[Pavilion-devs]

Summary

• promotes https://getsamaritan.xyz as Samaritan's canonical public judge URL
• updates README, architecture, release scope, claims matrix, winning plan, and submission draft
• keeps the platform deployment URL out of judge-facing copy

Verification

• apex and www are registered to the existing read-only Sites deployment
• Vercel remains authoritative DNS only; no application or credentials moved to Vercel
• apex and www custom-hostname and SSL status are active
• forced-edge checks return 200 for the app, Proof, judge evidence, and TXLine pulse
• judge evidence remains no-login/paper-only; the pulse remains derived-only with seven fields
• repository changes are documentation-only and git diff --check passes

No product, risk, execution, evidence, or data-disclosure boundary changes in this PR.