Monday: worktree audit Skill

[proerror77]

Parent

#639

What to build

Add a read-only Skill that reuses the repository worktree preflight report to classify active, dirty, and prunable entries without deleting or cleaning anything.

Acceptance criteria

• The Skill invokes or follows the existing preflight report and verifies branch, HEAD, ownership, dirty state, push/PR state, and active use before classification.
• The Skill never removes worktrees or branches and requires explicit authorization for cleanup.
• Official Skill validation and a focused smoke check pass.

Blocked by

None - can start immediately

[proerror77]

Completion evidence

Acceptance checks: PR #643 merged as bbeb592; monday-worktree-audit passed official validation; repository preflight smoke reported 65 active, 4 dirty, and 0 Git-prunable without mutation; all required CI passed and review threads were resolved.
Result: passed