It sounds like the author went through a lot of pain to avoid using git+lfs or perforce.

I use git+lfs for unity projects and it works out great. If I had a real studio I'd buy some perforce seats.

Reinventing the wheel like this is quite exhausting. There are options that are proven to work. AI authorship does not fundamentally violate the idea of some thing owning a specific commit. We don't need new schemas in our source control system. "Provenance" is a bullshit word used to make the AI sound like it's some kind of oracular source with superhuman capabilities.