Update campaign brief

Edit an existing campaign brief without hosted AI. Pass a partial plan, including name, frontEndOffer {name, description, whyIcpWantsIt}, or operatingContract with offerScore {deliveryCost, prospectValue, competenceProof, painFit, linkedinFriction, reasoning, total, verdict}. Scores are integers 1-5; total is their sum; verdict strong at 21+, usable at 16+, otherwise weak. Preserve other operatingContract fields. Asset selection uses selectedAssetBinding and is validated server-side.

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "update-campaign-brief",
    "arguments": {
      "briefId": "00000000-0000-4000-8000-000000000000"
    }
  }
}

{
  "type": "object",
  "properties": {
    "brief": {
      "type": "object",
      "additionalProperties": true
    },
    "scoutPaused": {
      "type": "boolean"
    }
  },
  "required": [
    "brief",
    "scoutPaused"
  ]
}