I don't know enough about how the relevant libraries and primitives work to give your question the meaningful response it deserves. A lot of the problem here is

I don't know enough about how the relevant libraries and primitives work to give your question the meaningful response it deserves. A lot of the problem here is that most of this implementation requires me to really deeply understand the plumbing of Git in ways I currently don't. This is part of why my prototype was done with heavy assistance from agentic coding tools. I was hoping that those hard parts could be abstracted away for later with load-bearing hacks. It seems that the chickens came home to roost much faster than I expected.