pr-review-validator: done waits for every auto-reviewer to settle on the head SHA

A cycle running before the bots posted saw zero findings and reported done;
with a fast-green CI the babysit loop could exit unreviewed. done now needs
every reviewer settled for the current head: Copilot's verdict review
(commit_id), Codex's verdict comment (Reviewed-commit line), its thumbs-up
reaction on the PR body, or the named claude-review check run — with quota/
error notices and the reaction freshness-gated on push time (check-suite
creation, not committer date) and every lookup paginated. pr-babysit re-arms
with backoff on a pending reviewer instead of exiting unactionable, skipping
the pointless final-cycle wait.

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