curl --request GET \
  --url https://api.factory.ai/api/v0/sessions/{sessionId}/messages/{messageId} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "role": "user",
  "content": [
    {
      "type": "text",
      "text": "<string>",
      "id": "<string>"
    }
  ],
  "createdAt": 123,
  "updatedAt": 123,
  "parentId": "<string>",
  "visibility": "both",
  "openaiMessageId": "<string>",
  "openaiPhase": "commentary",
  "openaiEncryptedContent": "<string>",
  "openaiReasoningId": "<string>",
  "openaiReasoningSummary": "<string>",
  "geminiThoughtSignature": "<string>",
  "chatCompletionReasoningField": "reasoning",
  "chatCompletionReasoningContent": "<string>",
  "isUserVisible": true,
  "isError": true
}