Place a market order (reserved)

Option A: a market order maps to the internal buyPosition flow (instant fill at pool price). Wiring to the trade path is pending; currently returns 501.

curl -X POST "https://example.com/clob/orders" \  -H "Content-Type: application/json" \  -d '{    "marketId": "string",    "side": "yes",    "size": 0  }'

{  "error": "string",  "detail": "string"}