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

tests/test_api_events.py

@@ -36,20 +36,7 @@ def test_event_emission() -> None:
  callback.assert_called_once_with(payload={"data": 123})
 
 def test_send_emits_events() -> None:
- with patch("ai_client._send_gemini") as mock_send_gemini, \
- patch("ai_client._send_anthropic") as mock_send_anthropic:
-  mock_send_gemini.return_value = "gemini response"
-  start_callback = MagicMock()
-  response_callback = MagicMock()
-  ai_client.events.on("request_start", start_callback)
-  ai_client.events.on("response_received", response_callback)
-  ai_client.set_provider("gemini", "gemini-2.5-flash-lite")
-  ai_client.send("context", "message")
-  # We mocked _send_gemini so it doesn't emit events inside. 
-  # But wait, ai_client.send itself emits request_start and response_received?
-  # Actually, ai_client.send delegates to _send_gemini. 
-  # Let's mock _gemini_client instead to let _send_gemini run and emit events.
-  pass
+ pytest.fail("TODO: This test is mocked incorrectly and asserts nothing. Use _proper version below.")
 
 def test_send_emits_events_proper() -> None:
  with patch("ai_client._ensure_gemini_client"), \
@@ -72,7 +59,6 @@ def test_send_emits_events_proper() -> None:
   assert kwargs['payload']['provider'] == 'gemini'
 
 def test_send_emits_tool_events() -> None:
- import mcp_client
  with patch("ai_client._ensure_gemini_client"), \
  patch("ai_client._gemini_client") as mock_client, \
  patch("mcp_client.dispatch") as mock_dispatch: