Diff vs git ref

Scan the current working tree AND a historical git ref, then show what changed structurally: added/removed files, new/resolved issues, edge churn, metric deltas. The PR-review companion.

Absolute path. Must already exist on disk and be a git repository.
Any branch, tag, or commit SHA in the repo above. Remote refs (e.g. origin/main) need git fetch to be run first. The scan uses git worktree add — your working tree is not touched.