Production example: regime / pre-action x402-proxy (Entropy Index)

Hi — we deployed the x402-proxy pattern in production and would love to be a non-toy example in the template README or CF Agents docs (regime / pre-action intelligence — not weather, not RPC).

**Live Worker (Check-only at edge, Base USDC $0.07):**
https://entropy-x402-proxy.entropyindex.workers.dev/api/v1/risk/taiwan?depth=probe

**Health:**
https://entropy-x402-proxy.entropyindex.workers.dev/__x402/health

**Behavior:**
- Unpaid GET → HTTP 402 + x402 v2 PAYMENT-REQUIRED (Base USDC, eip155:8453)
- Paid GET → proxied to origin with internal key (no double-402)
- Higher tiers (The Call $5 / The Book $8) stay on www — edge is Check-only

**Agent discovery:**
https://www.entropyindex.com/llms.txt
https://www.entropyindex.com/.well-known/x402.json

Happy to provide copy, screenshots, or a short blurb for the template README / charge-for-http docs.

Taylor Good · taylor@entropyindex.com · https://www.entropyindex.com

Review the template README and CF Agents docs to identify the appropriate example section. Use the provided live Worker, health, and agent-discovery links to document the production x402-proxy example, its Check-only behavior, and payment flow. Done means the example and links are added in the selected documentation location.

Written by the indexing model from the issue text.