v0.8.0

Improvements

• Garbage collection now bounds its root set using gc.retain (default 30d), allowing content abandoned by rewrites (amend/rebase/drop/squash) to be reclaimed after the retention window while always retaining anything reachable from branch refs.
• sdt gc now trims expired moments as part of collection (when not running with --dry-run), preventing old moment logs from pinning otherwise unreachable objects.
• Moment log trimming is more robust: when the only surviving keyframe would be cut, remaining moments are re-anchored so trimming can proceed without breaking reconstruction.

Breaking Changes

• Updated package version to 0.8.0.