Fixes counterexamples 1-4 from specs/orchestrator.qnt: a repeated
'approve', 'approve rev-1' meant for the architecture, approving on both
channels, and 'approve' plus an afterthought all landed on the next
plan, one the operator had not seen.
- Revisions are numbered across the work item (A4 already required
monotonic tags; the code numbered per gate), so rev-N names one plan.
- Each reply is stamped on arrival with the revision that was up: in
Matrix the one whose approval request had been sent (a plain value
the transport thread reads, restored on boot), in Gitea the latest
plan comment older than the reply (board.posts).
- Gate.evaluate applies a reply that names no revision only if its stamp
is the current revision. Otherwise an approval is not applied and
feedback rejects nothing (it is still in the transcript), and the
agent says which revision is up. 'approve rev-N' binds by its number.
- Spec A4 states both rules. The model applies them; scenarios 1-4 now
expect the properties to hold, and both held over 200,000 random
traces and Apalache's exhaustive check to depth 8.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE
