{
  "track_id": "concurrent_tier_source_tier_20260302",
  "type": "refactor",
  "status": "new",
  "created_at": "2026-03-02T22:30:00Z",
  "updated_at": "2026-03-02T22:30:00Z",
  "description": "Replace ai_client.current_tier global state with threading.local() for parallel agent safety."
}