A closed row is corrected by withdrawing its resolution and resolving the
subject again at the next sequence; admission already allows it, in one batch
too (new test). The refusal gave no way to find it: a Mind that tried to
Withdraw or re-resolve the follow-up itself got AlreadyResolved with only the
subject. It now carries closed_by, the resolution key to withdraw.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>