Polymarket CLOB open (active) orders for a wallet

Active CLOB orders for the wallet. The CLOB orders endpoint is L2-authenticated and orders are private to the key holder (not on-chain), so Artery CANNOT read them by address alone. The caller (which holds the wallet's CLOB credentials) pre-signs the Polymarket auth and passes it as the request headers `X-Poly-Address`, `X-Poly-Api-Key`, `X-Poly-Signature`, `X-Poly-Timestamp`, `X-Poly-Passphrase` — Artery maps them to the upstream `POLY_*` headers and forwards verbatim, storing NOTHING (the signature is short-lived/time-bound). Optional `market` (condition id) / `assetId` (token id) filters. Returns the official paginated CLOB response (`limit`, `next_cursor`, `count`, `data`) as `native` (QF-10795 G3).