/**
 * Voyage AI Reranking - ZERO RISK Addition
 * This is purely additive - if it fails, search works normally
 */
/**
 * Rerank documents for better relevance
 * SAFE: If this fails, returns original order
 */
export declare function rerankResults(query: string, documents: any[], topK?: number): Promise<any[]>;
/**
 * Check if reranking is available (for logging only)
 */
export declare function isRerankingAvailable(): boolean;
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