Review 5631: record harness revalidation
Review 5631: record restack revalidation
Review 5631: record Round 7 exact-head approval
Review 5631: record Round 6 delivery
Review 5631: round 6 mutation coverage
Review 5631 round 5: atomic claim test gap
Review 5631 round 4: reconcile wall time
Review 5631 round 4: record exact-head CI
Review 5631 round 4: current-current wait cycle
Review 5631 round 3: late-arrival queue deadlock
Review #5631 round 2: record post-review CI signal
Review #5631 round 2: retain one rollout owner
Update PR 5631 post-review checks
Record review for PR 5631