Add workshop registrants to central attendee tracking sheet

You get registration webhooks without a central attendee record, causing prep gaps and duplicate outreach. Keep the attendee sheet current so coordinators finish prep before each session.

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Overview

When registrations arrive as raw webhooks, your coordinators often miss adding them to the roster, which leads to last-minute scramble before sessions. This flow captures each signup into your master sheet and flags duplicates so coordinators have an accurate attendee list within minutes.