Start a self-guided takedown on a match: opens an enforcement attempt the user works through manually, using the match's possible next steps as the guide; notolens never submits or sends anything itself. Requires an open match (inbox or watching); a closed match errors. Starting moves the match to in_takedown and arms recurring record refreshes so a subject that stays up keeps being probed; it stays in_takedown until the attempt closes or the match is resolved or dismissed. Safe to repeat: an already-open takedown is returned with created=false. add_takedown_event records work performed, update_takedown closes the attempt, and get_match_evidence provides the PDF to attach when filing.