chore: apply ruff auto-fixes and remove dead AST scripts

tests/test_headless_verification.py

@@ -1,11 +1,9 @@
 from typing import Any
 import pytest
-from unittest.mock import MagicMock, patch, call
-from models import Ticket, Track, WorkerContext
+from unittest.mock import MagicMock, patch
+from models import Ticket, Track
 import multi_agent_conductor
 from multi_agent_conductor import ConductorEngine
-import ai_client
-import json
 
 @pytest.mark.asyncio
 async def test_headless_verification_full_run(vlogger) -> None:
@@ -121,7 +119,7 @@ async def test_headless_verification_error_and_qa_interceptor(vlogger) -> None:
   vlogger.log_state("T1 Initial Status", "todo", t1.status)
   
   # Patch engine used in test
-  with patch("multi_agent_conductor.run_worker_lifecycle", wraps=multi_agent_conductor.run_worker_lifecycle) as mock_worker_wrap:
+  with patch("multi_agent_conductor.run_worker_lifecycle", wraps=multi_agent_conductor.run_worker_lifecycle):
    await engine.run()
   
   vlogger.log_state("T1 Final Status", "todo", t1.status)