pr-status and pr-merge both computed 'latest non-comment review verdict per
reviewer' independently (identical oldest-first, COMMENT/PENDING-skipping,
supersede-by-later loop). Extract it to a shared verbs::latest_reviews helper
so the verdict semantics live in one place and can't drift between the
health view and the pre-merge changes-requested gate. Pure dedup, no
behaviour change.
f633abbdc4