Session Handoff [auto-2731]: Deduplicate pr_review.py wait's Liveness Triple and Held Q_FULL Read (#2731) #2733

Next steps, in priority order

1. Fix Deduplicate pr_review.py wait's Liveness Triple and Its Back-to-Back Held Q_FULL Reads #2731 in scripts/pr_review.py wait. Done looks like both of the issue's items landed on develop through a feature pull request whose body carries Closes on promotion: #2731:
   • One pure helper, taking the payload and min_rounds, computes the liveness triple (head_review_done, answered_outside_review, reviewer_login_drift), and both main's first Q_LIVE evaluation and live_state call it, so the first stop decision and every later one read the same conditions.
   • A held wait opens its poll on the snapshot it already read rather than a second back-to-back Q_FULL read, with the held-wait tests that count reads updated to the new count.
2. Run the script's test suite and the hub's full local gate set, then local-strict-review, before the push.

External blockers

None known at pick time.

Internal dependencies

• Step 1's helper must keep every stop reading main and live_state take today. The issue's risk is a reading present at one site and missing from the other, so a test asserting both sites reach the same stop decision on the same payload guards the refactor.
• The read-count change and the held-wait test updates land together, since the tests count reads.

State

• Picked by an unattended-handoff picker, scope develop. No branch, worktree, or pull request exists for this lane yet.
• Share One Bounded Backoff Loop Between pr_review.py wait's Two Polls #2732, merged to develop and not yet promoted, introduced live_state and the shared backoff loop this fix builds on, and it names Deduplicate pr_review.py wait's Liveness Triple and Its Back-to-Back Held Q_FULL Reads #2731 only as filed along the way.
• Re-derive from origin/develop before editing, since pr_review.py changes often.

The parked decision queue

None. Count 0.

What the last round did

Nothing on this lane. This is its first link.

What not to repeat

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New learnings

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