? type.trim() : undefined;
+  }
+  return undefined;
+}
+
+function normalized(text: string): string {
+  return `${text.replaceAll("\r\n", "\n").replaceAll("\r", "\n").replace(/\s+$/u, "")}\n`;
+}
+
+function compare(left: string, right: string): number {
+  return left < right ? -1 : left > right ? 1 : 0;
+}
+
+async function licenceTexts(
+  bundled: BundledPackage,
+  licence: string,
+): Promise<readonly { readonly title: string; readonly text: string }[]> {
+  const names = (await readdir(bundled.root, { withFileTypes: true }))
+    .filter((entry) => entry.isFile() && LICENCE_FILE.test(entry.name))
+    .map((entry) => entry.name)
+    .sort(compare);
+  const seeFile = /^SEE LICEN[CS]E IN (.+)$/iu.exec(licence)?.[1]?.trim();
+  if (seeFile && !names.includes(seeFile)) {
+    const resolved = path.resolve(bundled.root, seeFile);
+    if (resolved.startsWith(`${bundled.root}${path.sep}`)) {
+      names.push(seeFile);
+    }
+  }
+  const texts: { title: string; text: string }[] = [];
+  for (const name of names) {
+    texts.push({
+      text: normalized(await readFile(path.join(bundled.root, name), "utf8")),
+      title: name,
+    });
+  }
+  return texts;
+}
+
+const packageRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+
+async function standardText(licence: string): Promise<string | undefined> {
+  const file = STANDARD_TEXTS[licence];
+  return file === undefined
+    ? undefined
+    : normalized(await readFile(path.join(packageRoot, "licenses", file), "utf8"));
+}
+
+export async function thirdPartyNotices(
+  components: ReadonlyMap<string, NoticeComponent>,
+): Promise<string> {
+  const ordered = [...components.values()].sort(
+    (left, right) =>
+      compare(left.bundled.name, right.bundled.name) ||
+      compare(left.bundled.version, right.bundled.version),
+  );
+  const sections: string[] = [];
+  for (const { bundled, uses } of ordered) {
+    const component = `${bundled.name}@${bundled.version}`;
+    const licence = licenceOf(bundled);
+    if (licence === undefined || /^UNLICEN[CS]ED$/iu.test(licence)) {
+      throw new NoticeError("MODULE_PACK_LICENCE_UNKNOWN", component);
+    }
+    let texts = await licenceTexts(bundled, licence);
+    // A NOTICE file alone is not the licence: the licence text must still come from somewhere.
+    if (!texts.some((text) => !/^notice/iu.test(text.title))) {
+      const standard = await standardText(licence);
+      if (standard === undefined) {
+        throw new NoticeError("MODULE_PACK_LICENCE_TEXT_MISSING", component);
+      }
+      texts = [
+        ...texts,
+        {
+          text: `The package ships no licence file. This is the standard text of the licence it declares (${licence}).\n\n${standard}`,
+          title: `Standard ${licence} text`,
+        },
+      ];
+    }
+    sections.push(
+      [
+        RULE,
+        `${bundled.name} ${bundled.version}`,
+        `License: ${licence}`,
+        `Used in: ${[...uses].sort(compare).join(", ")}`,
+        RULE,
+        "",
+        ...texts.flatMap((text) => [`[${text.title}]`, "", text.text]),
+      ].join("\n"),
+    );
+  }
+
+  const header = [
+    "THIRD-PARTY SOFTWARE NOTICES",
+    "",
+    "This module package includes the third-party software listed below. Each entry names the",
+    "component, its version, its declared licence, where in the package it is used, and the licence",
+    "and notice text that came with it.",
+    "",
+    "The Ekklesia platform's own packages are not third-party software. They are listed in",
+    'ekklesia.package.json under "incorporates".',
+    "",
+    ordered.length === 0
+      ? "This module package includes no third-party software."
+      : `${ordered.length} ${ordered.length === 1 ? "component" : "components"}.`,
+    "",
+  ].join("\n");
+  return `${[header, ...sections].join("\n").replace(/\n+$/u, "")}\n`;
+}
diff --git a/packages/module-pack/src/pack-module.ts b/packages/module-pack/src/pack-module.ts
new file mode 100644
index 0000000..76b26c4
--- /dev/null
+++ b/packages/module-pack/src/pack-module.ts
@@ -0,0 +1,588 @@
+import { createHash } from "node:crypto";
+import { lstat, mkdir, readdir, readFile, realpath, rename, writeFile } from "node:fs/promises";
+import { isBuiltin } from "node:module";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import {
+  MODULE_PACKAGE_ANY_TARGET,
+  MODULE_PACKAGE_FORMAT,
+  MODULE_PACKAGE_METADATA_FILENAME,
+  MODULE_PACKAGE_NOTICES_FILENAME,
+  type ModuleManifest,
+  modulePackageArchiveFileName,
+  modulePackageRuntimePackage,
+  safeParseModuleManifest,
+  safeParseModulePackageMetadata,
+} from "@ekklesia/contracts";
+import { analyzeModuleUi, ModuleUiBuildError } from "@ekklesia/module-ui-build";
+import { build, type Message, type Plugin } from "esbuild";
+import { minVersion, satisfies, validRange } from "semver";
+import { NoticeError, type NoticeComponent, type NoticeUse, thirdPartyNotices } from "./notices.js";
+import { BundledPackageIndex, isNativeOrPlatformSpecific } from "./packages.js";
+import { deterministicTarGz, TarPathError } from "./tar.js";
+
+/**
+ * The canonical Ekklesia module packager (ADR 0049): turns a built module directory into one
+ * deterministic Module Package v1 archive and its `.sha256` line.
+ *
+ * It reads the module directory and the dependencies its workspace installed, and writes only the
+ * two output files. It never installs, links, or deploys anything, so the workspace it runs in is
+ * left exactly as it was. In this release it produces the portable `any` target only.
+ */
+
+export type ModulePackErrorCode =
+  | "MODULE_PACK_BUNDLE_FAILED"
+  | "MODULE_PACK_DATABASE_RUNTIME_CONFLICT"
+  | "MODULE_PACK_ENTRYPOINT_MISSING"
+  | "MODULE_PACK_ENTRYPOINT_UNSUPPORTED"
+  | "MODULE_PACK_EXTERNAL_DEPENDENCY"
+  | "MODULE_PACK_FORBIDDEN_FILE"
+  | "MODULE_PACK_IDENTITY_MISMATCH"
+  | "MODULE_PACK_INCORPORATED_CONFLICT"
+  | "MODULE_PACK_LAYOUT_CONFLICT"
+  | "MODULE_PACK_LICENCE_TEXT_MISSING"
+  | "MODULE_PACK_LICENCE_UNKNOWN"
+  | "MODULE_PACK_MANIFEST_INVALID"
+  | "MODULE_PACK_METADATA_INVALID"
+  | "MODULE_PACK_MIGRATIONS_INVALID"
+  | "MODULE_PACK_NATIVE_DEPENDENCY"
+  | "MODULE_PACK_OUTPUT_FAILED"
+  | "MODULE_PACK_PATH_UNSUPPORTED"
+  | "MODULE_PACK_REVISION_INVALID"
+  | "MODULE_PACK_RUNTIME_UNKNOWN"
+  | "MODULE_PACK_SDK_INCOMPATIBLE"
+  | "MODULE_PACK_TARGET_UNSUPPORTED"
+  | "MODULE_PACK_UI_STALE";
+
+const messages: Readonly<Record<ModulePackErrorCode, string>> = Object.freeze({
+  MODULE_PACK_BUNDLE_FAILED:
+    "The backend could not be bundled into self-contained files. Every import must resolve and bundle cleanly.",
+  MODULE_PACK_DATABASE_RUNTIME_CONFLICT: "The backend bundles more than one Drizzle version.",
+  MODULE_PACK_ENTRYPOINT_MISSING:
+    "A declared backend entrypoint does not exist. Build the module before packaging it.",
+  MODULE_PACK_ENTRYPOINT_UNSUPPORTED:
+    "Backend entrypoints must be compiled .js files to be bundled into a Module Package v1.",
+  MODULE_PACK_EXTERNAL_DEPENDENCY:
+    "The backend bundle would import a dependency at run time; an any-target package bundles everything.",
+  MODULE_PACK_FORBIDDEN_FILE:
+    "The package would contain a source, test, declaration, source-map, or dependency file.",
+  MODULE_PACK_IDENTITY_MISMATCH:
+    "package.json must declare a name and the same version as ekklesia.module.json.",
+  MODULE_PACK_INCORPORATED_CONFLICT:
+    "The package bundles more than one version of an Ekklesia package.",
+  MODULE_PACK_LAYOUT_CONFLICT: "Two package files would have the same path.",
+  MODULE_PACK_LICENCE_TEXT_MISSING:
+    "A bundled package ships no licence text, and its licence has no complete standard text to supply.",
+  MODULE_PACK_LICENCE_UNKNOWN: "A bundled package declares no licence that permits redistribution.",
+  MODULE_PACK_MANIFEST_INVALID: "ekklesia.module.json is missing or invalid.",
+  MODULE_PACK_METADATA_INVALID: "The generated package metadata failed its own contract.",
+  MODULE_PACK_MIGRATIONS_INVALID:
+    "The migrations directory must hold only regular files and directories.",
+  MODULE_PACK_NATIVE_DEPENDENCY:
+    "The backend bundles a native or platform-specific dependency, which an any-target package cannot contain.",
+  MODULE_PACK_OUTPUT_FAILED: "The package could not be written to the output directory.",
+  MODULE_PACK_PATH_UNSUPPORTED:
+    "A package path is not portable printable ASCII that fits the archive format.",
+  MODULE_PACK_REVISION_INVALID: "The source revision must be a full 40- or 64-character commit id.",
+  MODULE_PACK_RUNTIME_UNKNOWN:
+    "The Node.js range could not be determined. Run inside an Ekklesia workspace, or pass one.",
+  MODULE_PACK_SDK_INCOMPATIBLE:
+    "The bundled Module SDK is outside the manifest's own compatibility.moduleSdk range.",
+  MODULE_PACK_TARGET_UNSUPPORTED: "This packager produces the any target only.",
+  MODULE_PACK_UI_STALE:
+    "A declared browser artifact is missing or out of date. Build the module before packaging it.",
+});
+
+export class ModulePackError extends Error {
+  readonly code: ModulePackErrorCode;
+  /** The package or path the failure concerns, when there is one. A module author's own build
+   * input, never a secret. */
+  readonly detail?: string;
+  /** esbuild's structured diagnostics, for a command line to print. */
+  readonly diagnostics: readonly Message[];
+
+  constructor(code: ModulePackErrorCode, detail?: string, diagnostics: readonly Message[] = []) {
+    super(detail === undefined ? messages[code] : `${messages[code]} (${detail})`);
+    this.name = "ModulePackError";
+    this.code = code;
+    if (detail !== undefined) {
+      this.detail = detail;
+    }
+    this.diagnostics = diagnostics;
+  }
+}
+
+export interface PackModuleOptions {
+  /** A built module directory: its manifest, package.json, and compiled entrypoints. */
+  readonly moduleDirectory: string;
+  /** `any` only, in this release. */
+  readonly target: string;
+  readonly outDirectory: string;
+  /** The full commit id the module was built from. */
+  readonly sourceRevision: string;
+  /** Informational only; recorded as given. */
+  readonly repository?: string;
+  /** The Node.js range the package is built for. Defaults to the enclosing workspace's
+   * `engines.node`, the toolchain the module was built and tested with. */
+  readonly nodeRange?: string;
+}
+
+export interface ModulePackResult {
+  readonly archivePath: string;
+  readonly sha256Path: string;
+  readonly sha256: string;
+  readonly archiveBytes: number;
+  readonly moduleId: string;
+  readonly version: string;
+  readonly target: string;
+  /** Payload files, the metadata file not included. */
+  readonly fileCount: number;
+}
+
+const NATIVE_GUARD = "ekklesia-native-addon-guard";
+
+/** Refuses a compiled addon the moment the bundle reaches one. */
+const nativeAddonGuard: Plugin = {
+  name: NATIVE_GUARD,
+  setup(pluginBuild) {
+    pluginBuild.onLoad({ filter: /\.node$/i }, () => ({
+      errors: [{ text: "A compiled Node.js addon cannot be bundled into an any-target package." }],
+    }));
+  },
+};
+
+/** Bundled CommonJS code that requires a Node built-in needs a `require` in module scope. Nothing
+ * else can be required at run time: every other dependency is inside the bundle, and the packager
+ * refuses a bundle that would import anything but a built-in. */
+const REQUIRE_BANNER =
+  'import { createRequire as __ekklesiaCreateRequire } from "node:module";\nconst require = __ekklesiaCreateRequire(import.meta.url);';
+
+function compare(left: string, right: string): number {
+  return left < right ? -1 : left > right ? 1 : 0;
+}
+
+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);
+}
+
+async function readJson(file: string): Promise<unknown> {
+  return JSON.parse(await readFile(file, "utf8")) as unknown;
+}
+
+const ownManifestPath = path.resolve(
+  path.dirname(fileURLToPath(import.meta.url)),
+  "..",
+  "package.json",
+);
+
+async function packagerIdentity(): Promise<{ readonly name: string; readonly version: string }> {
+  const manifest = (await readJson(ownManifestPath)) as Record<string, unknown>;
+  return { name: String(manifest.name), version: String(manifest.version) };
+}
+
+async function workspaceNodeRange(moduleDirectory: string): Promise<string> {
+  let directory = moduleDirectory;
+  for (;;) {
+    try {
+      await lstat(path.join(directory, "pnpm-workspace.yaml"));
+      const manifest = await readJson(path.join(directory, "package.json"));
+      const engines = isRecord(manifest) ? manifest.engines : undefined;
+      const range = isRecord(engines) ? engines.node : undefined;
+      if (typeof range === "string") {
+        return range;
+      }
+      break;
+    } catch {
+      const parent = path.dirname(directory);
+      if (parent === directory) {
+        break;
+      }
+      directory = parent;
+    }
+  }
+  throw new ModulePackError("MODULE_PACK_RUNTIME_UNKNOWN");
+}
+
+/** `./dist/server/index.js` → `dist/server/index.js`, inside the module directory. */
+function moduleRelative(declared: string): string {
+  return path.posix.normalize(declared.replace(/^\.\//u, ""));
+}
+
+function portable(relative: string): boolean {
+  const segments = relative.split("/");
+  return (
+    /^[\x20-\x7e]+$/u.test(relative) &&
+    !relative.includes("\\") &&
+    segments.every((segment) => segment !== "" && segment !== "." && segment !== "..")
+  );
+}
+
+function forbidden(relative: string): boolean {
+  return (
+    /(^|\/)(src|tests?|node_modules)\//u.test(relative) ||
+    /\.(map|d\.ts|d\.mts|d\.cts)$/u.test(relative)
+  );
+}
+
+async function readTree(root: string, relative: string, files: Map<string, Buffer>): Promise<void> {
+  const directory = path.join(root, relative);
+  for (const entry of (await readdir(directory, { withFileTypes: true })).sort((left, right) =>
+    compare(left.name, right.name),
+  )) {
+    const childRelative = `${relative}/${entry.name}`;
+    const stats = await lstat(path.join(directory, entry.name));
+    if (stats.isDirectory()) {
+      await readTree(root, childRelative, files);
+    } else if (stats.isFile()) {
+      files.set(childRelative, await readFile(path.join(directory, entry.name)));
+    } else {
+      throw new ModulePackError("MODULE_PACK_MIGRATIONS_INVALID", childRelative);
+    }
+  }
+}
+
+interface BackendBundle {
+  readonly outputs: ReadonlyMap<string, Buffer>;
+  readonly inputs: readonly string[];
+}
+
+async function bundleBackend(
+  moduleDirectory: string,
+  manifest: ModuleManifest,
+  nodeRange: string,
+): Promise<BackendBundle> {
+  const declared = [
+    manifest.entrypoints.server,
+    manifest.entrypoints.schema,
+    manifest.entrypoints.jobs,
+  ].filter((entrypoint): entrypoint is string => entrypoint !== undefined);
+  const entryPoints: { in: string; out: string }[] = [];
+  for (const entrypoint of declared) {
+    const relative = moduleRelative(entrypoint);
+    if (!relative.endsWith(".js")) {
+      throw new ModulePackError("MODULE_PACK_ENTRYPOINT_UNSUPPORTED", relative);
+    }
+    try {
+      if (!(await lstat(path.join(moduleDirectory, relative))).isFile()) {
+        throw new Error("not a file");
+      }
+    } catch {
+      throw new ModulePackError("MODULE_PACK_ENTRYPOINT_MISSING", relative);
+    }
+    entryPoints.push({ in: `./${relative}`, out: relative.slice(0, -".js".length) });
+  }
+
+  const minimum = minVersion(nodeRange);
+  let result: Awaited<ReturnType<typeof build>>;
+  try {
+    result = await build({
+      absWorkingDir: moduleDirectory,
+      banner: { js: REQUIRE_BANNER },
+      bundle: true,
+      chunkNames: "dist/chunks/[name]-[hash]",
+      entryPoints,
+      format: "esm",
+      // Licence comments stay in the code as well; THIRD_PARTY_NOTICES is what satisfies the
+      // licences, never these comments alone.
+      legalComments: "eof",
+      logLevel: "silent",
+      metafile: true,
+      minify: false,
+      outdir: moduleDirectory,
+      platform: "node",
+      plugins: [nativeAddonGuard],
+      sourcemap: false,
+      splitting: true,
+      target: `node${minimum?.version ?? "24"}`,
+      write: false,
+    });
+  } catch (error) {
+    const errors =
+      isRecord(error) && Array.isArray(error.errors) ? (error.errors as Message[]) : [];
+    const native = errors.some((message) => message.pluginName === NATIVE_GUARD);
+    throw new ModulePackError(
+      native ? "MODULE_PACK_NATIVE_DEPENDENCY" : "MODULE_PACK_BUNDLE_FAILED",
+      undefined,
+      errors,
+    );
+  }
+  // A warning is a bundle that might not run: a require it could not follow, an import it could
+  // not see. An installed module has nothing to fall back on, so a warning fails packaging.
+  if (result.warnings.length > 0) {
+    throw new ModulePackError("MODULE_PACK_BUNDLE_FAILED", undefined, result.warnings);
+  }
+  const { metafile, outputFiles } = result;
+  if (metafile === undefined || outputFiles === undefined) {
+    throw new ModulePackError("MODULE_PACK_BUNDLE_FAILED");
+  }
+  for (const output of Object.values(metafile.outputs)) {
+    for (const imported of output.imports) {
+      if (imported.external && !isBuiltin(imported.path)) {
+        throw new ModulePackError("MODULE_PACK_EXTERNAL_DEPENDENCY", imported.path);
+      }
+    }
+  }
+  const outputs = new Map<string, Buffer>();
+  for (const outputFile of outputFiles) {
+    outputs.set(
+      path.relative(moduleDirectory, outputFile.path).split(path.sep).join("/"),
+      Buffer.from(outputFile.contents),
+    );
+  }
+  return {
+    inputs: Object.keys(metafile.inputs).map((input) => path.resolve(moduleDirectory, input)),
+    outputs,
+  };
+}
+
+export async function packModule(options: PackModuleOptions): Promise<ModulePackResult> {
+  if (options.target !== MODULE_PACKAGE_ANY_TARGET) {
+    throw new ModulePackError("MODULE_PACK_TARGET_UNSUPPORTED", options.target);
+  }
+  if (!/^(?:[0-9a-f]{40}|[0-9a-f]{64})$/u.test(options.sourceRevision)) {
+    throw new ModulePackError("MODULE_PACK_REVISION_INVALID");
+  }
+  const moduleDirectory = await realpath(path.resolve(options.moduleDirectory)).catch(() => {
+    throw new ModulePackError("MODULE_PACK_MANIFEST_INVALID");
+  });
+
+  const manifestBytes = await readFile(path.join(moduleDirectory, "ekklesia.module.json")).catch(
+    () => {
+      throw new ModulePackError("MODULE_PACK_MANIFEST_INVALID");
+    },
+  );
+  let manifestInput: unknown;
+  try {
+    manifestInput = JSON.parse(manifestBytes.toString("utf8"));
+  } catch {
+    throw new ModulePackError("MODULE_PACK_MANIFEST_INVALID");
+  }
