Add scheduled repository cleanup workflow

manifest.json

@@ -12,6 +12,7 @@
     "Update README.md whenever blueprint.md or blueprint.json changes.",
     "Update docs/security-review.md during release-readiness work.",
     "Update docs/release-checklist.md when release behavior changes.",
+    "Add or preserve non-destructive scheduled repository cleanup checks for active projects.",
     "Run git diff --check before finishing.",
     "Run the cheapest reliable verification command or document why it could not run.",
     "After pushing workflow-triggering commits, poll Gitea workflow runs until success or a concrete blocker."
@@ -27,6 +28,18 @@
       "AI instruction injection scan"
     ]
   },
+  "cleanupAutomation": {
+    "workflow": "files/repo-cleanup-gitea.yml",
+    "target": ".gitea/workflows/repo-cleanup.yml",
+    "schedule": "weekly",
+    "checks": [
+      "tracked generated files",
+      "large tracked files",
+      "secret-prone local config files",
+      "stale branch candidates"
+    ],
+    "destructive": false
+  },
   "readmeDivider": {
     "templateName": "section-line",
     "source": "https://raw.githubusercontent.com/andreasbm/readme/master/assets/lines/rainbow.png",
@@ -108,6 +121,11 @@
       "source": "files/security-scan-gitea.yml",
       "target": ".gitea/workflows/security-scan.yml",
       "required": false
+    },
+    {
+      "source": "files/repo-cleanup-gitea.yml",
+      "target": ".gitea/workflows/repo-cleanup.yml",
+      "required": false
     }
   ],
   "placeholders": [