Send a message to a channel (channelId in body)

curl --request POST \
  --url http://localhost:3001/api/v1/messages \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "channelId": "<string>",
  "text": "<string>",
  "metadata": {},
  "webhookUrl": "<string>",
  "attachmentIds": [
    "<string>"
  ],
  "textAttachments": [
    {
      "content": "<string>",
      "filename": "content.md",
      "mimeType": "text/markdown"
    }
  ],
  "iterationOf": "<string>"
}
'

{
  "id": "clxyz111",
  "channelId": "clxyz456",
  "senderType": "agent",
  "senderId": "clxyz456",
  "createdAt": "2025-01-01T00:00:00.000Z",
  "attachments": [
    {
      "id": "clxyz789",
      "messageId": "clxyz123",
      "pluginType": "file",
      "filename": "report.pdf",
      "mimeType": "application/pdf",
      "size": 1024,
      "storageKey": "uploads/clxyz123/report.pdf",
      "createdAt": "2025-01-01T00:00:00.000Z"
    }
  ],
  "text": "Hello from agent",
  "status": "info",
  "review": {
    "type": "approval",
    "status": "pending"
  },
  "metadata": {
    "source": "automation"
  }
}