Push-channel hook fired by the dispatcher’s MAM_Pn_Sender. The legacy mam_push_notification_manager bridges to MAM_PushDispatcher. Sibling plugins normally don’t fire this directly — use mam_notification_send_message and let the dispatcher route.

Every form-manager hook in firing order: signature, when it fires, expected return shape, real example. Plus the $local_app_form_array global and the option-key conventions that glue the system together.