Unfortunately. It's a great solution to a problem lots of tools face. A pity that people trying to establish new standards aren't aware of it aparently.

I'm a little disappointed there's no standard for /.well-known/list that points to things made available under /.well-known/ on that domain.

Doesn't need to be everything, just ones you want discoverable. Only other way to do it is trying every one you know.

Good idea actually. You could just make /.well-known an index page