Potential fix for pull request finding 'Empty except'

Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com>

Author: YunchuWang

examples/on_demand_sandbox/remote_worker.py

@@ -26,4 +26,5 @@ def _remote_hello(ctx: task.ActivityContext, name: str) -> str:
     try:
         threading.Event().wait()
     except KeyboardInterrupt:
+        # Expected on Ctrl+C: exit loop and let the context manager stop the worker gracefully.
         pass