feat: Module Package v1 carries the module's own license (ADR 0051)

Every Module Package v1 now declares the module's license and carries its
text. packageFormat stays 1; pre-ADR-0051 metadata fails closed.

- Contracts: ekklesia.package.json requires an SPDX `license` expression,
  validated with spdx-expression-parse, with UNLICENSED and non-expressions
  refused. The `files` list must hold exactly one non-empty root LICENSE.
  The package contracts move to the @ekklesia/contracts/module-package
  subpath, so the SPDX parser and its data (spdx-exceptions and
  spdx-license-ids ship no licence files) never reach a module bundle
  through the SDK's re-export of the contracts root.
- Packager: reads the source package.json's string SPDX declaration and
  never invents one. It requires an explicit --license-file (a non-empty
  regular file, no symlink, no parent search, no download) and copies its
  bytes unchanged to LICENSE, listed with size and SHA-256 and covered by
  the archive digest. THIRD_PARTY_NOTICES stays third-party only, and
  bundled Ekklesia code stays in `incorporates`.
- Verifier: rejects missing or invalid license metadata, and a missing,
  unlisted, duplicated, or corrupted LICENSE, through the schema and the
  existing strict inventory.
- Template: packaged as AGPL-3.0-or-later with the repository's canonical
  LICENSE, passed explicitly (Dockerfile, smoke, docs). Packing it twice
  gives byte-identical archives.

Started by Codex; reviewed and completed in Claude Code (empty license-text
refusal, schema non-empty LICENSE, symlink and empty-file tests).

ADR 0051 is Accepted.

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

packages/module-pack/tests/cli.test.ts

@@ -13,11 +13,14 @@ describe("ekklesia-pack-module arguments", () => {
         "any",
         "--out",
         "dist/packages",
+        "--license-file",
+        "LICENSE",
         "--source-revision",
         revision,
       ]),
     ).toEqual({
       moduleDirectory: "templates/module",
+      licenseFile: "LICENSE",
       outDirectory: "dist/packages",
       sourceRevision: revision,
       target: "any",
@@ -33,6 +36,8 @@ describe("ekklesia-pack-module arguments", () => {
         "any",
         "--out",
         "out",
+        "--license-file",
+        "LICENSE",
         "--source-revision",
         revision,
         "--repository",
@@ -44,6 +49,10 @@ describe("ekklesia-pack-module arguments", () => {
   it.each([
     ["no arguments", []],
     ["a missing target", ["--module", ".", "--out", "o", "--source-revision", revision]],
+    [
+      "a missing license file",
+      ["--module", ".", "--target", "any", "--out", "o", "--source-revision", revision],
+    ],
     ["a missing revision", ["--module", ".", "--target", "any", "--out", "o"]],
     [
       "an unknown option",