GET /entities/{entity_id}

curl "http://localhost:8000/entities/entity-abc123?tenant_id=demo&evidence_limit=5"

{
  "entity": {
    "kos_id": "entity-abc123",
    "name": "Andrew Ng",
    "type": "person",
    "properties": {
      "tenant_id": "demo"
    }
  },
  "summary": "Andrew Ng is a computer scientist and entrepreneur known for his work in machine learning and AI education.",
  "facts": [
    {
      "predicate": "works_at",
      "object_id": "entity-stanford",
      "object_name": "Stanford University",
      "object_type": "organization"
    },
    {
      "predicate": "founded",
      "object_id": "entity-coursera",
      "object_name": "Coursera",
      "object_type": "organization"
    }
  ],
  "evidence_snippets": [
    {
      "passage_id": "passage-123",
      "text": "Dr. Andrew Ng from Stanford University has been instrumental in popularizing machine learning through his online courses.",
      "source_item_id": "item-456",
      "source_title": "Introduction to Machine Learning"
    }
  ],
  "related_entities": [
    {
      "kos_id": "entity-stanford",
      "name": "Stanford University",
      "type": "organization",
      "properties": {}
    }
  ],
  "timeline": []
}

{
  "detail": "Entity not found"
}

{
  "detail": "Entity graph not available. Neo4j provider not configured."
}