+  const parsedManifest = safeParseModuleManifest(manifestInput);
+  if (!parsedManifest.success) {
+    throw new ModulePackError("MODULE_PACK_MANIFEST_INVALID");
+  }
+  const manifest = parsedManifest.data;
+  const developmentPackage = await readJson(path.join(moduleDirectory, "package.json")).catch(
+    () => undefined,
+  );
+  if (
+    !isRecord(developmentPackage) ||
+    typeof developmentPackage.name !== "string" ||
+    developmentPackage.name === "" ||
+    developmentPackage.version !== manifest.version
+  ) {
+    throw new ModulePackError("MODULE_PACK_IDENTITY_MISMATCH");
+  }
+
+  const nodeRange = options.nodeRange ?? (await workspaceNodeRange(moduleDirectory));
+  if (validRange(nodeRange) === null) {
+    throw new ModulePackError("MODULE_PACK_RUNTIME_UNKNOWN");
+  }
+
+  // 1. The backend, bundled with every pure-JavaScript dependency it uses.
+  const backend = await bundleBackend(moduleDirectory, manifest, nodeRange);
+
+  // 2. The browser artifacts, exactly as built, with what went into each.
+  let ui: Awaited<ReturnType<typeof analyzeModuleUi>>;
+  try {
+    ui = await analyzeModuleUi({ moduleDirectory });
+  } catch (error) {
+    throw new ModulePackError(
+      "MODULE_PACK_UI_STALE",
+      error instanceof ModuleUiBuildError ? error.code : undefined,
+    );
+  }
+
+  // 3. Every bundled source file traced to its package.
+  const index = new BundledPackageIndex();
+  const components = new Map<
+    string,
+    { bundled: Awaited<ReturnType<typeof index.packageOf>>; uses: Set<NoticeUse> }
+  >();
+  const incorporates = new Map<string, string>();
+  const drizzleVersions = new Set<string>();
+  const sources: { readonly file: string; readonly use: NoticeUse }[] = [
+    ...backend.inputs.map((file) => ({ file, use: "backend" as const })),
+    ...ui.artifacts.flatMap((artifact) =>
+      artifact.inputs.map((file) => ({ file, use: "browser" as const })),
+    ),
+  ];
+  for (const { file, use } of sources) {
+    const bundled = await index.packageOf(file);
+    if (bundled === undefined || bundled.root === moduleDirectory) {
+      continue;
+    }
+    if (!bundled.thirdParty) {
+      if (bundled.name.startsWith("@ekklesia/")) {
+        const known = incorporates.get(bundled.name);
+        if (known !== undefined && known !== bundled.version) {
+          throw new ModulePackError("MODULE_PACK_INCORPORATED_CONFLICT", bundled.name);
+        }
+        incorporates.set(bundled.name, bundled.version);
+      }
+      continue;
+    }
+    if (use === "backend" && bundled.name === "drizzle-orm") {
+      drizzleVersions.add(bundled.version);
+    }
+    const key = `${bundled.name}@${bundled.version}`;
+    const existing = components.get(key);
+    if (existing) {
+      existing.uses.add(use);
+    } else {
+      if (use === "backend" && (await isNativeOrPlatformSpecific(bundled))) {
+        throw new ModulePackError("MODULE_PACK_NATIVE_DEPENDENCY", key);
+      }
+      components.set(key, { bundled, uses: new Set([use]) });
+    }
+  }
+  if (drizzleVersions.size > 1) {
+    throw new ModulePackError("MODULE_PACK_DATABASE_RUNTIME_CONFLICT");
+  }
+  const sdk = incorporates.get("@ekklesia/module-sdk");
+  if (sdk !== undefined && !satisfies(sdk, manifest.compatibility.moduleSdk)) {
+    throw new ModulePackError("MODULE_PACK_SDK_INCOMPATIBLE", sdk);
+  }
+
+  // 4. The payload.
+  const files = new Map<string, Buffer>();
+  const add = (relative: string, data: Buffer): void => {
+    if (!portable(relative)) {
+      throw new ModulePackError("MODULE_PACK_PATH_UNSUPPORTED", relative);
+    }
+    if (forbidden(relative)) {
+      throw new ModulePackError("MODULE_PACK_FORBIDDEN_FILE", relative);
+    }
+    if (files.has(relative) || relative === MODULE_PACKAGE_METADATA_FILENAME) {
+      throw new ModulePackError("MODULE_PACK_LAYOUT_CONFLICT", relative);
+    }
+    files.set(relative, data);
+  };
+  for (const [relative, data] of backend.outputs) {
+    add(relative, data);
+  }
+  for (const artifact of ui.artifacts) {
+    if (!artifact.builtArtifactCurrent) {
+      throw new ModulePackError(
+        "MODULE_PACK_UI_STALE",
+        path.relative(moduleDirectory, artifact.outputFile),
+      );
+    }
+    add(
+      path.relative(moduleDirectory, artifact.outputFile).split(path.sep).join("/"),
+      await readFile(artifact.outputFile),
+    );
+  }
+  if (manifest.entrypoints.migrations !== undefined) {
+    const migrations = new Map<string, Buffer>();
+    try {
+      await readTree(moduleDirectory, moduleRelative(manifest.entrypoints.migrations), migrations);
+    } catch (error) {
+      if (error instanceof ModulePackError) {
+        throw error;
+      }
+      throw new ModulePackError("MODULE_PACK_MIGRATIONS_INVALID");
+    }
+    for (const [relative, data] of migrations) {
+      add(relative, data);
+    }
+  }
+  add("ekklesia.module.json", manifestBytes);
+  add(
+    "package.json",
+    Buffer.from(
+      `${JSON.stringify(
+        modulePackageRuntimePackage({ name: developmentPackage.name, version: manifest.version }),
+        null,
+        2,
+      )}\n`,
+    ),
+  );
+  try {
+    add(
+      MODULE_PACKAGE_NOTICES_FILENAME,
+      Buffer.from(await thirdPartyNotices(components as ReadonlyMap<string, NoticeComponent>)),
+    );
+  } catch (error) {
+    if (error instanceof NoticeError) {
+      throw new ModulePackError(error.code, error.component);
+    }
+    throw error;
+  }
+
+  // 5. The metadata, checked against its own contract before anything is written.
+  const listed = [...files.entries()]
+    .sort(([left], [right]) => compare(left, right))
+    .map(([relative, data]) => ({ path: relative, sha256: sha256(data), size: data.length }));
+  const metadata = {
+    packageFormat: MODULE_PACKAGE_FORMAT,
+    module: { id: manifest.id, version: manifest.version },
+    target: MODULE_PACKAGE_ANY_TARGET,
+    runtime: { node: nodeRange },
+    provenance: {
+      revision: options.sourceRevision,
+      ...(options.repository === undefined ? {} : { repository: options.repository }),
+      packager: await packagerIdentity(),
+    },
+    incorporates: Object.fromEntries(
+      [...incorporates].sort(([left], [right]) => compare(left, right)),
+    ),
+    ...(drizzleVersions.size === 1
+      ? { transitional: { databaseRuntime: { "drizzle-orm": [...drizzleVersions][0] } } }
+      : {}),
+    files: listed.map((file) => ({ path: file.path, size: file.size, sha256: file.sha256 })),
+  };
+  if (!safeParseModulePackageMetadata(metadata).success) {
+    throw new ModulePackError("MODULE_PACK_METADATA_INVALID");
+  }
+  const payload = new Map(files);
+  payload.set(
+    MODULE_PACKAGE_METADATA_FILENAME,
+    Buffer.from(`${JSON.stringify(metadata, null, 2)}\n`),
+  );
+
+  // 6. The archive and its digest.
+  let archive: Buffer;
+  try {
+    archive = deterministicTarGz(manifest.id, payload);
+  } catch (error) {
+    if (error instanceof TarPathError) {
+      throw new ModulePackError("MODULE_PACK_PATH_UNSUPPORTED", error.path);
+    }
+    throw error;
+  }
+  const digest = sha256(archive);
+  const fileName = modulePackageArchiveFileName(
+    manifest.id,
+    manifest.version,
+    MODULE_PACKAGE_ANY_TARGET,
+  );
+  const outDirectory = path.resolve(options.outDirectory);
+  const archivePath = path.join(outDirectory, fileName);
+  const sha256Path = `${archivePath}.sha256`;
+  try {
+    await mkdir(outDirectory, { recursive: true });
+    const staging = `${archivePath}.partial-${process.pid}`;
+    await writeFile(staging, archive);
+    await rename(staging, archivePath);
+    await writeFile(`${sha256Path}.partial-${process.pid}`, `${digest}  ${fileName}\n`);
+    await rename(`${sha256Path}.partial-${process.pid}`, sha256Path);
+  } catch {
+    throw new ModulePackError("MODULE_PACK_OUTPUT_FAILED");
+  }
+
+  return Object.freeze({
+    archiveBytes: archive.length,
+    archivePath,
+    fileCount: listed.length,
+    moduleId: manifest.id,
+    sha256: digest,
+    sha256Path,
+    target: MODULE_PACKAGE_ANY_TARGET,
+    version: manifest.version,
+  });
+}
diff --git a/packages/module-pack/src/packages.ts b/packages/module-pack/src/packages.ts
new file mode 100644
index 0000000..be2cb0c
--- /dev/null
+++ b/packages/module-pack/src/packages.ts
@@ -0,0 +1,154 @@
+import { access, readdir, readFile, realpath } from "node:fs/promises";
+import path from "node:path";
+
+/**
+ * What the packager knows about a package whose files were bundled: where it is, what it is called,
+ * and whether it is third-party software. A package installed under a `node_modules` directory is
+ * third-party; one that is not (a workspace package, or the module itself) is the platform's or the
+ * module's own code.
+ */
+export interface BundledPackage {
+  readonly root: string;
+  readonly name: string;
+  readonly version: string;
+  readonly thirdParty: boolean;
+  readonly manifest: Readonly<Record<string, unknown>>;
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+async function readManifest(directory: string): Promise<Record<string, unknown> | undefined> {
+  try {
+    const parsed = JSON.parse(
+      await readFile(path.join(directory, "package.json"), "utf8"),
+    ) as unknown;
+    return isRecord(parsed) ? parsed : undefined;
+  } catch {
+    return undefined;
+  }
+}
+
+/** Finds the package a bundled file belongs to: the nearest enclosing directory whose package.json
+ * names a package and its version. Nested `package.json` files that only set a module type, as
+ * some libraries ship in subdirectories, are skipped. */
+export class BundledPackageIndex {
+  readonly #byDirectory = new Map<string, BundledPackage | undefined>();
+
+  async packageOf(file: string): Promise<BundledPackage | undefined> {
+    let directory = path.dirname(await realpath(file).catch(() => file));
+    const visited: string[] = [];
+    let found: BundledPackage | undefined;
+    for (;;) {
+      if (this.#byDirectory.has(directory)) {
+        found = this.#byDirectory.get(directory);
+        break;
+      }
+      visited.push(directory);
+      const manifest = await readManifest(directory);
+      if (manifest && typeof manifest.name === "string" && typeof manifest.version === "string") {
+        found = Object.freeze({
+          manifest: Object.freeze(manifest),
+          name: manifest.name,
+          root: directory,
+          thirdParty: directory.split(path.sep).includes("node_modules"),
+          version: manifest.version,
+        });
+        break;
+      }
+      const parent = path.dirname(directory);
+      if (parent === directory) {
+        break;
+      }
+      directory = parent;
+    }
+    for (const seen of visited) {
+      this.#byDirectory.set(seen, found);
+    }
+    return found;
+  }
+}
+
+async function exists(file: string): Promise<boolean> {
+  try {
+    await access(file);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+function declaresPlatform(manifest: Readonly<Record<string, unknown>>): boolean {
+  return ["os", "cpu", "libc"].some((field) => manifest[field] !== undefined);
+}
+
+async function containsCompiledAddon(directory: string): Promise<boolean> {
+  const entries = await readdir(directory, { withFileTypes: true }).catch(() => []);
+  for (const entry of entries) {
+    if (entry.isDirectory()) {
+      if (
+        entry.name !== "node_modules" &&
+        (await containsCompiledAddon(path.join(directory, entry.name)))
+      ) {
+        return true;
+      }
+    } else if (entry.name.toLowerCase().endsWith(".node")) {
+      return true;
+    }
+  }
+  return false;
+}
+
+/** The installed package a dependency name resolves to from `root`, by Node's own directory walk. */
+async function installedDependency(
+  root: string,
+  name: string,
+): Promise<Record<string, unknown> | undefined> {
+  let directory = root;
+  for (;;) {
+    if (path.basename(directory) !== "node_modules") {
+      const manifest = await readManifest(path.join(directory, "node_modules", ...name.split("/")));
+      if (manifest) {
+        return manifest;
+      }
+    }
+    const parent = path.dirname(directory);
+    if (parent === directory) {
+      return undefined;
+    }
+    directory = parent;
+  }
+}
+
+/**
+ * Whether a bundled package is native or platform-specific, which an `any` package may never
+ * contain (ADR 0049): it declares an operating system, CPU, or C library; it is built with node-gyp;
+ * it ships a compiled `.node` addon; or one of its installed dependencies declares a platform, as
+ * packages that load a per-platform binary do.
+ */
+export async function isNativeOrPlatformSpecific(bundled: BundledPackage): Promise<boolean> {
+  const manifest = bundled.manifest;
+  if (declaresPlatform(manifest) || manifest.gypfile === true) {
+    return true;
+  }
+  if (await exists(path.join(bundled.root, "binding.gyp"))) {
+    return true;
+  }
+  if (await containsCompiledAddon(bundled.root)) {
+    return true;
+  }
+  for (const field of ["dependencies", "optionalDependencies"]) {
+    const dependencies = manifest[field];
+    if (!isRecord(dependencies)) {
+      continue;
+    }
+    for (const name of Object.keys(dependencies)) {
+      const dependency = await installedDependency(bundled.root, name);
+      if (dependency && declaresPlatform(dependency)) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
diff --git a/packages/module-pack/src/tar.ts b/packages/module-pack/src/tar.ts
new file mode 100644
index 0000000..ead1115
--- /dev/null
+++ b/packages/module-pack/src/tar.ts
@@ -0,0 +1,109 @@
+import { gzipSync } from "node:zlib";
+
+/**
+ * The deterministic archive encoding of Ekklesia Module Package v1 (ADR 0049).
+ *
+ * POSIX ustar, written by hand rather than by a general tar library, so every byte is decided here:
+ * - one top-level directory, then every directory and regular file in byte-wise path order, which
+ *   puts every directory before what it contains;
+ * - uid and gid 0, empty user and group names, modification time 0, device fields 0;
+ * - directories 0755 and files 0644; no links, no special files, no extended or long-name headers;
+ * - exactly two zero blocks at the end;
+ * - gzip at a fixed level, with Node's header: no file name and a modification time of 0.
+ *
+ * The same packager version and the same input bytes therefore always produce the same archive.
+ */
+
+export class TarPathError extends Error {
+  readonly path: string;
+
+  constructor(entryPath: string) {
+    super("A path does not fit a portable ustar header.");
+    this.name = "TarPathError";
+    this.path = entryPath;
+  }
+}
+
+const BLOCK = 512;
+const GZIP_LEVEL = 9;
+
+function octal(value: number, width: number): string {
+  return `${value.toString(8).padStart(width - 1, "0")}\u0000`;
+}
+
+/** Splits a path into ustar's 155-byte prefix and 100-byte name, at a `/`. */
+function splitPath(entryPath: string): { readonly name: string; readonly prefix: string } {
+  if (entryPath.length <= 100) {
+    return { name: entryPath, prefix: "" };
+  }
+  for (let index = entryPath.length - 1; index > 0; index -= 1) {
+    if (entryPath[index] === "/") {
+      const prefix = entryPath.slice(0, index);
+      const name = entryPath.slice(index + 1);
+      if (prefix.length <= 155 && name.length > 0 && name.length <= 100) {
+        return { name, prefix };
+      }
+    }
+  }
+  throw new TarPathError(entryPath);
+}
+
+function header(entryPath: string, directory: boolean, size: number): Buffer {
+  const block = Buffer.alloc(BLOCK);
+  const { name, prefix } = splitPath(directory ? `${entryPath}/` : entryPath);
+  block.write(name, 0, 100, "latin1");
+  block.write(octal(directory ? 0o755 : 0o644, 8), 100, "latin1");
+  block.write(octal(0, 8), 108, "latin1");
+  block.write(octal(0, 8), 116, "latin1");
+  block.write(octal(size, 12), 124, "latin1");
+  block.write(octal(0, 12), 136, "latin1");
+  block.write("        ", 148, "latin1");
+  block.write(directory ? "5" : "0", 156, "latin1");
+  block.write("ustar\u000000", 257, "latin1");
+  block.write(octal(0, 8), 329, "latin1");
+  block.write(octal(0, 8), 337, "latin1");
+  block.write(prefix, 345, 155, "latin1");
+  let checksum = 0;
+  for (const byte of block) {
+    checksum += byte;
+  }
+  block.write(`${checksum.toString(8).padStart(6, "0")}\u0000 `, 148, "latin1");
+  return block;
+}
+
+function compareBytes(left: string, right: string): number {
+  return left < right ? -1 : left > right ? 1 : 0;
+}
+
+/**
+ * Archives `files` (paths relative to the module directory, printable ASCII) under `topLevel`.
+ * Directories are implied by the file paths.
+ */
+export function deterministicTarGz(topLevel: string, files: ReadonlyMap<string, Buffer>): Buffer {
+  const directories = new Set<string>([topLevel]);
+  for (const filePath of files.keys()) {
+    const segments = filePath.split("/");
+    for (let index = 1; index < segments.length; index += 1) {
+      directories.add(`${topLevel}/${segments.slice(0, index).join("/")}`);
+    }
+  }
+  const entries: { readonly path: string; readonly data?: Buffer }[] = [
+    ...[...directories].map((directory) => ({ path: directory })),
+    ...[...files].map(([filePath, data]) => ({ data, path: `${topLevel}/${filePath}` })),
+  ].sort((left, right) => compareBytes(left.path, right.path));
+
+  const parts: Buffer[] = [];
+  for (const entry of entries) {
+    if (entry.data === undefined) {
+      parts.push(header(entry.path, true, 0));
+    } else {
+      parts.push(header(entry.path, false, entry.data.length), entry.data);
+      const padding = (BLOCK - (entry.data.length % BLOCK)) % BLOCK;
+      if (padding > 0) {
+        parts.push(Buffer.alloc(padding));
+      }
+    }
+  }
+  parts.push(Buffer.alloc(BLOCK * 2));
+  return gzipSync(Buffer.concat(parts), { level: GZIP_LEVEL });
+}
diff --git a/packages/module-pack/tests/cli.test.ts b/packages/module-pack/tests/cli.test.ts
new file mode 100644
index 0000000..22094be
--- /dev/null
+++ b/packages/module-pack/tests/cli.test.ts
@@ -0,0 +1,74 @@
+import { describe, expect, it } from "vitest";
+import { parsePackModuleArguments } from "../src/cli.js";
+
+const revision = "86ae907f59458508e3277666cdd214f5bd7c1078";
+
+describe("ekklesia-pack-module arguments", () => {
+  it("takes the module, the target, the output directory, and the source revision", () => {
+    expect(
+      parsePackModuleArguments([
+        "--module",
+        "templates/module",
+        "--target",
+        "any",
+        "--out",
+        "dist/packages",
+        "--source-revision",
+        revision,
+      ]),
+    ).toEqual({
