feat(perf): Add get_ui_performance AI tool

tests/test_mcp_perf_tool.py

@@ -0,0 +1,32 @@
+import unittest
+from unittest.mock import MagicMock
+import mcp_client
+
+class TestMCPPerfTool(unittest.TestCase):
+    def test_get_ui_performance_dispatch(self):
+        # Mock the callback
+        mock_metrics = {
+            'last_frame_time_ms': 16.6,
+            'fps': 60.0,
+            'cpu_percent': 15.5,
+            'input_lag_ms': 5.0
+        }
+        mcp_client.perf_monitor_callback = MagicMock(return_value=mock_metrics)
+        
+        # Test dispatch
+        result = mcp_client.dispatch("get_ui_performance", {})
+        
+        self.assertIn("UI Performance Snapshot:", result)
+        self.assertIn("last_frame_time_ms: 16.6", result)
+        self.assertIn("fps: 60.0", result)
+        self.assertIn("cpu_percent: 15.5", result)
+        self.assertIn("input_lag_ms: 5.0", result)
+        
+        mcp_client.perf_monitor_callback.assert_called_once()
+
+    def test_tool_spec_exists(self):
+        spec_names = [spec["name"] for spec in mcp_client.MCP_TOOL_SPECS]
+        self.assertIn("get_ui_performance", spec_names)
+
+if __name__ == '__main__':
+    unittest.main()