Add deterministic testnet USDC routing agent with failure-memory demo

[Azubuike321]

Motivation

• Provide a minimal, deterministic agent that routes testnet USDC and demonstrably avoids previously failing routes by remembering outcomes.
• Meet the hackathon MVP requirement: record failures, persist them, and change routing decisions deterministically (no ML/LLM).

Description

• Add a JSON-backed economic memory store implemented in src/memoryStore.js that records per (routeId, recipientAgentId) successCount, failureCount, and lastAttemptedTimestamp.
• Implement a rule-based RoutingAgent in src/routingAgent.js that computes a simple riskScore (equal to failureCount) and selects the route with the lowest score.
• Provide a transfer simulator src/mockUsdcTransfer.js with explicit outcomes (success, revert, timeout, mocked_failure) to simulate testnet USDC behavior.
• Add src/demo.js and an npm script to reproduce the required sequence: intentional failure on route-A, memory update, and subsequent reroute to route-B with success; persistent state is written to data/economic-memory.json.

Testing

• Executed the demo with npm run demo and it succeeded (logs show chosen route, transfer outcome, failure reason, and memory updates for both attempts).
• Verified data/economic-memory.json contains route-A with failureCount: 1 and route-B with successCount: 1, demonstrating the agent avoided the failed path on the second attempt.
• No additional automated tests were added to keep the project minimal and focused on the required demonstration.

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Codex Task

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