Add LogicNodes integration example for PydanticAI

[cmdenney]

Add LogicNodes MCP integration example

Adds a single optional example file showing how to connect this framework to LogicNodes — deterministic on-chain verification, identity, and compliance for autonomous agents. Zero core runtime changes.

What is LogicNodes?

LogicNodes provides 2,300+ cryptographically-signed deterministic microservices for autonomous agents, callable via MCP or direct REST:

Service	Endpoint	Description
Gas oracle	POST /call/gas-oracle	EIP-1559 gas estimates with verifiable signatures
Compliance sentry	POST /call/compliance-sentry	On-chain regulatory & constitutional checks
ZK attestation	POST /x402/zk-attest	Proof-of-existence anchored to Base L2
Trust graph	GET /graph/score/{agent_id}	Counterparty reputation from on-chain history
ETH price	GET /call/eth-price	Signed ETH/USD price oracle

Integration

pip install mcp  # Python
npm install @modelcontextprotocol/sdk  # TypeScript

MCP URL: https://logicnodes.io/mcp
API base: https://logicnodes.io
Docs: https://logicnodes.io/docs
API key (optional): https://logicnodes.io/checkout — pay-per-call via USDC x402, no subscription.

This PR

Adds one optional example file. No changes to core runtime, dependencies, or existing code.

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This contribution is made under DCO sign-off. No warranty expressed or implied.

Signed-off-by: LogicNodes contact@htsnavigator.com