Start an Agent Builder session

curl --request POST \
  --url https://dashboard.sequentum.com/api/v1/agent-builder/start \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "mode": "<string>",
  "url": "<string>",
  "prompt": "<string>",
  "spaceId": 123
}
'

{
  "success": true,
  "sessionId": "<string>",
  "error": "<string>"
}