It's possible to do a large amount of AI-assisted work, then do a second/third/fourth pass to break it up into a reviewable stack of self-contained PRs. But it takes time, and there's no such thing as one-shotting it. And it's basically impossible to continuously rebase manually without burning tokens. The way to merge the stack is more-or-less "stop the world".

However, I have yet to see how this will play out with upstream contribs:

https://github.com/moment/luxon/discussions/1796

https://github.com/leeoniya/luxon/tree/leeoniya/perf-patches...