Shepherd an emule PR to mergeable

The job: take an open PR and get it ready to land — review it against the repo ethos, confirm every review comment is actually resolved, fix what's still wrong, rebase onto origin/main locally, and hand the developer a change+verification summary (with a drafted per-point comment) to review and push. The PR author's later commits usually claim to have addressed the review ("Address review …"); an automated reviewer (Copilot) and a human reviewer have usually weighed in. None of that is trustworthy on its own.

Human-in-the-loop for the push. The skill rebases and prepares, but it does not force-push the author's branch or post the comment on its own — force pushing a shared branch rewrites someone else's history and is a human decision. The deliverable is a rebased local branch plus a summary the developer signs off on before pushing.