Add nixos config

nix/nixos/modules/dev.nix

@@ -0,0 +1,23 @@
+{ config, pkgs, ... }:
+
+{
+  programs.direnv = {
+    enable = true;
+    enableZshIntegration = true;
+    nix-direnv.enable = true;
+  };
+
+  home.packages = with pkgs; [
+    visidata
+    bubblewrap
+
+    # TODO: Custom packages - need to verify availability or create derivations
+    # These packages were in the original configuration but may need custom setup:
+    # claude-code
+    # opencode
+    # gemini-cli
+
+    # Uncomment the above packages if they are available in your nixpkgs,
+    # or create custom derivations for them in a separate packages/ directory.
+  ];
+}