Shepherd

The stage after Build. /shepherd <pr-ref> owns one pull request from open to ready to merge: it waits for the review bot's round to finish, triages every outside comment as a thread, and acts — fixed through a fresh builder and crucible, answered with evidence, put to the operator when a colleague wrote it, or escalated when it changes the spec. It never merges.

Outside review is input, never a second gate. The bot's findings and colleagues' comments enter as threads to triage; crucible stays the only gate each fix passes, and the score the bot carries is a signal, not proof — a colleague has already shown it wrong.

The operator starts it in a fresh session — on the pull request /build hands back, or on any other.

What the run carries