Address follow-up bundle review feedback

Make offline catalog coverage content-agnostic and require autonomous catalog commits to include the assisted-by trailer.

Assisted-by: GitHub Copilot (model: GPT-5.6 Sol, autonomous)

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: fbe794bc-667a-4c9e-b48b-825067debc6d

Author: BenBtg

.github/workflows/add-community-bundle.lock.yml

@@ -261,6 +261,12 @@ changes, list the validation results, include
 `Closes #${{ github.event.issue.number }}`, and mention the submitter with
 `cc @<issue-author>`.
 
+End the commit message with this authorship trailer:
+
+```text
+Assisted-by: GitHub Copilot (model: <name-if-known>, autonomous)
+```
+
 ## Important Rules
 
 - Modify only `bundles/catalog.community.json` and

.github/workflows/add-community-bundle.md

@@ -36,12 +36,17 @@ def test_builtin_community_catalog_resolves_from_packaged_snapshot_offline():
     source = _src(
         "community",
         "builtin://community",
-        priority=2,
+        priority=20,
         policy="discovery-only",
     )
+    payload = fetcher(source)
     stack = CatalogStack([source], fetcher)
 
-    assert stack.search() == []
+    assert isinstance(payload.get("bundles"), dict)
+    assert all(
+        result.source.id == "community" and not result.install_allowed
+        for result in stack.search()
+    )
     assert stack.sources[0].install_allowed is False