Cleaning Commit History

Clean up messy git histories into logical commit sequences that are easy to review and maintain.

VCS Detection

Check which VCS to use first:

jj root 2>/dev/null && echo "USE_JJ=true" || echo "USE_JJ=false"

If jj is available, prefer jj commands -- they're non-interactive and the oplog provides automatic safety (no manual backup branch needed).

Operating Procedure

Phase 0: Safety

Git: Create backup branch before any surgery: