Review comments have a way of arriving right when you've moved on to something else. Somebody flags an edge case, and it sits there until you circle back — if you remember to.
Set a Watcher agent on a pull request and it'll notice new comments the moment they land, then hand them to an Addresser agent that verifies each one against the real code, fixes what's actually true, and pushes an update — all before you've opened the tab yourself.
You still make the final call. But the gap between "someone left feedback" and "someone looked at it" shrinks from hours to minutes.