Polymarket CLOB Order Signer

This tool signs Polymarket central limit order book (CLOB) orders using EIP-712 typed data so a Vault Mind can approve trades without holding the session key. It accepts structured order parameters: orderType (LIMIT, MARKET, CANCEL), side (BUY, SELL), tokenId (outcome or condition ID), price and size as strings, expiration as a Unix timestamp integer, and optional feeRate in basis points. Given these inputs, it produces a signed order payload ready for Polymarket API broadcast. The worker must transform inputs into output JSON that strictly validates against the system-provided structured output schema, with no extra fields and correct types and enumerations.