fix: add fallback cleanup when event loop is not running

Added else branch to handle edge case where loop exists but is not running. Uses asyncio.run() as fallback to ensure cleanup happens even if the loop was stopped externally or due to an error.

Author: Sourabsb

core/framework/runner/mcp_client.py

@@ -420,6 +420,13 @@ def disconnect(self) -> None:
 
                 # Now stop the event loop
                 self._loop.call_soon_threadsafe(self._loop.stop)
+            else:
+                # Fallback: loop exists but not running (e.g., due to error or external stop)
+                # Use asyncio.run() to execute cleanup in a new event loop
+                try:
+                    asyncio.run(self._cleanup_stdio_async())
+                except Exception as e:
+                    logger.warning(f"Error during fallback async cleanup: {e}")
 
             # Wait for thread to finish
             if self._loop_thread and self._loop_thread.is_alive():