Comprehensive multi-step research

curl --request POST \
  --url https://api.case.dev/search/v1/research \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "instructions": "<string>",
  "query": "<string>",
  "model": "normal",
  "outputSchema": {}
}
'

{
  "researchId": "research_abc123",
  "model": "normal",
  "results": {
    "summary": "Comprehensive analysis of contract law precedents...",
    "sources": [
      "Supreme Court ruling in...",
      "Federal statute..."
    ],
    "analysis": "Key findings indicate..."
  }
}