- Added a comprehensive plan for history rewrites in `docs/plans/history_rewrite.md`, including backup requirements and a checklist for destructive operations.
- Created a QA report for history-rewrite scripts in `docs/reports/qa_report.md`, summarizing tests, findings, and recommendations.
- Introduced `check_refs.sh` script to list branches and tags, saving a tarball of tag references.
- Updated `clean_history.sh` to include non-interactive mode and improved error handling for backup branch pushes.
- Enhanced `preview_removals.sh` to support JSON output format and added shallow clone detection.
- Added Bats tests for `clean_history.sh` and `validate_after_rewrite.sh` to ensure functionality and error handling.
- Implemented pre-commit hook to block commits to `data/backups/` directory.
- Improved validation script to check for backup branch existence and run pre-commit checks.
- Created temporary test scripts for validating `clean_history.sh` and `validate_after_rewrite.sh` functionality.
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