Return a clean Markdown FaithGPT answer using the production harness without FaithGPT rendering tags.
{
"prompt": "Explain Romans 8:28 with pastoral care.",
"responseFormat": "markdown",
"maxOutputTokens": 600
}{
"id": "string",
"answerMarkdown": "string",
"citations": "array",
"usage": "input/output token details",
"billing": "backend-calculated credit usage metadata"
}