PERMANENTLY deletes a project and everything in it: saved keywords, rank trackers and their history, site audits, leads, brand tracking, and its Search Console connection. Cannot be undone. Only call this after the user has explicitly asked to delete this specific project by name; if they may want the data later, tell them to archive it from the dashboard instead. Pass the project's exact name as confirmName — a mismatch refuses the delete. Returns the deleted {id, name}.