Delete a checklist

Permanently removes a checklist and all of its items. The deletion is logged on the attached event's change history when applicable.

Required permission: assigned_event_write (when the authenticated user is assigned to the checklist's event) or unassigned_event_write (otherwise). Staff users without admin role also need the per-checklist allow_staff_edit flag. Customers cannot delete checklists. User-checklists (personal task lists) cannot be deleted via the API — they are singletons that recreate themselves on next access.