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

tests/test_live_gui_integration.py

@@ -1,11 +1,10 @@
 from typing import Generator
 import pytest
-from unittest.mock import MagicMock, patch, AsyncMock, ANY
+from unittest.mock import patch, ANY
 import asyncio
 import time
 from gui_2 import App
 from events import UserRequestEvent
-import ai_client
 
 @pytest.fixture
 def mock_app() -> Generator[App, None, None]:
@@ -94,7 +93,7 @@ def test_user_request_error_handling(mock_app: App) -> None:
     """
  app = mock_app
  with (
-  patch('ai_client.send', side_effect=Exception("API Failure")) as mock_send,
+  patch('ai_client.send', side_effect=Exception("API Failure")),
   patch('ai_client.set_custom_system_prompt'),
   patch('ai_client.set_model_params'),
   patch('ai_client.set_agent_tools')