This thing already exists for multiple years - see https://deepwiki.com/ (99% it is autonomous, but it can be manually structured - see https://docs.devin.ai/work-with-devin/deepwiki#steering-deep...). There were also multiple attempts to replicate it with local LLMs.

The problem is that it is still a slop: not only it adds a lot of noise ("architecture" diagrams based on some cherry-picked filenames, incomplete datatables, hyperfocusing on strange things), it also hallucinates, adding factually incorrect information (while direct questions to LLM shows correct information).