I think the connection is already there! You can access iSH files in the Files app and move them freely to and from iCloud.
You're right! This is beautiful!
Have you used iVim[1]?
I tried out iVim for a few hours. It has vimrc support and integration with the files app. It also integrates with The blink shell app so that you can edit files on remote through vim and ssh
Are there any plans to build some kind of connection between the filesystem here and the native ios filesystem-thingy? It would be delightful to be able to edit something in real vim and then save it to icloud...