- mirror_refs.sh: additive branch+tag mirroring between dadeschools (HTTPS)
and prgs (SSH:2222). Dry-run default, --apply to execute, --force for
diverged branches. Uses bare repo cache for isolation.
- test_mirror_refs.py: flag parsing, safety defaults, brace-delimited refspec
validation, and local bare-repo integration tests (FF detection, branch/tag
comparison).
- README.md: document mirror_refs.sh, test suite, and multi-instance auth.