+      moduleDirectory: "templates/module",
+      outDirectory: "dist/packages",
+      sourceRevision: revision,
+      target: "any",
+    });
+  });
+
+  it("records a repository only when one is given", () => {
+    expect(
+      parsePackModuleArguments([
+        "--module",
+        ".",
+        "--target",
+        "any",
+        "--out",
+        "out",
+        "--source-revision",
+        revision,
+        "--repository",
+        "https://example.org/acme/example.git",
+      ]).repository,
+    ).toBe("https://example.org/acme/example.git");
+  });
+
+  it.each([
+    ["no arguments", []],
+    ["a missing target", ["--module", ".", "--out", "o", "--source-revision", revision]],
+    ["a missing revision", ["--module", ".", "--target", "any", "--out", "o"]],
+    [
+      "an unknown option",
+      ["--module", ".", "--target", "any", "--out", "o", "--source-revision", revision, "--legacy"],
+    ],
+    [
+      "a repeated option",
+      [
+        "--module",
+        ".",
+        "--module",
+        "..",
+        "--target",
+        "any",
+        "--out",
+        "o",
+        "--source-revision",
+        revision,
+      ],
+    ],
+    [
+      "a stray positional argument",
+      ["module", "--target", "any", "--out", "o", "--source-revision", revision],
+    ],
+  ])("refuses %s", (_label, argv) => {
+    expect(() => parsePackModuleArguments(argv)).toThrow();
+  });
+});
diff --git a/packages/module-pack/tests/pack-module.test.ts b/packages/module-pack/tests/pack-module.test.ts
new file mode 100644
index 0000000..956b206
--- /dev/null
+++ b/packages/module-pack/tests/pack-module.test.ts
@@ -0,0 +1,434 @@
+import { createHash } from "node:crypto";
+import { readFile } from "node:fs/promises";
+import { isBuiltin } from "node:module";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import { type ModulePackErrorCode, ModulePackError, packModule } from "../src/index.js";
+import {
+  cleanupFixtures,
+  type FixtureModuleOptions,
+  fixtureModule,
+  SOURCE_REVISION,
+  scratchDirectory,
+} from "./support/fixture-module.js";
+import { fileEntries, readTarGz } from "./support/tar.js";
+
+afterEach(cleanupFixtures);
+
+const MIT = "MIT License\n\nCopyright (c) 2026 Example Author\n\nPermission is hereby granted.\n";
+
+async function pack(options: FixtureModuleOptions = {}, overrides: Record<string, unknown> = {}) {
+  const moduleDirectory = await fixtureModule(options);
+  const outDirectory = await scratchDirectory("ekklesia-pack-out-");
+  const result = await packModule({
+    moduleDirectory,
+    nodeRange: ">=24.11.0 <25",
+    outDirectory,
+    sourceRevision: SOURCE_REVISION,
+    target: "any",
+    ...overrides,
+  });
+  return { archive: await readFile(result.archivePath), moduleDirectory, outDirectory, result };
+}
+
+async function packRejection(
+  options: FixtureModuleOptions,
+  code: ModulePackErrorCode,
+  overrides: Record<string, unknown> = {},
+): Promise<ModulePackError> {
+  try {
+    await pack(options, overrides);
+  } catch (error) {
+    expect(error).toBeInstanceOf(ModulePackError);
+    expect((error as ModulePackError).code).toBe(code);
+    return error as ModulePackError;
+  }
+  throw new Error(`Expected ${code}.`);
+}
+
+describe("packModule: what a package contains (ADR 0049)", () => {
+  it("produces one archive and its sha256sum line, under the recommended name", async () => {
+    const { archive, outDirectory, result } = await pack();
+    const digest = createHash("sha256").update(archive).digest("hex");
+    expect(path.basename(result.archivePath)).toBe("example-0.1.0-any.tar.gz");
+    expect(result.sha256).toBe(digest);
+    expect(await readFile(path.join(outDirectory, "example-0.1.0-any.tar.gz.sha256"), "utf8")).toBe(
+      `${digest}  example-0.1.0-any.tar.gz\n`,
+    );
+  });
+
+  it("holds exactly the runtime payload, under one top-level directory named with the module id", async () => {
+    const { archive } = await pack({ withSchema: true });
+    const files = [...fileEntries(archive).keys()].sort();
+    expect(files).toEqual([
+      "example/THIRD_PARTY_NOTICES",
+      expect.stringMatching(/^example\/dist\/chunks\/chunk-[A-Z0-9]+\.js$/u),
+      "example/dist/schema/index.js",
+      "example/dist/server/index.js",
+      "example/drizzle/0000_initial.sql",
+      "example/drizzle/meta/0000_snapshot.json",
+      "example/drizzle/meta/_ekklesia.json",
+      "example/drizzle/meta/_journal.json",
+      "example/ekklesia.module.json",
+      "example/ekklesia.package.json",
+      "example/package.json",
+    ]);
+    for (const file of files) {
+      expect(file).not.toMatch(/\/src\/|\/tests\/|\.d\.ts$|\.map$|README|node_modules/u);
+    }
+    expect(new Set(readTarGz(archive).map((entry) => entry.path.split("/")[0]))).toEqual(
+      new Set(["example"]),
+    );
+  });
+
+  it("generates the runtime package.json instead of copying the development one", async () => {
+    const { archive } = await pack();
+    const runtimePackage = fileEntries(archive).get("example/package.json")?.toString("utf8");
+    expect(JSON.parse(runtimePackage ?? "")).toEqual({
+      name: "@test/module-example",
+      version: "0.1.0",
+      private: true,
+      type: "module",
+      ekklesia: { layer: "module" },
+    });
+    for (const [file, data] of fileEntries(archive)) {
+      if (file.endsWith(".json")) {
+        expect(data.toString("utf8"), file).not.toContain("workspace:");
+      }
+    }
+  });
+
+  it("copies the manifest byte for byte", async () => {
+    const { archive, moduleDirectory } = await pack();
+    expect(fileEntries(archive).get("example/ekklesia.module.json")).toEqual(
+      await readFile(path.join(moduleDirectory, "ekklesia.module.json")),
+    );
+  });
+
+  it("describes the package completely in ekklesia.package.json, never hashing itself", async () => {
+    const { archive } = await pack({ withSchema: true });
+    const files = fileEntries(archive);
+    const metadata = JSON.parse(files.get("example/ekklesia.package.json")?.toString("utf8") ?? "");
+    expect(metadata).toMatchObject({
+      packageFormat: 1,
+      module: { id: "example", version: "0.1.0" },
+      target: "any",
+      runtime: { node: ">=24.11.0 <25" },
+      provenance: {
+        revision: SOURCE_REVISION,
+        packager: { name: "@ekklesia/module-pack", version: expect.any(String) },
+      },
+      incorporates: {
+        "@ekklesia/contracts": expect.any(String),
+        "@ekklesia/module-sdk": expect.any(String),
+      },
+      transitional: { databaseRuntime: { "drizzle-orm": "0.45.2" } },
+    });
+    const listed = metadata.files.map((file: { path: string }) => `example/${file.path}`);
+    expect(listed).not.toContain("example/ekklesia.package.json");
+    expect(new Set(listed)).toEqual(
+      new Set([...files.keys()].filter((file) => file !== "example/ekklesia.package.json")),
+    );
+    for (const file of metadata.files as { path: string; size: number; sha256: string }[]) {
+      const data = files.get(`example/${file.path}`);
+      expect(data?.length).toBe(file.size);
+      expect(
+        createHash("sha256")
+          .update(data ?? "")
+          .digest("hex"),
+      ).toBe(file.sha256);
+    }
+  });
+
+  it("records only the provenance it was given, and a repository only when asked", async () => {
+    const { archive } = await pack({}, { repository: "https://example.org/acme/example.git" });
+    const metadata = JSON.parse(
+      fileEntries(archive).get("example/ekklesia.package.json")?.toString("utf8") ?? "",
+    );
+    expect(metadata.provenance.repository).toBe("https://example.org/acme/example.git");
+  });
+
+  it("omits transitional database facts from a module that bundles no Drizzle", async () => {
+    const { archive } = await pack({
+      serverSource: 'export default { id: "example", version: "0.1.0", register() {} };\n',
+    });
+    const metadata = JSON.parse(
+      fileEntries(archive).get("example/ekklesia.package.json")?.toString("utf8") ?? "",
+    );
+    expect(metadata.transitional).toBeUndefined();
+    expect(metadata.incorporates).toEqual({});
+  });
+});
+
+describe("packModule: a self-contained backend", () => {
+  it("bundles the SDK, contracts, and Drizzle, leaving only Node built-ins to import", async () => {
+    const { archive } = await pack({ withSchema: true });
+    for (const [file, data] of fileEntries(archive)) {
+      if (!file.endsWith(".js")) {
+        continue;
+      }
+      const code = data.toString("utf8");
+      const specifiers = [
+        ...code.matchAll(/(?:^|\n)\s*(?:import|export)\s[^;]*?from\s*"([^"]+)"/gu),
+        ...code.matchAll(/(?:^|\n)\s*import\s*"([^"]+)"/gu),
+        ...code.matchAll(/\bimport\(\s*"([^"]+)"\s*\)/gu),
+      ].map((match) => match[1] ?? "");
+      for (const specifier of specifiers) {
+        expect(specifier.startsWith(".") || isBuiltin(specifier), `${file}: ${specifier}`).toBe(
+          true,
+        );
+      }
+    }
+  });
+
+  it("refuses a dependency the bundle cannot resolve rather than leaving it external", async () => {
+    await packRejection(
+      {
+        serverSource:
+          'import pad from "ekklesia-not-installed";\nexport default { id: "example", version: "0.1.0", register() { pad(); } };\n',
+      },
+      "MODULE_PACK_BUNDLE_FAILED",
+    );
+  });
+
+  it.each([
+    [
+      "a package that declares an operating system",
+      {
+        name: "fake-native",
+        packageJson: { os: ["linux"], cpu: ["x64"] },
+        files: { "index.js": "export default 1;\n" },
+      },
+    ],
+    [
+      "a package built with node-gyp",
+      {
+        name: "fake-gyp",
+        packageJson: { gypfile: true },
+        files: { "index.js": "export default 1;\n", "binding.gyp": "{}" },
+      },
+    ],
+    [
+      "a package that ships a compiled addon",
+      {
+        name: "fake-addon",
+        files: {
+          "index.js": "export default 1;\n",
+          "build/Release/addon.node": new Uint8Array([0x7f, 0x45, 0x4c, 0x46]),
+        },
+      },
+    ],
+  ])("refuses %s in an any-target package", async (_label, fake) => {
+    await packRejection(
+      {
+        fakePackages: [fake],
+        serverSource: `import value from "${fake.name}";\nexport default { id: "example", version: "0.1.0", register() { return value; } };\n`,
+      },
+      "MODULE_PACK_NATIVE_DEPENDENCY",
+    );
+  });
+
+  it("refuses a package whose installed dependency is platform-specific", async () => {
+    await packRejection(
+      {
+        fakePackages: [
+          {
+            name: "fake-wrapper",
+            packageJson: { optionalDependencies: { "fake-wrapper-linux-x64": "1.0.0" } },
+            files: { "index.js": "export default 1;\n", LICENSE: MIT },
+          },
+          {
+            name: "fake-wrapper-linux-x64",
+            packageJson: { os: ["linux"], cpu: ["x64"] },
+            files: { "index.js": "export default 2;\n" },
+          },
+        ],
+        serverSource:
+          'import value from "fake-wrapper";\nexport default { id: "example", version: "0.1.0", register() { return value; } };\n',
+      },
+      "MODULE_PACK_NATIVE_DEPENDENCY",
+    );
+  });
+
+  it("refuses any target but any in this release", async () => {
+    await packRejection({}, "MODULE_PACK_TARGET_UNSUPPORTED", { target: "linux-x64-glibc" });
+  });
+});
+
+describe("packModule: identity and inputs", () => {
+  it("refuses a development package.json whose version differs from the manifest", async () => {
+    await packRejection(
+      { manifest: (manifest) => ({ ...manifest, version: "0.2.0" }) },
+      "MODULE_PACK_IDENTITY_MISMATCH",
+    );
+  });
+
+  it("refuses a module whose backend was never built", async () => {
+    await packRejection(
+      {
+        manifest: (manifest) => ({
+          ...manifest,
+          entrypoints: { server: "./dist/missing/index.js" },
+        }),
+      },
+      "MODULE_PACK_ENTRYPOINT_MISSING",
+    );
+  });
+
+  it("refuses an abbreviated or missing source revision", async () => {
+    await packRejection({}, "MODULE_PACK_REVISION_INVALID", { sourceRevision: "86ae907" });
+  });
+
+  it("refuses an incorporated SDK outside the manifest's own range", async () => {
+    await packRejection(
+      {
+        manifest: (manifest) => ({
+          ...manifest,
+          compatibility: { platform: "^0.1.0", moduleSdk: "^9.0.0" },
+        }),
+      },
+      "MODULE_PACK_SDK_INCOMPATIBLE",
+    );
+  });
+});
+
+describe("packModule: THIRD_PARTY_NOTICES", () => {
+  const usesFake = (name: string) =>
+    `import value from "${name}";\nexport default { id: "example", version: "0.1.0", register() { return value; } };\n`;
+
+  it("credits every bundled third-party package once, with its licence and notice text", async () => {
+    const { archive } = await pack({
+      fakePackages: [
+        {
+          name: "fake-mit",
+          version: "2.3.4",
+          files: {
+            "index.js": 'import other from "fake-apache-notice";\nexport default other;\n',
+            LICENSE: MIT,
+          },
+        },
+        {
+          name: "fake-apache-notice",
+          version: "1.0.0",
+          packageJson: { license: "Apache-2.0" },
+          files: {
+            "index.js": "export default 1;\n",
+            "LICENSE.txt": "Apache License text shipped by the package.\n",
+            NOTICE: "Fake Apache Notice\nCopyright 2026 The Fake Foundation\n",
+          },
+        },
+      ],
+      serverSource: usesFake("fake-mit"),
+    });
+    const notices = fileEntries(archive).get("example/THIRD_PARTY_NOTICES")?.toString("utf8") ?? "";
+    expect(notices).toContain("fake-mit 2.3.4");
+    expect(notices).toContain("Copyright (c) 2026 Example Author");
+    expect(notices).toContain("fake-apache-notice 1.0.0");
+    expect(notices).toContain("Copyright 2026 The Fake Foundation");
+    expect(notices.match(/^fake-mit 2\.3\.4$/gmu)).toHaveLength(1);
+    // Only what the bundle actually contains is credited: this backend uses no Drizzle code.
+    expect(notices).not.toContain("drizzle-orm");
+    // The Ekklesia platform's own packages are credited in ekklesia.package.json, not here.
+    expect(notices).not.toMatch(/^@ekklesia\//mu);
+  });
+
+  it("supplies the standard Apache-2.0 text only for a package that ships none, and says so", async () => {
+    const { archive } = await pack({ withSchema: true });
+    const notices = fileEntries(archive).get("example/THIRD_PARTY_NOTICES")?.toString("utf8") ?? "";
+    const drizzle = notices.slice(notices.indexOf("drizzle-orm 0.45.2"));
+    expect(drizzle).toContain("License: Apache-2.0");
+    expect(drizzle).toContain("ships no licence file");
+    expect(drizzle).toContain("TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION");
+  });
+
+  it("is byte-identical across packages of the same inputs", async () => {
+    const options = { withSchema: true };
+    const first = await pack(options);
+    const second = await pack(options);
+    expect(fileEntries(first.archive).get("example/THIRD_PARTY_NOTICES")).toEqual(
+      fileEntries(second.archive).get("example/THIRD_PARTY_NOTICES"),
+    );
+  });
+
+  it("refuses a bundled package that declares no licence", async () => {
+    await packRejection(
+      {
+        fakePackages: [
+          {
+            name: "fake-unlicensed",
+            packageJson: { license: undefined },
+            files: { "index.js": "export default 1;\n" },
+          },
+        ],
+        serverSource: usesFake("fake-unlicensed"),
+      },
+      "MODULE_PACK_LICENCE_UNKNOWN",
+    );
+  });
+
+  it("refuses an MIT package that ships no licence text, because only it holds the copyright line", async () => {
+    await packRejection(
+      {
+        fakePackages: [{ name: "fake-textless", files: { "index.js": "export default 1;\n" } }],
+        serverSource: usesFake("fake-textless"),
+      },
+      "MODULE_PACK_LICENCE_TEXT_MISSING",
+    );
+  });
+});
+
+describe("packModule: deterministic archives", () => {
+  it("produces byte-identical archives and digests for identical inputs", async () => {
+    const moduleDirectory = await fixtureModule({ withSchema: true });
+    const runs = [];
+    for (let run = 0; run < 2; run += 1) {
+      const outDirectory = await scratchDirectory("ekklesia-pack-out-");
+      const result = await packModule({
+        moduleDirectory,
+        nodeRange: ">=24.11.0 <25",
+        outDirectory,
+        sourceRevision: SOURCE_REVISION,
+        target: "any",
+      });
+      runs.push({ bytes: await readFile(result.archivePath), sha256: result.sha256 });
+    }
+    expect(runs[0]?.sha256).toBe(runs[1]?.sha256);
+    expect(runs[0]?.bytes.equals(runs[1]?.bytes ?? Buffer.alloc(0))).toBe(true);
+  });
+
+  it("normalizes every entry and the gzip header, and contains no links", async () => {
+    const { archive } = await pack({ withSchema: true });
+    // gzip: no file name flag, no modification time.
+    expect(archive[3]).toBe(0);
+    expect(archive.readUInt32LE(4)).toBe(0);
+
+    const entries = readTarGz(archive);
+    const paths = entries.map((entry) => entry.path);
+    expect(paths).toEqual(
+      [...paths].sort((left, right) => (left < right ? -1 : left > right ? 1 : 0)),
+    );
+    for (const entry of entries) {
+      expect(["0", "5"], entry.path).toContain(entry.typeflag);
+      expect(entry.mode, entry.path).toBe(entry.typeflag === "5" ? 0o755 : 0o644);
+      expect([entry.uid, entry.gid, entry.mtime]).toEqual([0, 0, 0]);
+      expect([entry.uname, entry.gname]).toEqual(["", ""]);
+      expect(entry.magic).toBe("ustar/00");
+    }
+    // Every directory precedes what it contains.
+    for (const entry of entries) {
+      const parent = entry.path.split("/").slice(0, -1).join("/");
+      if (parent !== "") {
+        expect(paths.indexOf(parent), entry.path).toBeLessThan(paths.indexOf(entry.path));
+      }
+    }
+  });
+
+  it("refers to no absolute path of the build machine", async () => {
+    const { archive, moduleDirectory } = await pack({ withSchema: true });
+    const root = path.dirname(path.dirname(moduleDirectory));
+    for (const [file, data] of fileEntries(archive)) {
+      expect(data.toString("utf8"), file).not.toContain(moduleDirectory);
+      expect(data.toString("utf8"), file).not.toContain(root);
+    }
+  });
+});
diff --git a/packages/module-pack/tests/support/fixture-module.ts b/packages/module-pack/tests/support/fixture-module.ts
new file mode 100644
index 0000000..75a4465
--- /dev/null
+++ b/packages/module-pack/tests/support/fixture-module.ts
