resolveReceivers passed the slug as both `sourceRef` AND `lastName`, so
an unresolved receiver "smith-john" became a provisional Person with
lastName="smith-john" — a regression of the existing senderName→Person
contract.
Fix: zip the parallel `receiver_person_ids` and `receiver_names`
columns by position (the normalizer emits them 1:1 like
sender_person_id/sender_name). When the names list is shorter than the
slugs list, fall back to slug-as-name for the missing entries.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
535594378a