I'm working on Relay [0] -- a collaboration plugin for Obsidian using yjs to provide live cursors and folder sync.
I'm currently thinking about how to robustly Integrate different edit sources like iCloud, obsidian sync, git, and yjs updates. I think it could be cool to create a crdt persistence format that can live alongside markdown files (like note.md + note.md.crdt) to support edit history tracking from multiple users and their devices.