/**
 * Decay Step — ported from KB sleep/steps/decay.ts.
 *
 * Applies time-based decay to memories:
 * - Older memories accumulate a higher decayScore
 * - Decay reduces priority over time
 * - accessCount counteracts decay (frequently accessed = important)
 * - Pinned memories are exempt
 *
 * Adapter note: KB reads from getTimelineDb(root) directly.
 * Arcana uses deps.structured (StructuredStore) instead.
 */
import type { MaintainDeps } from '../index.js';
import type { SleepConfig } from '../config.js';
export interface DecayResult {
    count: number;
    processed: number;
    errors?: string[];
}
export declare function runDecayMemories(deps: MaintainDeps, config: SleepConfig): Promise<DecayResult>;
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