@@ -0,0 +1,193 @@
+import { mkdir, mkdtemp, realpath, rm, symlink, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+/**
+ * Generated module fixtures for the packager's tests: a built module directory in a temporary
+ * location, whose `node_modules` links to the real Module SDK and Drizzle this package depends on.
+ * Everything a development module directory holds is there, including what must never ship
+ * (`src/`, `tests/`, declarations, source maps, `workspace:` ranges), so a test can prove the
+ * packager leaves it out.
+ */
+
+const packageRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..", "..");
+
+export interface FakePackage {
+  readonly name: string;
+  readonly version?: string;
+  readonly packageJson?: Record<string, unknown>;
+  /** Files relative to the fake package's root. */
+  readonly files?: Record<string, string | Uint8Array>;
+}
+
+export interface FixtureModuleOptions {
+  readonly id?: string;
+  readonly version?: string;
+  readonly serverSource?: string;
+  readonly withSchema?: boolean;
+  readonly fakePackages?: readonly FakePackage[];
+  readonly manifest?: (manifest: Record<string, unknown>) => Record<string, unknown>;
+}
+
+const temporaryDirectories: string[] = [];
+
+export async function cleanupFixtures(): Promise<void> {
+  await Promise.all(
+    temporaryDirectories
+      .splice(0)
+      .map((directory) => rm(directory, { force: true, recursive: true })),
+  );
+}
+
+export async function scratchDirectory(prefix = "ekklesia-pack-"): Promise<string> {
+  const directory = await realpath(await mkdtemp(path.join(tmpdir(), prefix)));
+  temporaryDirectories.push(directory);
+  return directory;
+}
+
+async function write(file: string, contents: string | Uint8Array): Promise<void> {
+  await mkdir(path.dirname(file), { recursive: true });
+  await writeFile(file, contents);
+}
+
+const defaultServer = (
+  id: string,
+  version: string,
+) => `import { defineModuleRuntime } from "@ekklesia/module-sdk";
+export default defineModuleRuntime({ id: ${JSON.stringify(id)}, version: ${JSON.stringify(version)}, register() {} });
+`;
+
+const schemaSource = (
+  id: string,
+) => `import { createModuleTable, defineModuleSchema } from "@ekklesia/module-sdk";
+import { text, uuid } from "drizzle-orm/pg-core";
+export const records = createModuleTable(${JSON.stringify(id)})("records", {
+  id: uuid("id").primaryKey(),
+  value: text("value").notNull(),
+});
+export default defineModuleSchema({ moduleId: ${JSON.stringify(id)}, tables: { records } });
+`;
+
+export async function fixtureModule(options: FixtureModuleOptions = {}): Promise<string> {
+  const id = options.id ?? "example";
+  const version = options.version ?? "0.1.0";
+  const root = await scratchDirectory("ekklesia-pack-fixture-");
+  const moduleDirectory = path.join(root, id);
+  const tableName = `${id.replaceAll("-", "_")}_records`;
+
+  const baseManifest: Record<string, unknown> = {
+    manifestVersion: 7,
+    id,
+    name: `${id} module`,
+    version,
+    compatibility: { platform: "^0.1.0", moduleSdk: "^0.1.0" },
+    capabilities: [],
+    permissions: [],
+    entrypoints: {
+      server: "./dist/server/index.js",
+      ...(options.withSchema ? { schema: "./dist/schema/index.js" } : {}),
+      migrations: "./drizzle",
+    },
+  };
+  const manifest = options.manifest ? options.manifest(baseManifest) : baseManifest;
+
+  await write(
+    path.join(moduleDirectory, "ekklesia.module.json"),
+    `${JSON.stringify(manifest, null, 2)}\n`,
+  );
+  await write(
+    path.join(moduleDirectory, "package.json"),
+    `${JSON.stringify(
+      {
+        name: `@test/module-${id}`,
+        version,
+        private: true,
+        type: "module",
+        scripts: { build: "tsc" },
+        dependencies: { "@ekklesia/module-sdk": "workspace:*", "drizzle-orm": "0.45.2" },
+        devDependencies: { typescript: "7.0.2" },
+        exports: { ".": "./dist/server/index.js" },
+        ekklesia: { layer: "module" },
+      },
+      null,
+      2,
+    )}\n`,
+  );
+  await write(
+    path.join(moduleDirectory, "dist/server/index.js"),
+    options.serverSource ?? defaultServer(id, version),
+  );
+  await write(path.join(moduleDirectory, "dist/server/index.js.map"), '{"version":3}\n');
+  await write(path.join(moduleDirectory, "dist/server/index.d.ts"), "export {};\n");
+  if (options.withSchema) {
+    await write(path.join(moduleDirectory, "dist/schema/index.js"), schemaSource(id));
+  }
+  await write(path.join(moduleDirectory, "src/server/index.ts"), "export {};\n");
+  await write(path.join(moduleDirectory, "tests/server.test.ts"), "export {};\n");
+  await write(path.join(moduleDirectory, "README.md"), "# Development notes\n");
+
+  await write(
+    path.join(moduleDirectory, "drizzle/0000_initial.sql"),
+    `CREATE TABLE "${tableName}" ("id" uuid PRIMARY KEY NOT NULL, "value" text NOT NULL);\n`,
+  );
+  await write(
+    path.join(moduleDirectory, "drizzle/meta/_journal.json"),
+    JSON.stringify({
+      version: "7",
+      dialect: "postgresql",
+      entries: [
+        { idx: 0, version: "7", when: 1_700_000_000_000, tag: "0000_initial", breakpoints: true },
+      ],
+    }),
+  );
+  await write(
+    path.join(moduleDirectory, "drizzle/meta/_ekklesia.json"),
+    JSON.stringify({
+      version: 1,
+      moduleId: id,
+      entries: [{ tag: "0000_initial", destructive: { mode: "none" } }],
+    }),
+  );
+  await write(
+    path.join(moduleDirectory, "drizzle/meta/0000_snapshot.json"),
+    JSON.stringify({
+      version: "7",
+      dialect: "postgresql",
+      id: "10000000-0000-4000-8000-000000000001",
+      prevId: "00000000-0000-0000-0000-000000000000",
+    }),
+  );
+
+  // The module's dependencies, as a workspace links them: the real packages this package depends on.
+  const modules = path.join(moduleDirectory, "node_modules");
+  await mkdir(path.join(modules, "@ekklesia"), { recursive: true });
+  await symlink(
+    await realpath(path.join(packageRoot, "node_modules", "@ekklesia", "module-sdk")),
+    path.join(modules, "@ekklesia", "module-sdk"),
+  );
+  await symlink(
+    await realpath(path.join(packageRoot, "node_modules", "drizzle-orm")),
+    path.join(modules, "drizzle-orm"),
+  );
+  for (const fake of options.fakePackages ?? []) {
+    const fakeRoot = path.join(modules, ...fake.name.split("/"));
+    await write(
+      path.join(fakeRoot, "package.json"),
+      JSON.stringify({
+        name: fake.name,
+        version: fake.version ?? "1.0.0",
+        type: "module",
+        main: "index.js",
+        license: "MIT",
+        ...fake.packageJson,
+      }),
+    );
+    for (const [relative, contents] of Object.entries(fake.files ?? {})) {
+      await write(path.join(fakeRoot, relative), contents);
+    }
+  }
+  return moduleDirectory;
+}
+
+export const SOURCE_REVISION = "86ae907f59458508e3277666cdd214f5bd7c1078";
diff --git a/packages/module-pack/tests/support/tar.ts b/packages/module-pack/tests/support/tar.ts
new file mode 100644
index 0000000..ba246dd
--- /dev/null
+++ b/packages/module-pack/tests/support/tar.ts
@@ -0,0 +1,62 @@
+import { gunzipSync } from "node:zlib";
+
+/** A test-side view of every ustar header field the determinism rules constrain (ADR 0049). */
+export interface TarEntry {
+  readonly path: string;
+  readonly typeflag: string;
+  readonly mode: number;
+  readonly uid: number;
+  readonly gid: number;
+  readonly uname: string;
+  readonly gname: string;
+  readonly mtime: number;
+  readonly magic: string;
+  readonly data: Buffer;
+}
+
+function text(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 octal(block: Buffer, offset: number, length: number): number {
+  return Number.parseInt(text(block, offset, length).trim() || "0", 8);
+}
+
+export function readTarGz(archive: Buffer): readonly TarEntry[] {
+  const raw = gunzipSync(archive);
+  const entries: TarEntry[] = [];
+  let offset = 0;
+  while (offset + 512 <= raw.length) {
+    const block = raw.subarray(offset, offset + 512);
+    if (block.every((byte) => byte === 0)) {
+      break;
+    }
+    const name = text(block, 0, 100);
+    const prefix = text(block, 345, 155);
+    const size = octal(block, 124, 12);
+    entries.push({
+      data: Buffer.from(raw.subarray(offset + 512, offset + 512 + size)),
+      gid: octal(block, 116, 8),
+      gname: text(block, 297, 32),
+      magic: `${text(block, 257, 6)}/${text(block, 263, 2)}`,
+      mode: octal(block, 100, 8),
+      mtime: octal(block, 136, 12),
+      path: prefix === "" ? name : `${prefix}/${name}`,
+      typeflag: text(block, 156, 1),
+      uid: octal(block, 108, 8),
+      uname: text(block, 265, 32),
+    });
+    offset += 512 + Math.ceil(size / 512) * 512;
+  }
+  return entries;
+}
+
+export function fileEntries(archive: Buffer): Map<string, Buffer> {
+  return new Map(
+    readTarGz(archive)
+      .filter((entry) => entry.typeflag === "0")
+      .map((entry) => [entry.path, entry.data]),
+  );
+}
diff --git a/packages/module-pack/tests/template-package.test.ts b/packages/module-pack/tests/template-package.test.ts
new file mode 100644
index 0000000..1d9ab1a
--- /dev/null
+++ b/packages/module-pack/tests/template-package.test.ts
@@ -0,0 +1,195 @@
+import { execFile } from "node:child_process";
+import { createHash } from "node:crypto";
+import { lstat, readdir, readFile, realpath } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { promisify } from "node:util";
+import { verifyModulePackage } from "@ekklesia/core/modules";
+import { afterEach, describe, expect, it } from "vitest";
+import { packModule } from "../src/index.js";
+import { cleanupFixtures, SOURCE_REVISION, scratchDirectory } from "./support/fixture-module.js";
+import { fileEntries } from "./support/tar.js";
+
+/**
+ * The canonical template module, packaged end to end (ADR 0049): the real built template, the real
+ * packager, and Core's real verifier. Turbo builds the template and the verifier before this suite
+ * runs (both are development dependencies of this package), and runs the template's own tests, which
+ * rebuild its UI in place, before this one (turbo.json).
+ */
+
+const execFileAsync = promisify(execFile);
+const packageRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const repositoryRoot = path.resolve(packageRoot, "..", "..");
+
+afterEach(cleanupFixtures);
+
+async function templateDirectory(): Promise<string> {
+  return realpath(path.join(packageRoot, "node_modules", "@ekklesia", "module-template"));
+}
+
+async function readJson(file: string): Promise<Record<string, unknown>> {
+  return JSON.parse(await readFile(file, "utf8")) as Record<string, unknown>;
+}
+
+async function platform() {
+  const core = await readJson(path.join(repositoryRoot, "core", "package.json"));
+  return {
+    databaseRuntime: {
+      "drizzle-orm": (core.dependencies as Record<string, string>)["drizzle-orm"] ?? "",
+    },
+    moduleSdkVersion: String(
+      (await readJson(path.join(repositoryRoot, "packages", "module-sdk", "package.json"))).version,
+    ),
+    platformVersion: String((await readJson(path.join(repositoryRoot, "package.json"))).version),
+  };
+}
+
+async function fingerprint(file: string): Promise<string> {
+  try {
+    return createHash("sha256")
+      .update(await readFile(file))
+      .digest("hex");
+  } catch {
+    return "absent";
+  }
+}
+
+async function treeListing(directory: string): Promise<readonly string[]> {
+  const entries = await readdir(directory, { recursive: true, withFileTypes: true });
+  return entries
+    .filter((entry) => !path.join(entry.parentPath, entry.name).includes(`${path.sep}node_modules`))
+    .map((entry) => path.relative(directory, path.join(entry.parentPath, entry.name)))
+    .sort();
+}
+
+async function packTemplate() {
+  const outDirectory = await scratchDirectory("ekklesia-template-package-");
+  const result = await packModule({
+    moduleDirectory: await templateDirectory(),
+    outDirectory,
+    sourceRevision: SOURCE_REVISION,
+    target: "any",
+  });
+  return { archive: await readFile(result.archivePath), result };
+}
+
+describe("the module template as a Module Package v1", () => {
+  it("packs deterministically, without touching the workspace it was built in", async () => {
+    const template = await templateDirectory();
+    const watched = [
+      path.join(repositoryRoot, "node_modules", ".pnpm-workspace-state-v1.json"),
+      path.join(repositoryRoot, "node_modules", ".modules.yaml"),
+      path.join(repositoryRoot, "pnpm-lock.yaml"),
+    ];
+    const before = await Promise.all(watched.map(fingerprint));
+    const templateBefore = await treeListing(template);
+
+    const first = await packTemplate();
+    const second = await packTemplate();
+
+    expect(first.result.sha256).toBe(second.result.sha256);
+    expect(first.archive.equals(second.archive)).toBe(true);
+    expect(path.basename(first.result.archivePath)).toMatch(
+      /^example-\d+\.\d+\.\d+-any\.tar\.gz$/u,
+    );
+    expect(await Promise.all(watched.map(fingerprint))).toEqual(before);
+    expect(await treeListing(template)).toEqual(templateBefore);
+  });
+
+  it("verifies against this platform and extracts to an unrelated directory that holds no link", async () => {
+    const { result } = await packTemplate();
+    const target = path.join(await scratchDirectory("ekklesia-installed-elsewhere-"), "example");
+    const verified = await verifyModulePackage({
+      archivePath: result.archivePath,
+      expectedSha256: result.sha256,
+      extractTo: target,
+      platform: await platform(),
+    });
+    expect(verified).toMatchObject({ moduleId: "example", target: "any" });
+
+    for (const entry of await readdir(target, { recursive: true, withFileTypes: true })) {
+      const stats = await lstat(path.join(entry.parentPath, entry.name));
+      expect(stats.isSymbolicLink(), entry.name).toBe(false);
+      expect(stats.isFile() ? stats.nlink : 1, entry.name).toBe(1);
+    }
+    const listing = await treeListing(target);
+    expect(listing).not.toContain("node_modules");
+    expect(listing.some((file) => /(^|\/)(src|tests)(\/|$)|\.d\.ts$|\.map$/u.test(file))).toBe(
+      false,
+    );
+  });
+
+  it("loads from its new location without resolving anything outside itself", async () => {
+    const { result } = await packTemplate();
+    const target = path.join(await scratchDirectory("ekklesia-portable-"), "example");
+    await verifyModulePackage({
+      archivePath: result.archivePath,
+      extractTo: target,
+      platform: await platform(),
+    });
+
+    // Every specifier the backend resolves while loading, recorded by Node itself.
+    const script = `
+      import { registerHooks } from "node:module";
+      import { pathToFileURL } from "node:url";
+      const resolved = [];
+      registerHooks({ resolve(specifier, context, next) { const result = next(specifier, context); resolved.push(result.url); return result; } });
+      for (const file of ["dist/server/index.js", "dist/schema/index.js"]) {
+        await import(pathToFileURL(${JSON.stringify(target)} + "/" + file).href);
+      }
+      process.stdout.write(JSON.stringify(resolved));
+    `;
+    const { stdout } = await execFileAsync(
+      process.execPath,
+      ["--input-type=module", "-e", script],
+      {
+        cwd: path.dirname(target),
+        env: {},
+      },
+    );
+    const resolved = JSON.parse(stdout) as string[];
+    expect(resolved.length).toBeGreaterThan(0);
+    for (const url of resolved) {
+      const inside = url.startsWith(`file://${target}/`);
+      expect(inside || url.startsWith("node:"), url).toBe(true);
+    }
+  });
+
+  it("credits every third-party package its bundles say they contain", async () => {
+    const { archive } = await packTemplate();
+    const files = fileEntries(archive);
+    const notices = files.get("example/THIRD_PARTY_NOTICES")?.toString("utf8") ?? "";
+    const bundled = new Set<string>();
+    for (const [file, data] of files) {
+      if (file.endsWith(".js")) {
+        // esbuild names every bundled source file in a path comment.
+        for (const match of data
+          .toString("utf8")
+          .matchAll(/node_modules\/((?:@[^/]+\/)?[^/.][^/]*)\//gu)) {
+          if (match[1] && !match[1].startsWith("@ekklesia/")) {
+            bundled.add(match[1]);
+          }
+        }
+      }
+    }
+    expect([...bundled]).toEqual(
+      expect.arrayContaining(["drizzle-orm", "react", "react-dom", "zod"]),
+    );
+    for (const name of bundled) {
+      expect(notices, name).toMatch(
+        new RegExp(`^${name.replace(/[.*+?^${}()|[\]\\/]/gu, "\\$&")} \\S+$`, "mu"),
+      );
+    }
+    const licence = await readFile(path.join(packageRoot, "licenses", "Apache-2.0.txt"));
+    expect(createHash("sha256").update(licence).digest("hex")).toBe(
+      "cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30",
+    );
+  });
+
+  it("refers to no absolute path of the checkout it was built in", async () => {
+    const { archive } = await packTemplate();
+    for (const [file, data] of fileEntries(archive)) {
+      expect(data.toString("utf8"), file).not.toContain(repositoryRoot);
+    }
+  });
+});
diff --git a/packages/module-pack/tsconfig.build.json b/packages/module-pack/tsconfig.build.json
new file mode 100644
index 0000000..4f5dbdb
--- /dev/null
+++ b/packages/module-pack/tsconfig.build.json
@@ -0,0 +1,14 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "declaration": true,
+    "declarationMap": true,
+    "noEmit": false,
+    "outDir": "dist",
+    "rootDir": "src",
+    "sourceMap": true,
+    "types": ["node"]
+  },
+  "include": ["src/**/*.ts"],
+  "exclude": ["src/**/*.test.ts", "tests"]
+}
diff --git a/packages/module-pack/tsconfig.json b/packages/module-pack/tsconfig.json
new file mode 100644
index 0000000..0d93162
--- /dev/null
+++ b/packages/module-pack/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../typescript-config/node.json",
+  "compilerOptions": {
+    "noEmit": true,
+    "types": ["node", "vitest/globals"]
+  },
+  "include": ["src/**/*.ts", "tests/**/*.ts"]
+}
diff --git a/packages/module-ui-build/src/build-module-ui.ts b/packages/module-ui-build/src/build-module-ui.ts
index d85298b..c9b68c9 100644
--- a/packages/module-ui-build/src/build-module-ui.ts
+++ b/packages/module-ui-build/src/build-module-ui.ts
@@ -6,7 +6,7 @@ import {
   moduleDisplayEntrypointSchema,
   packageRelativePathSchema,
 } from "@ekklesia/contracts";
-import { build, type Plugin } from "esbuild";
+import { type BuildOptions, build, type Plugin } from "esbuild";
 
