Create campaign brief

Expand a chosen idea into a full structured campaign brief (ICP rubric, targeting filters, required research signals, message decision tree, frameworks, cadence). For kind=campaign pass the ideaId from create-strategy-ideas. kind=content or engagement build single-shot from workspace context (no ideaId). The brief persists as draft; run activate-brief to launch it. Returns { agentRunId, brief, kind }.

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "create-campaign-brief",
    "arguments": {
      "allowHostedAi": true
    }
  }
}