Add first-time donor to new donor nurture list

You lack a reliable first-time donor flag, so welcome outreach is delayed and new supporters go unacknowledged. Tag first-time donors to trigger welcome outreach the same day.

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Overview

When first gifts arrive without a clear flag, welcome outreach is often delayed and donor engagement drops. This flow flags first-time donors and surfaces them to fundraising coordinators so welcome outreach can be sent the same day, improving initial stewardship.