Explore directory process

Hi everyone :) I was dealing with implementing directory discovery in dart_wot lately and I was wondering a bit about how exactly the process should work here:

1. Is the directory URL supposed to be the directory's Thing Description? Or is it supposed to point to a resource related to the things property of the directory?
2. In the case that the URL is supposed to point to the TDD's Thing Description, should the implementation first consume the TD and then read the things property? Or is this implementation-specific?

Sorry if the answer to these questions should be obvious, unfortunately, I haven't really been able to follow the discussions in the TF in detail for the last couple of months :/ In any case: Thank you! :)

Originally posted by @JKRhb in https://github.com/w3c/wot-scripting-api/issues/364#issuecomment-1554391976

Start with the two directory-URL and Thing Description questions in this issue, then read the linked discussion in w3c/wot-scripting-api#364. Resolve whether discovery consumes the directory Thing Description and reads its things property; done means the expected process is agreed for dart_wot implementers.