This isn't needed at all. If "AI" is half as good as we're reliably inform it is, "AI" can write anything you want in any language or combination of languages you want. It's got near infinite short term memory, no 5+-2 working memory limit, no cognitive biases, and it's the worst it's ever going to be.

Straight up imperative language programming would work. No need for crutches like object orientation, structured programming etc etc. Probably no need for any methodology. LLMs can't stand up, as it were, so agile isn't helpful.