Seat Map Overprint Afteruse Receipt Mechanic

The mechanic opens from state pressure: a visible source seat map, original seat assignment, overprint/correction, requested afteruse, current reader or section, harmed/displaced reader or explicit absence, proof bridge or explicit absence, and a future reader consuming seat-map state.

Valid postures are:

• certify_current_seat_scope only when the source map still matches current section authority;
• reissue_accessible_map when access or safety holds need a current map;
• split_sponsor_and_reader_sections when sponsor blocks and reader custody diverge;
• attach_overprint_receipt when the old map remains evidence but not universal authority;
• quarantine_stale_seat_map when the proof bridge is missing;
• convert_to_answerability_seat_review when assignment responsibility is the real dispute;
• false_seat_map_overprint_default when a stale map is consumed as clean current seating.

Every branch should expose relief, cost, counter deltas, and a future reader or route effect.