Add new membership responses to contact and mailing lists

Membership form responses arrive unrecorded, causing late outreach and extra billing work. Adds each submission to the live roster, contact list, and mailing audience for same-day outreach.

Overview

Untracked membership signups create late invites and billing headaches for conference planning. This flow captures every submission into the live roster, contact book, and mailing audience so membership coordinators can run segmented outreach and billing the same day.