No, you have to manually document them and then the docs go out of date and you can't realistically set up CI for this little runner script so certain use cases get broken and blah blah blah and it sucks!

Same for runtime.sh.

This is why the 'runtime run source' is so useful! I'm totally on board with it. I just don't think we need one implementation per ecosystem.

One runner per project (the 'make run' approach) is worse than one per ecosystem, which is in turn worse than just having one for everything!