feat(tools): Register Polymarket Prediction Market Intelligence x402 Tool

[Jonbaz32]

Polymarket Prediction Market Intelligence x402 Mech Tool

This Pull Request registers the Polymarket Prediction Market Intelligence x402 tool adapter for Olas Mech Worker Nodes and Pearl / Polystrat trading agents.

• Tool Name: polymarket_intelligence
• Production API: https://agent-payment-gateway.vercel.app/v1/prediction-market-analysis
• Price: $0.05 USDC
• Settlement Chain: Base Mainnet (eip155:8453)
• USDC Contract: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
• Merchant Recipient: 0x43f9a721B59C247B6258e72A1Bf5A384b64F8A38

Key Characteristics:

• No Credentials Included: Operators configure their own Base USDC payment wallet credentials in service.yaml.
• x402 Protocol Flow: Handles HTTP 402 challenges, Base Mainnet USDC authorization, and facilitator settlement.
• Unit Tests Included: 100% mocked unit tests in tests/test_tool_mocked.py.
• Live Deployment Note: Live Pearl agent usage requires Mech worker operators to deploy the updated release.

[Jonbaz32]

Hi Valory Team,

Following up on PR #447. This PR registers tool polymarket_intelligence for prediction market agents (Polystrat / Pearl Predictor):

• Service: Live Polymarket prediction market analysis, implied probabilities, volume/liquidity metrics, and risk flags.
• Protocol: Standard x402 payment flow ($0.05 USDC on Base Mainnet eip155:8453).
• Security: Contains no hardcoded private keys or credentials. Mech worker node operators configure their own payment wallet in service.yaml.
• Testing: 100% mocked unit tests in tests/test_tool_mocked.py.

We would appreciate maintainer review and any requested feedback or changes. Thank you!