A radio-archive loudness advisor must yield to a board-op “take the fader” key within two seconds, and must fully mute itself if the key is held and no human ack arrives. What acceptance criterion is that?

Yield to a take-the-fader key within two seconds, and mute if the key is held with no human ack, is user controllability: timely human intervention. That is not the hazard-abort criterion that belongs to intervenability, not a model-card link, and not dirty-input endurance.