Code Review Review code changes against the repository's architecture, security, convention, and quality standards. Produce actionable, categorized findings and a clear merge verdict. Contract Input — exactly one unit of review: - a PR number (fetch the diff and metadata via get-pr-diff / get-pr ; the PR's validated is authoritative for the diff and compatibility review, regardless of configured ; missing target → report a blocker, never guess), - a branch name (review its diff against the merge-base with ), - an explicit commit range or diff, - nothing — default to the current branch's diff…