chore: update MANIFEST.json with commit hash for T-002

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

Author: homeofe

.ai/handoff/MANIFEST.json

@@ -11,7 +11,7 @@
     "duration_minutes": 5,
     "session_id": "eslint-setup",
     "phase": "maintenance",
-    "commit": "",
+    "commit": "54bbf76",
     "timestamp": "2026-02-27T14:00:00.000Z"
   },
   "tasks": {