Add dnouri/pi-coding-agent as an Emacs frontend for the pi coding agent.
Pinned to commit 8d8158b.
- Package installed from GitHub with all .el files (includes md-ts-mode)
- Suppress grammar auto-install prompt since tree-sitter grammars are
already managed by Nix (treesit-grammars.with-all-grammars)
- Keybinding: SPC o p to launch pi-coding-agent
- Alias: M-x pi as shortcut for M-x pi-coding-agent