 /**
  * The one supported way to turn a module's React/TSX UI sources into the compiled browser artifacts
@@ -108,7 +108,7 @@ const SURVIVING_IMPORT = /@import\s/iu;
  */
 const STYLESHEET_PLUGIN_NAME = "ekklesia-compile-stylesheet-imports";
 
-function compileStylesheetImports(): Plugin {
+function compileStylesheetImports(recordInputs?: (paths: readonly string[]) => void): Plugin {
   const decoder = new TextDecoder();
   return {
     name: STYLESHEET_PLUGIN_NAME,
@@ -127,15 +127,30 @@ function compileStylesheetImports(): Plugin {
         ],
       }));
 
+      // The nested build works from the module directory, exactly like the outer one. Without it
+      // esbuild names each stylesheet relative to whatever directory the caller ran from, and the
+      // artifact's bytes would depend on the caller (ADR 0049 requires a deterministic package).
+      const workingDirectory = pluginBuild.initialOptions.absWorkingDir ?? process.cwd();
       pluginBuild.onLoad({ filter: /\.css$/i }, async (args) => {
         const compiled = await build({
+          absWorkingDir: workingDirectory,
           bundle: true,
           entryPoints: [args.path],
           logLevel: "silent",
+          metafile: recordInputs !== undefined,
           minify: false,
           target: MODULE_UI_BUILD_TARGET,
           write: false,
         });
+        // A stylesheet's own @imports are bundled by this nested build, so the outer build never
+        // sees them. An analysis must, because they ship inside the artifact.
+        if (recordInputs && compiled.metafile) {
+          recordInputs(
+            Object.keys(compiled.metafile.inputs).map((input) =>
+              path.resolve(workingDirectory, input),
+            ),
+          );
+        }
         const stylesheet = compiled.outputFiles
           .map((outputFile) => decoder.decode(outputFile.contents))
           .join("\n");
@@ -323,6 +338,44 @@ async function resolveDeclaredArtifacts(
  * Never runs during discovery, startup, or install: this is an authoring-time and packaging-time
  * step only. Core validates the artifact a module ships; it never produces one (ADR 0021).
  */
+/** The one esbuild configuration for a declared artifact, shared by building and analysing so the
+ * two can never describe different builds. */
+function moduleUiBuildOptions(
+  moduleDirectory: string,
+  artifact: DeclaredModuleUiArtifact,
+  recordInputs?: (paths: readonly string[]) => void,
+): BuildOptions & { write: false } {
+  return {
+    absWorkingDir: moduleDirectory,
+    // Every dependency, React included, is bundled. The artifact must run in any host, including
+    // one that uses no React at all, so nothing is externalized (ADR 0023).
+    bundle: true,
+    define: {
+      // React reads this at module scope. Without it the bundle would reference `process`, a
+      // Node global that does not exist in a browser, and crash on load.
+      "process.env.NODE_ENV": '"production"',
+    },
+    entryPoints: [artifact.sourceFile],
+    // ESM only: the artifact is imported by a host with a dynamic `import()`, and the contract
+    // requires a real default export.
+    format: "esm",
+    jsx: "automatic",
+    // Unminified deliberately: an operator is expected to review the artifact they install
+    // (see docs/development/security.md), and nothing else in this repository minifies.
+    minify: false,
+    outfile: artifact.outputFile,
+    platform: "browser",
+    plugins: [compileStylesheetImports(recordInputs)],
+    sourcemap: true,
+    target: MODULE_UI_BUILD_TARGET,
+    // Fail rather than silently shipping a partial bundle.
+    logLevel: "silent",
+    // Compile every role successfully before writing any role. This makes a two-artifact build
+    // atomic with respect to parse/resolve/bundle failures rather than leaving a stale partial set.
+    write: false,
+  };
+}
+
 export async function buildModuleUi(options: BuildModuleUiOptions): Promise<ModuleUiBuildResult> {
   const moduleDirectory = path.resolve(options.moduleDirectory);
   const artifacts = await resolveDeclaredArtifacts(moduleDirectory);
@@ -330,35 +383,7 @@ export async function buildModuleUi(options: BuildModuleUiOptions): Promise<Modu
 
