self-review
Before the review
You shouldn't fetch GitHub review suggestions or start to do code change at first. The first task for you is to understand the PR's movitation and design direction.
You can read the PR description, original commit and diff, make sure you completely understand the goal the PR makes. Breaking changes bourdary and features that are explicitly postponed.
If you are in a loop, or in a goal mode, you should storage all these things, make sure you can still remember them during your sessions. Keep them in mind.
Handle the review
When you are required to resolve Codex's review, you are basically in a loop. I'm not sure where is the start of the loop, maybe you will find users already called @codex review for you. And you should continue this loop unless users tell you only fix one turn.