feat(registry): hard-cut META_REPO -> REGISTRY_REPO; wire mirror into startup/webhook/sweep

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

backend/tests/test_propose_vertical.py

@@ -55,6 +55,24 @@ class FakeGitea:
         self._pr_counter = 0
         self._commit_counter = 0
         self._seed_repo("wiggleverse", "meta")
+        # §22 M3: the deployment's project registry. Startup refresh_registry
+        # reads projects.yaml here; the single 'default' project's content_repo
+        # points back at the seeded meta repo so the corpus mirror is unchanged.
+        self._seed_repo("wiggleverse", "registry")
+        self.files[("wiggleverse", "registry", "main", "projects.yaml")] = {
+            "content": (
+                "deployment:\n"
+                "  name: Test Deployment\n"
+                "  tagline: A test deployment\n"
+                "projects:\n"
+                "  - id: default\n"
+                "    name: Test Deployment\n"
+                "    type: document\n"
+                "    content_repo: meta\n"
+                "    visibility: public\n"
+            ),
+            "sha": "regsha0001",
+        }
 
     def _seed_repo(self, owner, repo):
         self.branches[(owner, repo)] = {"main": {"sha": "initial", "ts": "2026-05-23T00:00:00Z"}}
@@ -431,7 +449,7 @@ def tmp_env(monkeypatch):
         "GITEA_BOT_USER": "rfc-bot",
         "GITEA_BOT_TOKEN": "bot-token",
         "GITEA_ORG": "wiggleverse",
-        "META_REPO": "meta",
+        "REGISTRY_REPO": "registry",
         "OAUTH_CLIENT_ID": "cid",
         "OAUTH_CLIENT_SECRET": "csec",
         "APP_URL": "http://localhost:8000",