Get research status and results

curl --request GET \
  --url https://api.case.dev/search/v1/research/{id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "research_abc123",
  "status": "completed",
  "query": "Recent developments in AI liability law",
  "model": "pro",
  "results": {
    "summary": "Recent AI liability law developments focus on establishing clear frameworks for algorithmic accountability, with the EU leading regulatory efforts through the AI Act while the US pursues sector-specific approaches.",
    "sections": [
      {
        "title": "EU AI Act Implementation",
        "content": "The European Union's AI Act, which came into force in 2024, establishes a risk-based approach to AI regulation...",
        "sources": [
          {
            "url": "https://example.com/ai-act-analysis",
            "title": "EU AI Act: Legal Framework Analysis",
            "snippet": "The AI Act introduces tiered liability based on risk assessment..."
          }
        ]
      }
    ],
    "sources": [
      {
        "url": "https://example.com/ai-act-analysis",
        "title": "EU AI Act: Legal Framework Analysis",
        "snippet": "The AI Act introduces tiered liability based on risk assessment..."
      }
    ]
  },
  "progress": 100,
  "createdAt": "2024-01-15T10:30:00Z",
  "completedAt": "2024-01-15T10:32:45Z"
}