heya, i don't know of any terminal-based hypermedia, but that's an interesting concept

maybe gopher as a prototype example?

adam stepinski (creator of hyperview) is one of the heroes of hypermedia in that he didn't just develop a hypermedia format but also developed a hypermedia client, and you need both for a proper hypermedia system

so, I would say... maybe you are lookin' at the person in the mirror who is going to make that terminal app hypermedia?