refactor: notebook configration

hosts/nb/modules/development/coding.nix

@@ -0,0 +1,10 @@
+{ config, pkgs, ... }:
+let
+  # unstable = import (fetchTarball https://nixos.org/channels/nixos-unstable/nixexprs.tar.xz) {
+  #   config = { allowUnfree = true; };
+  # };
+in {
+  environment.systemPackages = with pkgs; [
+    claude-code
+  ];
+}