assistant-ui Observability Always consult assistant-ui.com/llms.txt for the latest API. Observability has two separate layers. Langfuse, LangSmith, and Helicone instrument backend model calls. renders span data already collected by your application. It does not send traces to a provider or derive spans from the assistant runtime. References - ./references/langfuse.md -- OpenTelemetry setup, trace attributes, and serverless flushing for Langfuse. - ./references/langsmith.md -- , metadata, and serverless flushing for LangSmith. - ./references/helicone.md -- Helicone proxy setup for AI SDK and O…