Babysit a PR
Watch $ARGUMENTS — the PR for the current branch when the argument is empty — and run respond-to-review on every new round of review feedback, until the PR is approved or a round raises no new points.
The environment decides the mechanism: a watcher that wakes the session when a review lands, or a poll every five minutes. Each tick, read the reviews and comments posted since the last tick and run respond-to-review on the new findings, then end the turn with the next tick scheduled. Once the PR is approved or a round raises no new points, schedule nothing and report the outcome.