Mark Replied

Record that a human is now talking to this person, so no automated sequence ever speaks over the top of the conversation again.

Conversion Recovery Spec WS6.1. Replies land in Robbie's mailbox, which the database cannot see, so the desk records them. Writes the ci_lead_conversations suppressor the nurture sweep already gates on (the Katherine Clarke row, 2026-09-03), and optionally the opt-out list. Idempotent: registering someone twice updates last_seen.

Absence of a row here is never evidence there is no conversation; this only ever suppresses.