This particular feature which lets you write instructions/notes as code comments is most relevant https://aider.chat/docs/usage/watch.html
Back when I wrote https://github.com/hiAndrewQuinn/shell-bling-ubuntu LazyVim seemed to provide the simplest out of the box experience for getting Copilot up, but I'm not sure if it has continued going down that path.. It's been a minute since I've used it in anger. Maybe Lazy has already added Avante and I'm just not aware of it?
$ codellm -root /path/to/root -prompt - -connect $addr
^D
Then it would be trivial to adapt to anything, e.g. as :'<,'>!codellmMan all these wrappers and proxies that do the same thing again and again only to bury the essence.