This is the answer, and it has been the answer going back to the before times when we didn't have pull requests but we did in-person team code reviews before me

This is the answer, and it has been the answer going back to the before times when we didn't have pull requests but we did in-person team code reviews before merging branches (yes, really). A massive, complicated merge without documentation and extensive support from other interested/impacted people and teams justifying things like a parser DSL? That is always going to be a problem whether AI generated it or the developer locked their office door and went on a three-day manic coding binge. AI doesn't directly make this stuff worse, it accelerates a team's journey towards embracing engineering practices around the code being written by humans or LLMs.