curl --request GET \
  --url https://api.example.com/api/intelligence/v1/list-cross-source-signals

{
  "signals": [
    {
      "id": "<string>",
      "theater": "<string>",
      "summary": "<string>",
      "severityScore": 123,
      "detectedAt": 123,
      "contributingTypes": [
        "<string>"
      ],
      "signalCount": 123
    }
  ],
  "evaluatedAt": 123,
  "compositeCount": 123
}