docs(referrals): retire Form C plan and document existing hosted workflow

www/README.md

@@ -580,6 +580,15 @@ npm run audit:links
 
 The live crawl is optional and may fail in restricted network environments.
 
+## Referral CTA
+
+The public `/referrals` page preserves the existing site's **Refer a Client**
+button, linking directly to https://form.jotform.com/231638510219149. The
+site does **not** embed a referral form or require Form C. This destination is
+separate from Form A's 16 allowlisted placements. Legacy-hosted-form privacy,
+recipient, accessibility and operational acceptance remain the owner's release
+responsibility.
+
 ## Forms
 
 As of the owner decision on 2026-10-30, `npm run dev` and `npm run build`