docs(x402): add TWZRD Agent Intel as example Solana x402 MCP service

[twzrd-sol]

Summary

Adds TWZRD Agent Intel to the x402 action provider README as an example of a live Solana-native x402 MCP server.

Why this fits:

• x402 action provider already supports solana-mainnet / solana-devnet (in SUPPORTED_NETWORKS) and @x402/svm — TWZRD Agent Intel is a concrete live service that exercises this Solana path
• TWZRD is the first Solana-native x402 MCP server using the twzrd.receipt.v5 signed trust token format
• Provides a real-world example developers can drop into registeredServices when building Solana-capable agents

Service details:

• URL: https://intel.twzrd.xyz/mcp
• Protocol: x402 v2 on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp (Solana mainnet)
• Payment: USDC on Solana (<1s settlement)
• 4 free tools: score_wallet, get_agent_profile, check_trust_level, list_top_agents
• Paid tool: get_trust_receipt — returns signed twzrd.receipt.v5 trust token via HTTP 402
• MCP Registry: xyz.twzrd.intel/twzrd-agent-intel

Quickstart with this provider:

const provider = x402ActionProvider({
  registeredServices: ["https://intel.twzrd.xyz"],
  allowDynamicServiceRegistration: false,
});

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[cb-heimdall]

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