   for (const artifact of artifacts) {
     try {
-      const result = await build({
-        absWorkingDir: moduleDirectory,
-        // Every dependency, React included, is bundled. The artifact must run in any host, including
-        // one that uses no React at all, so nothing is externalized (ADR 0023).
-        bundle: true,
-        define: {
-          // React reads this at module scope. Without it the bundle would reference `process`, a
-          // Node global that does not exist in a browser, and crash on load.
-          "process.env.NODE_ENV": '"production"',
-        },
-        entryPoints: [artifact.sourceFile],
-        // ESM only: the artifact is imported by a host with a dynamic `import()`, and the contract
-        // requires a real default export.
-        format: "esm",
-        jsx: "automatic",
-        // Unminified deliberately: an operator is expected to review the artifact they install
-        // (see docs/development/security.md), and nothing else in this repository minifies.
-        minify: false,
-        outfile: artifact.outputFile,
-        platform: "browser",
-        plugins: [compileStylesheetImports()],
-        sourcemap: true,
-        target: MODULE_UI_BUILD_TARGET,
-        // Fail rather than silently shipping a partial bundle.
-        logLevel: "silent",
-        // Compile every role successfully before writing any role. This makes a two-artifact build
-        // atomic with respect to parse/resolve/bundle failures rather than leaving a stale partial set.
-        write: false,
-      });
+      const result = await build(moduleUiBuildOptions(moduleDirectory, artifact));
       // Belt and braces on the stylesheet contract. The plugin above turns every `.css` import into
       // JavaScript, so esbuild has nothing left to emit a stylesheet from — but a future option or
       // loader change could reintroduce a sidecar, and a sidecar is precisely the failure this
@@ -414,3 +439,71 @@ export async function buildModuleUi(options: BuildModuleUiOptions): Promise<Modu
     artifacts: Object.freeze(artifacts.map((artifact) => Object.freeze({ ...artifact }))),
   });
 }
+
+export interface ModuleUiAnalysis {
+  /** Every declared artifact, in the same stable role order `buildModuleUi` produces them. */
+  readonly artifacts: readonly ModuleUiArtifactAnalysis[];
+}
+
+export interface ModuleUiArtifactAnalysis {
+  readonly kind: ModuleUiArtifactKind;
+  readonly contributionId?: string;
+  /** Absolute path of the artifact the manifest declares. */
+  readonly outputFile: string;
+  /** Absolute paths of every source file bundled into it, stylesheets and their imports included,
+   * sorted and unique. What a packager credits for the code it redistributes. */
+  readonly inputs: readonly string[];
+  /** Whether the artifact on disk is byte-for-byte what these sources build today. False when it
+   * was never built or is stale, so a caller never describes one artifact and ships another. */
+  readonly builtArtifactCurrent: boolean;
+}
+
+/**
+ * Runs the canonical module UI build in memory, exactly as `buildModuleUi` would, and reports what
+ * went into each declared artifact. Writes nothing. Used by the module packager (ADR 0049) to find
+ * the third-party code inside already-built browser artifacts, and to refuse a stale build.
+ */
+export async function analyzeModuleUi(options: BuildModuleUiOptions): Promise<ModuleUiAnalysis> {
+  const moduleDirectory = path.resolve(options.moduleDirectory);
+  const artifacts = await resolveDeclaredArtifacts(moduleDirectory);
+  const analyses: ModuleUiArtifactAnalysis[] = [];
+  for (const artifact of artifacts) {
+    const inputs = new Set<string>();
+    let result: Awaited<ReturnType<typeof build>>;
+    try {
+      result = await build({
+        ...moduleUiBuildOptions(moduleDirectory, artifact, (paths) => {
+          for (const input of paths) {
+            inputs.add(input);
+          }
+        }),
+        metafile: true,
+      });
+    } catch {
+      throw new ModuleUiBuildError("MODULE_UI_BUILD_FAILED", artifact.kind);
+    }
+    for (const input of Object.keys(result.metafile?.inputs ?? {})) {
+      inputs.add(path.resolve(moduleDirectory, input));
+    }
+    const built = result.outputFiles?.find((outputFile) => outputFile.path === artifact.outputFile);
+    let onDisk: Buffer | undefined;
+    try {
+      onDisk = await readFile(artifact.outputFile);
+    } catch {
+      onDisk = undefined;
+    }
+    analyses.push(
+      Object.freeze({
+        ...(artifact.contributionId === undefined
+          ? {}
+          : { contributionId: artifact.contributionId }),
+        builtArtifactCurrent:
+          built !== undefined && onDisk !== undefined && Buffer.from(built.contents).equals(onDisk),
+        inputs: Object.freeze([...inputs].sort()),
+        kind: artifact.kind,
+        outputFile: artifact.outputFile,
+      }),
+    );
+  }
+  return Object.freeze({ artifacts: Object.freeze(analyses) });
+}
diff --git a/packages/module-ui-build/tests/build-module-ui.test.ts b/packages/module-ui-build/tests/build-module-ui.test.ts
index 15fa39d..1830379 100644
--- a/packages/module-ui-build/tests/build-module-ui.test.ts
+++ b/packages/module-ui-build/tests/build-module-ui.test.ts
@@ -2,7 +2,7 @@ import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import path from "node:path";
 import { afterEach, describe, expect, it } from "vitest";
-import { buildModuleUi, ModuleUiBuildError } from "../src/index.js";
+import { analyzeModuleUi, buildModuleUi, ModuleUiBuildError } from "../src/index.js";
 
