chore: ruff check

- Added support for 'At' message components in long-term memory, allowing for better representation of mentions in messages.

astrbot/core/agent/mcp_client.py

@@ -345,6 +345,9 @@ class MCPClient:
 
     async def cleanup(self):
         """Clean up resources including old exit stacks from reconnections"""
+        # Set running_event first to unblock any waiting tasks
+        self.running_event.set()
+
         # Close current exit stack
         try:
             await self.exit_stack.aclose()
@@ -356,9 +359,6 @@ class MCPClient:
         # Just clear the list to release references
         self._old_exit_stacks.clear()
 
-        # Set running_event first to unblock any waiting tasks
-        self.running_event.set()
-
 
 class MCPTool(FunctionTool, Generic[TContext]):
     """A function tool that calls an MCP service."""