- Update duroxide dependency from 0.1.20 to 0.1.21
- Add orphan QueueMessage drop logic: events enqueued before orchestration
  starts are dropped (orchestration_name == "Unknown", empty history,
  all-QueueMessage batch); other work items kept for retry
- Enable test_orphan_queue_messages_dropped validation test
- Add sample_config_hot_reload_persistent_events_fs e2e test
- Apply cargo fmt formatting

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>