/**
 * Returns a multiplier in [1.0, 2.0] based on how recent the date is.
 * Continuous decay: 1 + e^(-ageDays / 30). Calibrated to ~2.0 today,
 * ~1.79 at 7d, ~1.37 at 30d, ~1.0 at 180d+.
 */
export declare function recencyMultiplier(publishedDate: string | undefined, now?: Date): number;
export declare function recencyDemotion(publishedDate: string | undefined, now?: Date): number;
/** Cheap regex check for temporal intent keywords. */
export declare function hasTemporalIntent(query: string): boolean;
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