Validate campaign brief

Run the deterministic brief quality gate (the parity enforcer): proof points must trace to real GTM case studies/offers, decision-tree conditions must reference declared signals, the value proposition must link to a distinct ICP pain, and audience size must be sane. Pass briefId (a stored brief) OR plan (a raw brief plan you authored locally) - exactly one. mode launch (default) demotes generation-quality findings to warnings; strict treats them as errors. Returns { valid, errors, warnings }. Always run this before activating a brief you reasoned yourself.

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