>Saving prompts and sessions alongside commits could become the norm for example, or I could imagine having different flags for whether a contribution was created by a human or not.

Yes, it could have syntax like

    git notes add -m "Claude prompt: foo fee faa foo" <commit-hash>

and then the tooling could attach any metadata to it that is desired.

OH WAIT YOU CAN DO THAT ALREADY SINCE 2009

Seriously, the 90% complaints about git not being able to do something is just either RTFM or "well, it can, but could use some better porcelain to present to user"