Add cohort delivery tag to new membership signups

When webhook signups arrive without cohort context, your membership records stay unsegmented and deliveries stall. You get correctly tagged members ready for cohort delivery within minutes.

Overview

Unsegmented signups force program coordinators to scramble and delay content delivery; tagging at ingestion fixes that operational gap. This flow applies cohort tags instantly so coordinators see ready-to-deliver groups within minutes, keeping launches on schedule.