Ah, getting AI to do that part of the work… hasn’t worked for me. The only thing that it’s been helpful for in that regard is as a rubber duck, which isn’t much. But honestly, the built-in refactoring tools in an IDE are more consistent.

How’s your test coverage? Good E2E tests that treat the codebase like a black box will help a lot, however you approach the actual refactoring. That might conceivably also be something the AI could help you with.