perfex-module-dev

Use whenever the user is creating, modifying, or debugging a Perfex CRM module — anything under `modules/<module_name>/` including `module_name.php`, `install.php`, `uninstall.php`, controllers extending `AdminController` or `ClientsController`, models extending `App_Model`, views, language files, asset registration, or menu items via `app_menu->add_sidebar_menu_item`. Trigger when user says "new Perfex module", "register a module", "activation hook", "Perfex admin menu", or mentions `register_activation_hook` / `register_deactivation_hook` / `register_uninstall_hook`. Covers Perfex module lifecycle, CI3 controller conventions, and the Linux production case-sensitivity trap.