Post an intent

POST https://api.curb.numetal.xyz/v1/intents
Content-Type: application/json

{
  "model": "llama-3.3-70b",
  "mtok": 2,
  "maxPriceUsd": 0.5,
  "offerId": "optional-pin",
  "buyer": "0x…"
}

Required: mtok. Optional model, maxPriceUsd, offerId, buyer.

Hub auto-matches an open offer when constraints fit. Response 201 includes the intent and, when matched, a match.