VSCode extension marketplace doesn't have the best security rails or reputation for security, and with this being closed source, just personally, installing and running it on my machine isn't something I'm comfortable doing.
> The idea is that CodeViz can replace or augment search and directory tree by providing a more intuitive interface for navigation!
That to me is a different goal than the one in your post (maybe it's just phrasing or I didn't understand the OP correctly), and is something I'd be excited to have!
> ideally the definition of an architecture diagram would be rigorous enough that there is no ambiguity
Rigor is a big "if" in software ;). See: UML's attempt. C4 is some very loose guidelines. IIRC, a big part of its attraction is the lack of rigor/formal standards.
Anyway, best of luck! Feel free to reach out if you'd like to chat diagrams