Add Block Lottos referral program

[scosemicolon]

Summary

• Adds Block Lottos as an agent-friendly Polygon referral programme.
• Focuses on the affiliate/referral and API surfaces, not lottery promotion.
• Includes AI-agent guidance to avoid claims about winnings or wallet signing.

Verification

• https://blocklottos.com/affiliate is public.
• https://blocklottos.com/llms.txt, https://blocklottos.com/agents.txt, and https://blocklottos.com/openapi.json return HTTP 200.
• Added one YAML registry file under programs/.

[vercel]

@scosemicolon is attempting to deploy a commit to the affitor Team on Vercel.

A member of the Team first needs to authorize it.