pm-dispatch(sign-off): a seat going off shift hands every unlanded claimed card back to pm:queue in one stroke; a needs_decision card goes to the decision box; stay-behind narrows to ACCEPTed PRs waiting on the queue or a human

pm-dispatch(sign-off): a seat going off shift hands every unlanded claimed card back to pm:queue in one stroke; a needs_decision card goes to the decision box; stay-behind narrows to ACCEPTed PRs waiting on the queue or a human #2963