Same as any other software team? You keep an eye on all PRs, dive deep on areas you know to be sensitive, and in general mostly trust till there's a bug or it's proven itself to need more thorough review.

I've only ever joined teams with large, old codebases where most of the code was written by people who haven't been at the company in years, and my coworkers commit giant changes that would take me awhile to understand so genAI feels pretty standard to me.