cross-check-review-findings

Verify new code review findings — this session's review or ones pasted from parallel agents — against a pull request's head, cross-check the confirmed ones against the PR's existing review feedback, keep only findings that are new or materially add to existing ones, and draft a concise PR review response. Use after reviewing a PR, or when asked to check findings against existing PR comments, drop findings reviewers already raised, or draft a PR review from findings. Takes a PR number or URL. Does not perform the review, fix code, or post anything without approval.