world.event is a control-channel notification (AWP-EVT-001, AWP-EVT-003). Standard events: entity_appeared, entity_removed, collision, e_stop_engaged, e_stop_released, envelope_violation, grant_expired, safe_state_entered, safe_state_exited, channel_degraded, world_resetting, world_shutdown. Every event carries status_seq, shared with action.status (AWP-CTL-008), so events order against action transitions and replay on session.resume:
awp:world-event
text/event+json observation channel is a frame channel like any other: its frames carry seq and ts_mono_ns, obey the channel’s loss class, and hold the world’s own structured samples — detections, scene deltas, game state — under a schema the manifest declares. It never carries the events above.