Workflow: Cleanup Merged Branch

Announce at start: "I'm using the workflow-cleanup-merged skill to clean up after the merged PR."

When to Invoke

• After the user has confirmed a PR is merged on GitHub.
• Invoked by /swe-workbench:cleanup-merged (user-triggered, one-off cleanup).
• Invoked by Mode C orchestration (orchestration.md) at Step 7, after each merge round.

Never auto-trigger. Cleanup is user-initiated or orchestrator-initiated. Do not attach to a Stop hook.

What This Skill Does NOT Do

• Does not merge PRs — that is the user's action.
• Does not force-delete branches with uncommitted work — no --force, ever.
• Does not squash, rebase, or alter commit history.
• Does not bypass branch protection rules.
• Does not verify CI status — CI verification happens in Phase 3/4 before the PR is created.