Log evicted WebSocket close errors instead of silently swallowing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: dsarno

Server/src/transport/plugin_hub.py

@@ -584,8 +584,8 @@ async def _evict_connection(cls, session_id: str, reason: str) -> None:
         if websocket is not None:
             try:
                 await websocket.close(code=1001)
-            except Exception:
-                pass
+            except Exception as close_ex:
+                logger.debug("Error closing evicted WebSocket for session %s: %s", session_id, close_ex)
 
         if cls._registry is not None:
             try: