This is really cool. I've thought about it for a long time as well but never had the idea of just using git, which is equal parts genius and "obvious" in hindsight, as most great ideas are.

I think the corollary that comes to mind is that reforms, with their git commits, are incrementally valuable if they refer to other parts of the legislation, previous commits, etc. to give more context as to the intent at the time of the law. So maybe there's a way to distill the legislative process into more PR and commit-oriented work—likely ex post as you did here, but perhaps in the future as part of an actual workflow.

And then maybe I'd pitch the idea to some technologically-inclined local government.