Manual Llm Validate Multipart

Validate an LLM scorer manually, with optional query/response file uploads.

Args: body: JSON-encoded GeneratedScorerValidationRequest. query_files: Optional files attached to the query side of the validation. response_files: Optional files attached to the response side of the validation. ctx: Async request context with the authenticated user and read session.

Returns: A pending task result the caller can poll for validation results.