feat(goose-cli): add package and update configurations

- Added `goose-cli` package definition and metadata in `unstable` overlay.
- Updated `default.nix` under `aarch64-darwin` to include `goose-cli` in system packages.
- Removed commented out packages and cleaned up unused lines for better clarity and maintainability.

systems/aarch64-darwin/m4/default.nix

@@ -2,7 +2,6 @@
 
 with lib.metacfg;
 {
-
   homebrew = {
     enable = true;
     brews = [
@@ -29,8 +28,6 @@ with lib.metacfg;
   };
 
   environment.systemPackages = with pkgs; [
-    # iterm2
-    # azure-cli
     kubectl
     kubectx
     k9s
@@ -44,6 +41,8 @@ with lib.metacfg;
     qemu
     claude-code
     nodejs
+    goose-cli
+    aider-chat
   ];
 
   users.users.harald.shell = pkgs.fish;