Archive a completed change. Checks completion, syncs features to living documentation, then moves to archive. When it runs: after and before the PR or merge, on whatever branch the change lives on (normally the worktree branch created). The archive is the last commit on that branch and ships in the same PR as the code, so never carries an active directory for a feature that has already landed. Archive itself hands off to the merge/PR step (step 7) — it is never something to do after the PR is merged. Archive never creates or switches branches: if the user is on the base branch, archive there…