Even with humans out of the loop you will still want features like branches, pull requests, tags/versioning, build reproducibility, etc.

A pull request could be a special case of some other construct?

All the others seem necessary. Maybe you don't need branches at all, of course we do! Things have to have names.

	▲	fasterik 7 minutes ago \| parent [-]
		Technically, I guess you could say that a pull request is not a part of a version control system. GitHub has pull requests, but they're not a primitive in git, they're built on top of branches, commits, and merge/rebase. That said, I would expect a version control system built around agentic workflows to have something like it as a core feature.