+devshell structure

shells/default.nix

@@ -0,0 +1,36 @@
+# Development shells for various programming environments
+# Each shell can be accessed via: nix develop .#<shell-name>
+# Or used in home-manager/system configs
+{pkgs}: {
+  # Default shell for working on this repository
+  default = pkgs.mkShell {
+    name = "m3ta-nixpkgs-dev";
+
+    buildInputs = with pkgs; [
+      nil # Nix LSP
+      nixpkgs-fmt # Nix formatter
+      nix-tree # Explore dependency trees
+      statix # Nix linter
+      deadnix # Find dead Nix code
+    ];
+
+    shellHook = ''
+      echo "🚀 m3ta-nixpkgs development environment"
+      echo "Available commands:"
+      echo "  nix flake check    - Check flake validity"
+      echo "  nix flake show     - Show flake outputs"
+      echo "  nix build .#<pkg>  - Build a package"
+      echo "  nixpkgs-fmt .      - Format Nix files"
+      echo "  statix check .     - Lint Nix files"
+      echo "  deadnix .          - Find dead code"
+    '';
+  };
+
+  # Import all individual shell environments
+  rust = import ./rust.nix {inherit pkgs;};
+  python = import ./python.nix {inherit pkgs;};
+  nodejs = import ./nodejs.nix {inherit pkgs;};
+  go = import ./go.nix {inherit pkgs;};
+  web = import ./web.nix {inherit pkgs;};
+  devops = import ./devops.nix {inherit pkgs;};
+}