- Refactored `scripts/review_pull_requests.py` to use `git for-each-ref` with the `ahead-behind` atom (Git 2.41+) for bulk metadata retrieval.
- Reduced Git subprocess calls from O(N) to O(1) in the branch gathering phase.
- Implemented a `BRANCH_METADATA_CACHE` to provide a fast path for branch metadata retrieval, avoiding redundant `git log` calls.
- Added a Git version check with a robust fallback to the original logic for compatibility with older environments.
- Expanded branch scanning to all `refs/remotes` to handle multiple remotes.
- Maintained data parity by ensuring `get_branch_info` still returns the last 5 commit subjects.
- Achieved a measurable performance improvement, reducing execution time from ~0.6-1.4s to ~0.47s in the current environment.
