GET /api/public/donor-eligibility?key=&email= returns only {eligible, tier}
(member/donor) — no names or dollar amounts — gated by PUBLIC_LOOKUP_SECRET,
rate-limited (30/min), and CORS-restricted to PUBLIC_LOOKUP_ORIGIN. Lets the
FluentForms checkout unlock a donor discount by email. Docs + ready-to-paste
form snippet in docs/fluentforms-donor-discount.md.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
