curl --request POST \
  --url https://geoff.ai/api/v1/code/sandbox \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "language": "python",
    "packages": ["numpy", "pandas", "matplotlib"]
  }'

{
  "data": {
    "sandbox_id": "sandbox_abc123",
    "status": "ready",
    "language": "python",
    "created_at": "2026-01-01T00:00:00Z"
  }
}