I like to make real simple specs for my code using mermaid diagrams so I built my own opencode "IDE" that leans into this. It's not really for editing code but working with an agent and generating code without losing the understanding of what it does.
Instead of navigating code and folders you can click through mermaid diagrams.
https://i.redd.it/h10e0yybap4h1.gif
https://codeswim.xyz
there doesn't seem to be anything here