Ah.  I figured out why I didn't use `repo_file` here in the first place: it takes an implicit argument (which I love) of `@repo`, for "the current repository".  Since we don't create a repository for the microkernel, this means we have to do something super-ugly (eg: support passing in a second argument to override the repo name lookup) to use that method here.

In templates, of course, no problem: that data was already extracted just fine.  I might be able to get at the repo digging around enough, but it doesn't feel worth it compared to just asking for the file.  Thoughts?