vp-git

Validates git rebase correctness using a five-layer pipeline (range-diff, sem, weave, jscpd, tests). Use when verifying a git rebase (especially stacked PRs with --update-refs), comparing branches post-rebase, or auditing conflict resolution correctness. Covers scenarios like: 'validate rebase', 'check rebase', 'did we lose anything', 'compare before and after rebase', 'duplicate test blocks', 'rebase validation', 'run range-diff', 'lost code during rebase', 'rebase artifacts', 'conflict resolution verification'.

Safely propagate a base-branch commit through all descendant branches in a stacked-PR chain. Handles safety-tagging, `git rebase --update-refs --empty=drop` from the tip, conflict-resolution heuristics, dependency-drift recovery, and `--force-with-lease` push. Use when landing a fix on an upstream branch in a stack and the descendants must be rebased. Covers scenarios like: 'cascade through the stack', 'rebase pr6..pr13 onto the new pr5', 'land on the base and propagate', 'update the descendant branches', 'restack onto the new base', 'force-with-lease the whole stack', 'fix the base and roll the stack forward'. Pairs with `/rebase-validate` for post-cascade meaning-preservation check.

Triage and prune accumulated git safety tags using sort-by-SHA grouping and a per-tag decision tree (duplicate / branch-ref / intermediate-waypoint). Read-only by default; deletes only after explicit user confirmation. Use when stacked-rebase or surgical-fix sessions have accumulated multiple safety tags across namespaces (safety/*, pre-*, post-*, backup-*, stack-*), when /stack-cascade's Step 2 collision check blocks reuse of an OP_ID, or when auditing inherited tag soup. Pairs with /stack-cascade as post-success aftercare. Covers scenarios like: 'clean up safety tags', 'too many backup tags', 'prune accumulated tags', 'tag audit', 'tag-audit', 'safety tag cleanup', 'rollback anchor cleanup', 'which tags can I delete', 'tag namespace collision', 'OP_ID already has tags'.