 const temporaryDirectories: string[] = [];
 
@@ -502,3 +502,87 @@ describe("module UI build", () => {
     expect(artifact).not.toContain("process.env.NODE_ENV");
   });
 });
+
+describe("module UI build analysis", () => {
+  const styledSource = `import styles from "./styles.css";
+${plainUiSource.replace("const definition = {", "const definition = {\n  styles,")}`;
+
+  it("reports every source file behind each artifact, stylesheets included, and writes nothing", async () => {
+    const directory = await createModule({
+      ui: "./dist/ui/index.js",
+      files: {
+        "src/ui/index.tsx": styledSource,
+        "src/ui/styles.css":
+          '@import "./base.css";\n.example { color: var(--ekklesia-color-text); }\n',
+        "src/ui/base.css": ".example-base { margin: 0; }\n",
+      },
+    });
+    await buildModuleUi({ moduleDirectory: directory });
+    const built = await readFile(path.join(directory, "dist/ui/index.js"));
+
+    const analysis = await analyzeModuleUi({ moduleDirectory: directory });
+
+    expect(analysis.artifacts).toHaveLength(1);
+    const [artifact] = analysis.artifacts;
+    expect(artifact?.kind).toBe("ui");
+    expect(artifact?.outputFile).toBe(path.join(directory, "dist/ui/index.js"));
+    expect(artifact?.builtArtifactCurrent).toBe(true);
+    expect(artifact?.inputs).toEqual(
+      expect.arrayContaining([
+        path.join(directory, "src/ui/index.tsx"),
+        path.join(directory, "src/ui/styles.css"),
+        path.join(directory, "src/ui/base.css"),
+      ]),
+    );
+    expect([...(artifact?.inputs ?? [])]).toEqual([...new Set(artifact?.inputs)].sort());
+    // Nothing was written: the built artifact is byte-for-byte what it was.
+    expect(await readFile(path.join(directory, "dist/ui/index.js"))).toEqual(built);
+  });
+
+  it("compiles stylesheets relative to the module, whatever directory the build runs from", async () => {
+    const directory = await createModule({
+      ui: "./dist/ui/index.js",
+      files: {
+        "src/ui/index.tsx": styledSource,
+        "src/ui/styles.css": '@import "./base.css";\n.example { margin: 0; }\n',
+        "src/ui/base.css": ".example-base { margin: 0; }\n",
+      },
+    });
+    // This test runs from the package directory, never from the module's own: the artifact must
+    // still name its stylesheets relative to the module, or its bytes would depend on the caller.
+    expect(process.cwd()).not.toBe(directory);
+    await buildModuleUi({ moduleDirectory: directory });
+    const artifact = await readFile(path.join(directory, "dist/ui/index.js"), "utf8");
+    expect(artifact).toContain("/* src/ui/styles.css */");
+    expect(artifact).toContain("/* src/ui/base.css */");
+    expect(artifact).not.toContain(path.basename(directory));
+  });
+
+  it("says when a built artifact no longer matches its sources", async () => {
+    const directory = await createModule({
+      ui: "./dist/ui/index.js",
+      files: { "src/ui/index.tsx": plainUiSource },
+    });
+    await buildModuleUi({ moduleDirectory: directory });
+    await writeFile(path.join(directory, "dist/ui/index.js"), "export default {};\n");
+
+    const analysis = await analyzeModuleUi({ moduleDirectory: directory });
+    expect(analysis.artifacts[0]?.builtArtifactCurrent).toBe(false);
+  });
+
+  it("says when a declared artifact was never built", async () => {
+    const directory = await createModule({
+      ui: "./dist/ui/index.js",
+      files: { "src/ui/index.tsx": plainUiSource },
+    });
+    const analysis = await analyzeModuleUi({ moduleDirectory: directory });
+    expect(analysis.artifacts[0]?.builtArtifactCurrent).toBe(false);
+  });
+
+  it("returns an empty analysis for a backend-only module", async () => {
+    const directory = await createModule();
+    await expect(analyzeModuleUi({ moduleDirectory: directory })).resolves.toEqual({
+      artifacts: [],
+    });
+  });
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ffd7375..c2c8e85 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -196,6 +196,49 @@ importers:
         specifier: 4.1.10
         version: 4.1.10(@types/node@24.13.3)(happy-dom@20.0.11)(vite@8.1.4(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(tsx@4.23.1)(yaml@2.9.0))
 
+  packages/module-pack:
+    dependencies:
+      '@ekklesia/contracts':
+        specifier: workspace:*
+        version: link:../contracts
+      '@ekklesia/module-ui-build':
+        specifier: workspace:*
+        version: link:../module-ui-build
+      esbuild:
+        specifier: 0.28.1
+        version: 0.28.1
+      semver:
+        specifier: 7.8.5
+        version: 7.8.5
+    devDependencies:
+      '@biomejs/biome':
+        specifier: 2.5.3
+        version: 2.5.3
+      '@ekklesia/core':
+        specifier: workspace:*
+        version: link:../../core
+      '@ekklesia/module-sdk':
+        specifier: workspace:*
+        version: link:../module-sdk
+      '@ekklesia/module-template':
+        specifier: workspace:*
+        version: link:../../templates/module
+      '@types/node':
+        specifier: 24.13.3
+        version: 24.13.3
+      '@types/semver':
+        specifier: 7.7.1
+        version: 7.7.1
+      drizzle-orm:
+        specifier: 0.45.2
+        version: 0.45.2(@types/pg@8.20.0)(kysely@0.29.4)(pg@8.22.0)
+      typescript:
+        specifier: 7.0.2
+        version: 7.0.2
+      vitest:
+        specifier: 4.1.10
+        version: 4.1.10(@types/node@24.13.3)(happy-dom@20.0.11)(vite@8.1.4(@types/node@24.13.3)(esbuild@0.28.1)(jiti@2.7.0)(tsx@4.23.1)(yaml@2.9.0))
+
   packages/module-sdk:
     dependencies:
       '@ekklesia/contracts':
diff --git a/scripts/lib/build-module-package.Dockerfile b/scripts/lib/build-module-package.Dockerfile
new file mode 100644
index 0000000..97af113
--- /dev/null
+++ b/scripts/lib/build-module-package.Dockerfile
@@ -0,0 +1,31 @@
+# Builds the repository's module template and packages it with the canonical Ekklesia packager
+# (`@ekklesia/module-pack`, ADR 0049), in a clean container from a clean copy of the checkout. The
+# deploy smoke test uses it because a CI job that drives Docker has no Node.js of its own. The
+# packaging itself is exactly what a module's CI runs; this file only provides the environment.
+#
+#   DOCKER_BUILDKIT=1 docker build --file scripts/lib/build-module-package.Dockerfile \
+#     --build-arg SOURCE_REVISION=<full commit id> --output type=local,dest=<directory> .
+#
+# writes <directory>/example-<version>-any.tar.gz and its .sha256 line. No image is produced.
+#
+# The same pinned Node.js base as deploy/Dockerfile, so the package is built by the runtime it is
+# installed into.
+FROM node:24.18.0-trixie-slim@sha256:ae91dcc111a68c9d2d81ff2a17bda61be126426176fde6fe7d08ab13b7f50573 AS build
+ENV COREPACK_ENABLE_DOWNLOAD_PROMPT=0 \
+    PNPM_HOME=/pnpm \
+    TURBO_TELEMETRY_DISABLED=1 \
+    DO_NOT_TRACK=1
+WORKDIR /opt/source
+COPY package.json ./
+RUN corepack enable && corepack install
+COPY . .
+RUN --mount=type=cache,id=ekklesia-pnpm-store,target=/pnpm/store \
+    pnpm install --frozen-lockfile --store-dir /pnpm/store
+RUN pnpm exec turbo run build --filter=@ekklesia/module-template --filter=@ekklesia/module-pack
+ARG SOURCE_REVISION
+RUN test -n "$SOURCE_REVISION" && \
+    node packages/module-pack/bin/ekklesia-pack-module.mjs --module templates/module --target any \
+      --out /package --source-revision "$SOURCE_REVISION"
+
+FROM scratch AS package
+COPY --from=build /package/ /
diff --git a/scripts/lib/module-package-release.sh b/scripts/lib/module-package-release.sh
new file mode 100644
index 0000000..ae94bc1
--- /dev/null
+++ b/scripts/lib/module-package-release.sh
@@ -0,0 +1,53 @@
+# shellcheck shell=bash
+# The deploy smoke test's module package release pair (ADR 0049).
+#
+# A package archive and its `.sha256` are one logical release: they travel together, and the
+# verifier reads both. This turns one build's output into exactly that pair, in a directory any user
+# can traverse, because the verifier runs as the image's unprivileged user.
+#
+# BuildKit's local exporter creates its output directory with mode 0700, owned by whoever ran the
+# build. On a workstation that is usually uid 1000, which is also the image's `node` user, so the
+# verifier happened to read it; in CI the build runs as root, and the verifier could read neither file.
+# Nothing here depends on who built the package.
+
+# module_package_release <build output directory> <new release directory>
+#
+# Checks the build output holds exactly one archive and its digest and nothing else, and that the
+# digest line names that archive. Then creates the release directory, which must not exist yet (so an
+# earlier run's files can never be mixed in), mode 0755, and copies both files into it, mode 0644.
+# Prints the archive's file name. Fails, creating nothing, on any deviation.
+module_package_release() {
+  local output="$1" release="$2" archives=() archive digest_line digest named entries
+
+  shopt -s nullglob
+  archives=("$output"/*.tar.gz)
+  shopt -u nullglob
+  if ((${#archives[@]} != 1)); then
+    echo "module_package_release: the build output must hold exactly one package archive." >&2
+    return 1
+  fi
+  archive="$(basename -- "${archives[0]}")"
+  if [[ ! -f "$output/$archive.sha256" ]]; then
+    echo "module_package_release: the package's .sha256 is missing." >&2
+    return 1
+  fi
+  entries="$(find "$output" -mindepth 1 -maxdepth 1 | wc -l)"
+  if ((entries != 2)); then
+    echo "module_package_release: the build output holds more than the archive and its digest." >&2
+    return 1
+  fi
+  digest_line="$(<"$output/$archive.sha256")"
+  digest="${digest_line%%  *}"
+  named="${digest_line#*  }"
+  if [[ ! "$digest" =~ ^[0-9a-f]{64}$ || "$named" != "$archive" ]]; then
+    echo "module_package_release: the .sha256 line does not name this archive." >&2
+    return 1
+  fi
+
+  mkdir -m 755 -- "$release" || return 1
+  if ! install -m 0644 -- "$output/$archive" "$output/$archive.sha256" "$release/"; then
+    rm -rf -- "$release"
+    return 1
+  fi
+  printf '%s\n' "$archive"
+}
diff --git a/scripts/lib/test-module-package.Dockerfile b/scripts/lib/test-module-package.Dockerfile
deleted file mode 100644
index b05eae5..0000000
--- a/scripts/lib/test-module-package.Dockerfile
+++ /dev/null
@@ -1,50 +0,0 @@
-# TEST-ONLY. Builds the repository's module template as one self-contained installed-module directory
-# for scripts/smoke-deploy.sh, which installs it into a deployment's module storage (ADR 0048). It is
-# not a module package format and defines none: the archive format, signing, and transport of real
-# module packages are deferred. No image is produced; the build's only output is the directory:
-#
-#   DOCKER_BUILDKIT=1 docker build --file scripts/lib/test-module-package.Dockerfile \
-#     --output type=local,dest=<directory> .
-#
-# writes <directory>/example: the module's package.json, manifest, built artifacts, migrations, and a
-# node_modules holding exactly its production dependencies, including its own copies of the Module
-# SDK, the contracts, and Drizzle. Nothing in it resolves to anything outside it, because the
-# platform lends an installed module nothing.
-#
-# The same pinned Node.js base as deploy/Dockerfile, so the package targets the runtime it is
-# installed into. Drizzle comes from the platform's own lockfile, which is what keeps it the exact
-# version the platform uses: a constraint of the current implementation (ADR 0048), not a contract.
-FROM node:24.18.0-trixie-slim@sha256:ae91dcc111a68c9d2d81ff2a17bda61be126426176fde6fe7d08ab13b7f50573 AS build
-ENV COREPACK_ENABLE_DOWNLOAD_PROMPT=0 \
-    PNPM_HOME=/pnpm \
-    TURBO_TELEMETRY_DISABLED=1 \
-    DO_NOT_TRACK=1
-WORKDIR /opt/source
-COPY package.json ./
-RUN corepack enable && corepack install
-COPY . .
-RUN --mount=type=cache,id=ekklesia-pnpm-store,target=/pnpm/store \
-    pnpm install --frozen-lockfile --store-dir /pnpm/store
-RUN pnpm exec turbo run build --filter=@ekklesia/module-template
-# `--legacy` deploys from this workspace without switching it to injected workspace packages; the
-# Module SDK and every other workspace dependency are still copied into the package, built.
-RUN --mount=type=cache,id=ekklesia-pnpm-store,target=/pnpm/store \
-    set -eu; \
-    pnpm --filter @ekklesia/module-template deploy --prod --legacy --store-dir /pnpm/store \
-      /package/example; \
-    rm -f /package/example/README.md; \
-    # pnpm's hoisted self-reference points back into this workspace; an installed module has none.
-    rm -f /package/example/node_modules/.pnpm/node_modules/@ekklesia/module-template; \
-    escaping=""; \
-    for link in $(find /package/example -type l); do \
-      case "$(realpath -m "$link")" in \
-        /package/example/*) ;; \
-        *) escaping="$escaping $link" ;; \
-      esac; \
-    done; \
-    if [ -n "$escaping" ]; then echo "Links escape the package:$escaping" >&2; exit 1; fi; \
-    chmod -R a+rX,go-w /package/example; \
-    cd /package/example && node -e 'import("./dist/server/index.js").then((m) => { if (m.default.id !== "example") process.exit(1); })'
-
-FROM scratch AS package
-COPY --from=build /package/ /
diff --git a/scripts/smoke-deploy.sh b/scripts/smoke-deploy.sh
index 84277b9..73b3eb0 100755
--- a/scripts/smoke-deploy.sh
+++ b/scripts/smoke-deploy.sh
@@ -15,13 +15,15 @@
 # ADR 0048 end to end with that same image:
 #
 #   - it boots with no modules;
-#   - the repository's module template, packaged as one self-contained directory
-#     (scripts/lib/test-module-package.Dockerfile, TEST-ONLY), is installed into module storage, its
-#     migrations are planned and explicitly applied, and the API is restarted;
+#   - the repository's module template is packaged by the canonical packager as an Ekklesia Module
+#     Package v1 (ADR 0049; scripts/lib/build-module-package.Dockerfile only provides the build
+#     environment), verified by the same image's own verifier, extracted to staging, installed into
+#     module storage, its migrations planned and explicitly applied, and the API restarted;
 #   - a real headless Chromium drives the Dashboard, the module, its display, and sign-out;
 #   - the module is removed and the API restarted: Core still runs, migration planning reports the
 #     module's retained history, and its data survives;
-#   - the module is restored and the API restarted: it returns with its previous data.
+#   - the exact same package is verified and installed again, and the API restarted: the module
+#     returns with its previous data.
 #
 # EKKLESIA_SMOKE_IMAGE uses the given image instead of building one. It must be a generic image
 # (ADR 0048): modules come from module storage, never from the image.
@@ -52,6 +54,8 @@ cd "$repository_root"
 source "$repository_root/scripts/lib/compose-diagnostics.sh"
 # shellcheck source=scripts/lib/ci-project.sh
 source "$repository_root/scripts/lib/ci-project.sh"
+# shellcheck source=scripts/lib/module-package-release.sh
+source "$repository_root/scripts/lib/module-package-release.sh"
 
 for command in docker openssl awk; do
   command -v "$command" >/dev/null || {
@@ -179,7 +183,7 @@ cleanup() {
   # job itself runs as root), so only the staged copy on the Docker host needs this.
   if [[ "$daemon_work" == "$work" ]]; then
     docker run --rm --entrypoint rm -v "$work:/work" "$postgres_image" -rf /work/tls /work/env \
-      /work/modules >/dev/null 2>&1 || true
+      /work/modules /work/staging >/dev/null 2>&1 || true
   else
     docker run --rm --entrypoint rm -v /tmp:/host-tmp "$postgres_image" -rf "/host-tmp/${project}" \
       >/dev/null 2>&1 || true
@@ -213,15 +217,23 @@ if [[ -z "$image" ]]; then
 fi
 
 if [[ "$topology" == split ]]; then
-  # TEST-ONLY: the module template as one self-contained installed-module directory, built outside
-  # the platform image and installed into module storage below. Never a second platform image.
-  step "Packaging the module template as a self-contained test module"
-  DOCKER_BUILDKIT=1 docker build --quiet --file scripts/lib/test-module-package.Dockerfile \
-    --label "${EKKLESIA_CI_LABEL}=${project}" \
+  # The module template as a Module Package v1, from the canonical packager. Never a second platform
+  # image: the package is installed into module storage below, after the image verifies it.
+  step "Packaging the module template with the canonical Ekklesia packager"
+  source_revision="${GITHUB_SHA:-$(git rev-parse HEAD 2>/dev/null || true)}"
+  [[ "$source_revision" =~ ^[0-9a-f]{40}$ ]] || fail "no source revision to record in the package."
+  DOCKER_BUILDKIT=1 docker build --quiet --file scripts/lib/build-module-package.Dockerfile \
+    --label "${EKKLESIA_CI_LABEL}=${project}" --build-arg SOURCE_REVISION="$source_revision" \
     --output "type=local,dest=${work}/module-package" . >/dev/null ||
-    fail "the test module package did not build."
-  [[ -f "$work/module-package/example/ekklesia.module.json" ]] ||
-    fail "the test module package has no manifest."
+    fail "the module package did not build."
+  # The archive and its digest are one release: copied together, from this run's own build output,
+  # into a fresh directory the verifier's unprivileged user can read. BuildKit's output directory is
+  # mode 0700 and owned by whoever built it, so it is never handed to the verifier itself.
+  package_archive="$(module_package_release "$work/module-package" "$work/package")" ||
+    fail "the packager did not produce exactly one archive and its digest."
+  [[ "$package_archive" =~ ^example-[0-9]+\.[0-9]+\.[0-9]+-any\.tar\.gz$ ]] ||
+    fail "the packager produced an unexpected archive name."
+  echo "ok   packaged ${package_archive} ($(wc -c <"$work/package/$package_archive") bytes, sha256 $(cut -d' ' -f1 "$work/package/${package_archive}.sha256"))"
 fi
 
