batch search

Run several DIFFERENT queries in one call, concurrently — one result set per query. (Use `multi_query_search` instead when you have ONE question and want variants fused into a single ranked list.) Great for assembling a brief that needs multiple facts at once (e.g. ["repo rate", "CPI inflation", "GDP growth", "fiscal deficit"]). Args: queries: List of distinct queries (max 10; deduped). authoritie