fix(gateway): tolerate cancelled channel tasks during shutdown

nanobot/channels/manager.py

@@ -252,6 +252,10 @@ class ChannelManager:
             try:
                 await channel.stop()
                 logger.info("Stopped {} channel", name)
+            except asyncio.CancelledError:
+                if asyncio.current_task() and asyncio.current_task().cancelling():
+                    raise
+                logger.debug("Channel {} stop task was already cancelled", name)
             except Exception:
                 logger.exception("Error stopping {}", name)
 

nanobot/channels/websocket.py

@@ -827,6 +827,10 @@ class WebSocketChannel(BaseChannel):
         if self._server_task:
             try:
                 await self._server_task
+            except asyncio.CancelledError:
+                if asyncio.current_task() and asyncio.current_task().cancelling():
+                    raise
+                self.logger.debug("server task was already cancelled during shutdown")
             except Exception as e:
                 self.logger.warning("server task error during shutdown: {}", e)
             self._server_task = None