 # The compose project directory: its relative bind mount (postgres/pg_hba.conf) resolves here.
@@ -232,6 +244,13 @@ stage deploy
 # `up`: Compose refuses to start `api` or `migrate` without it, and never creates it.
 mkdir -m 755 "$work/modules"
 stage modules
+if [[ "$topology" == split ]]; then
+  stage package
+  # TEST-ONLY staging the verifier extracts into, as the image's unprivileged user. Nothing here is
+  # module storage: the install step below moves a verified tree into module storage as root.
+  mkdir -m 777 "$work/staging"
+  stage staging
+fi
 
 step "Creating the installation-private CA and server certificates"
 init_status=0
@@ -420,15 +439,27 @@ module_storage() {
     "$postgres_image" -ec "$1"
 }
 
-# install_test_module: stages the package under a hidden name, which discovery ignores, then renames
-# it into place in one step, owned by root and readable by the API's unprivileged user.
+# install_test_module: verifies the package with the generic image's own verifier, which writes the
+# verified module directory to staging, then moves it into module storage under a hidden name, which
+# discovery ignores, and renames it into place in one step, owned by root and readable by the API's
+# unprivileged user. Nothing unverified ever reaches module storage.
 install_test_module() {
-  tar -C "$work/module-package" -cf - example |
-    module_storage 'rm -rf /modules/.incoming && mkdir /modules/.incoming &&
-      tar -xf - -C /modules/.incoming && chown -R 0:0 /modules/.incoming/example &&
-      chmod -R a+rX,go-w /modules/.incoming/example &&
-      mv /modules/.incoming/example /modules/example && rmdir /modules/.incoming' ||
-    fail "the test module could not be installed into module storage."
+  local verified
+  verified="$(
+    docker run --rm --network none --read-only --tmpfs /tmp --cap-drop ALL \
+      --security-opt no-new-privileges \
+      -v "$daemon_work/package:/package:ro" -v "$daemon_work/staging:/staging" \
+      --entrypoint node "$image" core/dist/cli/verify-module-package.js "/package/${package_archive}" \
+      --sha256-file "/package/${package_archive}.sha256" --extract-to /staging/example 2>&1
+  )" || fail "the module package did not verify: ${verified}"
+  echo "ok   ${verified%%$'\n'*}"
+  docker run --rm --network none --entrypoint sh -v "$daemon_work/modules:/modules" \
+    -v "$daemon_work/staging:/staging" "$postgres_image" -ec '
+      rm -rf /modules/.incoming-example && cp -R /staging/example /modules/.incoming-example &&
+      rm -rf /staging/example && chown -R 0:0 /modules/.incoming-example &&
+      chmod -R a+rX,go-w /modules/.incoming-example &&
+      mv /modules/.incoming-example /modules/example' ||
+    fail "the verified module could not be installed into module storage."
 }
 
 # restart_api <command...>: stops the API, runs the command, and starts the API again. A controlled
@@ -590,7 +621,7 @@ if [[ "$topology" == split ]]; then
     fail "the removed module's data did not survive."
   echo "ok   the module is gone, Core runs, its history is retained, and its data survives"
 
-  step "Restoring the module and restarting: it returns with its previous data"
+  step "Reinstalling the exact same package and restarting: the module returns with its previous data"
   restart_api install_test_module
   plan="$(plan_output)"
   grep -q '^- \[applied\] example:0000_initial ' <<<"$plan" ||
diff --git a/templates/module/README.md b/templates/module/README.md
index da7d421..7d1cc67 100644
--- a/templates/module/README.md
+++ b/templates/module/README.md
@@ -55,10 +55,16 @@ To create a module inside this repository:
 
 That `modules/<module-id>` directory is where a module is **developed**. An installation never runs
 it from there: Ekklesia's image contains no modules, and an installation installs a self-contained
-copy of the module, with its own production dependencies, into its module storage
+copy of the module into its module storage
 ([An installed module is self-contained](../../docs/module-development/README.md#an-installed-module-is-self-contained),
 ADR 0048). Copying `dist/` alone is not enough, because the compiled server code imports the Module
-SDK and Drizzle by name.
+SDK and Drizzle by name. After building, package the module with the canonical packager, which
+bundles the backend into one deterministic Ekklesia Module Package (ADR 0049):
+
+```bash
+pnpm modules:pack --module templates/module --target any --out <directory> \
+  --source-revision "$(git rev-parse HEAD)"
+```
 
 The module owns its feature screens and display renderer. Do not add platform navigation, the
 containing shell, global theme, authentication screens, or top-level routing; those belong to
diff --git a/tests/ci-scripts.test.ts b/tests/ci-scripts.test.ts
index 5d986b3..e11c287 100644
--- a/tests/ci-scripts.test.ts
+++ b/tests/ci-scripts.test.ts
@@ -151,6 +151,41 @@ describe("CI scripts on a shared Docker daemon", () => {
     }
   });
 
+  it("install the smoke test's module only as a canonical package the image itself verified (ADR 0049)", async () => {
+    const deploy = (await source("scripts/smoke-deploy.sh")).replace(/\\\n\s*/gu, " ");
+    const packaging = await source("scripts/lib/build-module-package.Dockerfile");
+    expect(packaging).toContain("packages/module-pack/bin/ekklesia-pack-module.mjs");
+    expect(packaging).not.toMatch(/pnpm[^\n]*\bdeploy\b/u);
+    expect(deploy).toContain("scripts/lib/build-module-package.Dockerfile");
+    expect(deploy).toMatch(
+      /--entrypoint node "\$image" core\/dist\/cli\/verify-module-package\.js[^\n]*--sha256-file[^\n]*--extract-to \/staging\/example/u,
+    );
+    // Module storage only ever receives the verified tree from staging.
+    expect(deploy).toContain("cp -R /staging/example /modules/.incoming-example");
+  });
+
+  it("hand the verifier the package's archive and digest together, from a fresh release pair, never from build output", async () => {
+    const deploy = (await source("scripts/smoke-deploy.sh")).replace(/\\\n\s*/gu, " ");
+    expect(deploy).toContain('source "$repository_root/scripts/lib/module-package-release.sh"');
+    // The pair is made from this run's own build output, into a directory that must not exist yet.
+    expect(deploy).toContain('--output "type=local,dest=${work}/module-package"');
+    expect(deploy).toContain(
+      'package_archive="$(module_package_release "$work/module-package" "$work/package")"',
+    );
+    expect(deploy).toMatch(/^\s*stage package$/mu);
+    // BuildKit's output directory is 0700 and owned by whoever built it: it is never mounted.
+    expect(deploy).not.toContain('"$daemon_work/module-package:');
+    expect(deploy).not.toMatch(/^\s*stage module-package$/mu);
+    // The verifier reads both files from the one mount, and always checks the digest file.
+    const verifier = deploy
+      .split("\n")
+      .find((line) => line.includes("core/dist/cli/verify-module-package.js"));
+    expect(verifier).toContain('-v "$daemon_work/package:/package:ro"');
+    expect(verifier).toContain('"/package/${package_archive}"');
+    expect(verifier).toContain('--sha256-file "/package/${package_archive}.sha256"');
+    expect(verifier).not.toMatch(/--sha256\s/u);
+  });
+
   it("run every deploy smoke against the one generic image, never a second image with a module in it", async () => {
     // ADR 0048: the split topology installs its test module into module storage at run time.
     const deploy = (await source("scripts/smoke-deploy.sh")).replace(/\\\n\s*/gu, " ");
diff --git a/tests/module-package-release.test.ts b/tests/module-package-release.test.ts
new file mode 100644
index 0000000..232613d
--- /dev/null
+++ b/tests/module-package-release.test.ts
@@ -0,0 +1,127 @@
+import { execFile } from "node:child_process";
+import { chmod, mkdir, mkdtemp, readdir, readFile, rm, stat, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { promisify } from "node:util";
+import { afterEach, describe, expect, it } from "vitest";
+
+/**
+ * The deploy smoke test's release pair (ADR 0049): a package archive and its `.sha256` are one
+ * logical release and reach the verifier together, from a directory every user can traverse.
+ *
+ * The regression this exists for: BuildKit's local exporter creates its output directory with mode
+ * 0700, owned by whoever ran the build. On a workstation that is uid 1000, which is also the image's
+ * unprivileged `node` user, so the verifier could read it; in CI the build runs as root, and the
+ * verifier could read neither file ("The SHA-256 file could not be read").
+ */
+
+const execFileAsync = promisify(execFile);
+const helper = path.resolve(
+  path.dirname(fileURLToPath(import.meta.url)),
+  "..",
+  "scripts",
+  "lib",
+  "module-package-release.sh",
+);
+const archive = "example-0.1.0-any.tar.gz";
+const digest = "91e5dfee80880027bd1c2e1796513f07023c03847e9ca3870b51f8272c3accf7";
+const temporaryDirectories: string[] = [];
+
+afterEach(async () => {
+  await Promise.all(
+    temporaryDirectories
+      .splice(0)
+      .map((directory) => rm(directory, { force: true, recursive: true })),
+  );
+});
+
+/** A build output exactly as BuildKit leaves it: mode 0700, holding the archive and its digest. */
+async function buildOutput(
+  files: Readonly<Record<string, string>> = {
+    [archive]: "archive bytes",
+    [`${archive}.sha256`]: `${digest}  ${archive}\n`,
+  },
+): Promise<{ readonly root: string; readonly output: string }> {
+  const root = await mkdtemp(path.join(tmpdir(), "ekklesia-release-pair-"));
+  temporaryDirectories.push(root);
+  const output = path.join(root, "module-package");
+  await mkdir(output);
+  for (const [name, contents] of Object.entries(files)) {
+    await writeFile(path.join(output, name), contents, { mode: 0o600 });
+  }
+  await chmod(output, 0o700);
+  return { output, root };
+}
+
+async function release(output: string, target: string) {
+  return execFileAsync("bash", [
+    "-c",
+    'source "$1"; module_package_release "$2" "$3"',
+    "release",
+    helper,
+    output,
+    target,
+  ]);
+}
+
+describe("the smoke test's package release pair", () => {
+  it("copies the archive and its digest, together, into a fresh world-traversable directory", async () => {
+    const { output, root } = await buildOutput();
+    const target = path.join(root, "package");
+
+    const { stdout } = await release(output, target);
+
+    expect(stdout.trim()).toBe(archive);
+    expect((await readdir(target)).sort()).toEqual([archive, `${archive}.sha256`]);
+    expect((await stat(target)).mode & 0o777).toBe(0o755);
+    for (const name of [archive, `${archive}.sha256`]) {
+      expect((await stat(path.join(target, name))).mode & 0o777, name).toBe(0o644);
+      expect(await readFile(path.join(target, name))).toEqual(
+        await readFile(path.join(output, name)),
+      );
+    }
+  });
+
+  it.each([
+    ["the digest is missing", { [archive]: "archive bytes" }],
+    [
+      "the digest names another file",
+      { [archive]: "a", [`${archive}.sha256`]: `${digest}  other.tar.gz\n` },
+    ],
+    ["the digest is malformed", { [archive]: "a", [`${archive}.sha256`]: "not-a-digest  x\n" }],
+    [
+      "the build left something else beside the pair",
+      {
+        [archive]: "a",
+        [`${archive}.sha256`]: `${digest}  ${archive}\n`,
+        "stale.tar.gz.sha256": "x",
+      },
+    ],
+    [
+      "there is more than one archive",
+      {
+        [archive]: "a",
+        [`${archive}.sha256`]: `${digest}  ${archive}\n`,
+        "example-0.0.9-any.tar.gz": "old",
+      },
+    ],
+    ["there is no archive at all", {}],
+  ])("refuses when %s", async (_label, files) => {
+    const { output, root } = await buildOutput(files);
+    const target = path.join(root, "package");
+    await expect(release(output, target)).rejects.toThrow();
+    await expect(stat(target)).rejects.toMatchObject({ code: "ENOENT" });
+  });
+
+  it("never reuses a release directory that already exists", async () => {
+    const { output, root } = await buildOutput();
+    const target = path.join(root, "package");
+    await mkdir(target);
+    await writeFile(path.join(target, `${archive}.sha256`), `${"0".repeat(64)}  ${archive}\n`);
+
+    await expect(release(output, target)).rejects.toThrow();
+    // The stale digest is left exactly as it was; nothing was mixed into it.
+    expect(await readdir(target)).toEqual([`${archive}.sha256`]);
+  });
+});
diff --git a/turbo.json b/turbo.json
index 31b68ad..696c603 100644
--- a/turbo.json
+++ b/turbo.json
@@ -14,6 +14,10 @@
       "dependsOn": ["^build"],
       "outputs": []
     },
+    "@ekklesia/module-pack#test": {
+      "dependsOn": ["^build", "@ekklesia/module-template#test"],
+      "outputs": []
+    },
     "typecheck": {
       "dependsOn": ["^build", "^typecheck"],
       "outputs": []