List Segment Builder Turns the user's own list/CRM/GA4/ecommerce export into behavioral segments (engaged-90d, cart-abandoners), attribute and RFM tiers, lifecycle-stage segments (new, active, lapsed, win-back), and a suppression list (unsubscribed, hard-bounced, spam-complained, consent-withdrawn). It defines who each segment is and who must never be mailed — email-creative-builder and email-sequence-designer then compose for those segments; this skill does not send, design flows, or score the program. Quick Start Skill Contract Expected output : a segment map in four buckets — (1) behaviora…