A much better options is to use docstrings[0] and a tool like doxygen to extract an API reference. Domain explanations and architecture can be compiled later from design and feature docs.
A good example of the kind of result is something like the Laravel documentation[1] and its associated API reference[2]. I don't believe AI can help with this.
[0]: https://en.wikipedia.org/wiki/Docstring
[1]: https://laravel.com/docs/12.x
[2]: https://api.laravel.com/docs/12.x/