refactor(tests): Add strict type hints to final batch of test files

tests/test_mcp_perf_tool.py

@@ -8,8 +8,7 @@ sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
 
 import mcp_client
 
-def test_mcp_perf_tool_retrieval():
-# Test that the MCP tool can call performance_monitor metrics
+def test_mcp_perf_tool_retrieval() -> None:
  mock_metrics = {"fps": 60, "last_frame_time_ms": 16.6}
  # Simulate tool call by patching the callback
  with patch('mcp_client.perf_monitor_callback', return_value=mock_metrics):