Cut claimable's Mind-wide stop on any follow-up question and queue's inline
blocked loop. queue::on_hold is the one reader of what an in-force question
holds (a question raised in a run holds that run's claims, anything else holds
itself); queue, inbox::derive and the open_and_launch gate read it.
Breaker::Trip names the newest ended counted run; the breaker question is
raised in that run; the boundary is the newest of a question raised in the item
and a run claiming it that a question is raised in, so an answer or withdrawal
gives every claim of the run a fresh count. The trip and the held-brief wait
are written to the heartbeat trace.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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