docs(x402): add AgentScrape as real-world example service

[hshintelligence]

What this PR does

Adds AgentScrape as a real, live, production x402 service in the AgentKit x402 action provider's README.

Why

The existing README's registeredServices example uses placeholder URLs (https://api.example.com, https://weather.x402.io) that aren't reachable production x402 endpoints. Developers reading the README to learn how to wire up x402 in AgentKit benefit from a real, copy-pasteable URL that actually returns 402 Payment Required and works end-to-end on Base mainnet.

Changes

• Replaced placeholder URLs in the X402Config example with AgentScrape's real worker URL
• Added a Real-World Example Services section linking to AgentScrape's manifest, A2A card, and source code, with a complete x402ActionProvider config snippet

About AgentScrape

• Live: https://agent-scrape.healingsunhaven.workers.dev
• License: MIT (open source)
• Network: Base mainnet (eip155:8453)
• Asset: USDC
• Free tier: 10 calls per wallet in first 30 days
• Six tools: scrape, extract (Groq + Llama 4), screenshot, metadata, session, workflow
• Standards: x402 v2, MCP Streamable HTTP, A2A Agent Card, OpenAPI 3.1, Schema.org JSON-LD, IPFS-pinned manifest
• Listings: Glama (License A / Quality A), Smithery (82/100), punkpeye/awesome-mcp-servers (merged), mcp.so

Happy to address any feedback, scope back the change, or split into separate commits if preferred.

[cb-heimdall]

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