Unified semantic + keyword retrieval (mirrors the MCP search tool)

curl --request POST \
  --url https://3ngram-server-production.up.railway.app/api/v1/search \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "query": "<string>",
  "asOf": {
    "asKnownAt": "2023-11-07T05:31:56Z",
    "validAt": "2023-11-07T05:31:56Z"
  },
  "limit": 5,
  "project": "<string>",
  "scope": "<string>"
}
'

{
  "count": 4503599627370495,
  "hits": [
    {
      "content": "<string>",
      "contentLength": 4503599627370495,
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "memoryType": "<string>",
      "score": 123,
      "topic": "<string>",
      "truncated": true
    }
  ]
}