/**
 * Feedback Engine — tracks whether recalled memories led to action.
 *
 * After search results are returned, tracks result IDs. When a file_modify
 * event touches a file mentioned in search results, marks those results
 * as "useful". At session end, batch-updates last_useful_at and boosts
 * relevance_score for useful entries.
 */
import type { StoragePlugin } from './types.js';
export declare class FeedbackEngine {
    private storage;
    private trackedResults;
    private usefulIds;
    constructor(storage: StoragePlugin);
    /**
     * Track search result IDs and their associated files.
     * Called after search/recall returns results.
     */
    trackSearchResults(resultIds: string[]): void;
    /**
     * Check if an event indicates usefulness of tracked results.
     * Called on file_modify events.
     */
    checkUsefulness(eventData: {
        file?: string;
        files?: string[];
    }): void;
    /**
     * Batch-update last_useful_at and boost relevance_score for useful entries.
     * Called at session end (handoff).
     */
    flushFeedback(): {
        updated_observations: number;
        updated_knowledge: number;
    };
    /**
     * Get current tracking state for testing.
     */
    getTrackedCount(): number;
    getUsefulCount(): number;
}
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