Add incoming signups to weekly SMS reminder campaign

Webhook signups arrive unenrolled, leaving recipient records incomplete and SMS reminders unsent. Enroll contacts and start the SMS reminder so coordinators can send next-week topics same week.

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Overview

When webhook signups aren't enrolled, coordinators scramble before the delivery window and reminders get missed. This flow creates or updates contact records and enrolls them in the SMS reminder so messages go out reliably ahead of next week's send.