Babysit a PR

This skill is a loop around desplega:tackle-gh-comments. Each round does these steps:

1. Read the PR state.
2. Fix what is wrong.
3. Push one time.
4. Re-trigger the reviewers.
5. Wait for the next event.

The loop stops when the PR is clean on its head commit, at the round limit, or when a decision belongs to the user.

Loop contract

A turn in a babysit run ends in exactly one of two ways: