Built the #NKBIP-04 directory system into GRW and it's actually pretty cool.

Took all day to define, tho. Simple structure, but highly-complex behavior. Don't worry, documented it in Gherkin, so it should be easy to copy.

But, yes, that's literally #NostrUNIX

Felt cute, so I added the #NKBIP-03 citation events, as well.