fix(#1498): regenerate capability-registry.cjs in npm version lifecycle hook (#1499)

* fix(#1498): regenerate capability-registry.cjs in npm version lifecycle hook

The version npm lifecycle script now runs gen-capability-registry.cjs --write
after sync-manifest-versions.cjs stamps all capability/*.json version fields.
Without this, every npm version X.Y.Z call left capability-registry.cjs stale
(capability JSONs got the new version string, but the registry still embedded
the old ones), causing gen-capability-registry.cjs --check to fail in the RC
test suite.

- package.json version script: add gen-capability-registry --write + git add
- tests/issue-844-manifest-version-sync.test.cjs: regression guard (describe F)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix: backfill changeset pr: 1499

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -86,7 +86,7 @@
     "gen:capability-registry": "node scripts/gen-capability-registry.cjs --write",
     "prepack": "npm run build:lib",
     "prepare": "npm run build:lib",
-    "version": "node scripts/sync-manifest-versions.cjs --stage",
+    "version": "node scripts/sync-manifest-versions.cjs --stage && node scripts/gen-capability-registry.cjs --write && git add gsd-core/bin/lib/capability-registry.cjs",
     "prepublishOnly": "npm run build:lib && npm run build:hooks",
     "pretest": "npm run build:lib && npm run lint:skill-deps",
     "pretest:coverage": "npm run build:lib && npm run lint:skill-deps",