migrated all languages to devshell

modules/dev/julia.nix

@@ -1,15 +1,32 @@
 {
+  config,
   lib,
   pkgs,
-  config,
   ...
 }:
+let
+  packages = builtins.attrValues {
+    inherit (pkgs) julia; # High-performance dynamic language for technical computing
+  };
+in
 {
-  options.my.dev.julia.enable = lib.mkEnableOption "enable";
-
+  options = {
+    my.dev.julia.enable = lib.mkEnableOption "Install Julia globally";
+    devShells.julia = lib.mkOption {
+      type = lib.types.package;
+      default = pkgs.mkShell {
+        inherit packages;
+        name = "julia-dev-shell";
+        shellHook = ''
+          echo "🔬 Julia dev environment"
+        '';
+      };
+      description = "Julia development shell";
+    };
+  };
   config = lib.mkIf config.my.dev.julia.enable {
-    users.users.jawz.packages = builtins.attrValues {
-      inherit (pkgs) julia;
+    users.users.jawz = {
+      inherit packages;
     };
   };
 }