I like git-notes (https://git-scm.com/docs/git-notes) for this sort of annotations and context. It's a nice balance - adjacent to commits, follows branch structure, easy to instrument, doesn't muddy the commit history.
Being able to stick a bit of directive text somewhere durable at any point in time has been surprisingly convenient for steering LLMs, as well.
Being able to stick a bit of directive text somewhere durable at any point in time has been surprisingly convenient for steering LLMs, as well.