/**
 * Quality scoring utilities shared by BM25, vector, and fusion search.
 *
 * @module services/search/quality
 */
/**
 * Compute a quality-weighted score multiplier from an OCR quality score.
 * Quality 5.0 -> 1.0, Quality 0.0 -> 0.8, null/undefined -> 0.9 (neutral)
 */
export declare function computeQualityMultiplier(qualityScore: number | null | undefined): number;
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