fix: preserve real cancellation in MCP paths

nanobot/agent/loop.py

@@ -81,6 +81,7 @@ from nanobot.session.manager import (
     replay_max_messages_for_context,
 )
 from nanobot.triggers.local_turns import LocalTriggerTurnCoordinator
+from nanobot.utils.cancellation import task_is_cancelling
 from nanobot.utils.document import extract_documents, reference_non_image_attachments
 from nanobot.utils.helpers import image_placeholder_text
 from nanobot.utils.helpers import truncate_text as truncate_text_fn
@@ -998,8 +999,11 @@ class AgentLoop:
                 except asyncio.CancelledError:
                     # Preserve real task cancellation so shutdown can complete cleanly.
                     # Only ignore non-task CancelledError signals that may leak from integrations.
-                    if not self._running or asyncio.current_task().cancelling():
+                    if not self._running or task_is_cancelling():
                         raise
+                    logger.warning(
+                        "Ignoring leaked CancelledError while consuming inbound messages"
+                    )
                     continue
                 except Exception as e:
                     logger.warning("Error consuming inbound message: {}, continuing...", e)