/**
 * [WHO]: CuriosityQueue — persistent "want to understand" list for idle exploration
 * [FROM]: Depends on node:fs, node:path, node:os
 * [TO]: Consumed by ./index.ts, ./thinker.ts
 * [HERE]: extensions/builtin/idle-think/curiosity.ts - self-directed exploration agenda
 *
 * The queue is a JSON file at ~/.catui/agent/memory/idle-think-curiosity.json.
 * Topics are added from exploration insights and picked for the next exploration.
 */
export type CuriosityItem = {
    topic: string;
    addedAt: string;
    explored: boolean;
    exploredAt?: string;
};
export type CuriosityQueue = {
    items: CuriosityItem[];
};
/**
 * Load the curiosity queue from disk. Returns empty queue if file doesn't exist.
 */
export declare function loadCuriosityQueue(): CuriosityQueue;
/**
 * Save the curiosity queue to disk.
 */
export declare function saveCuriosityQueue(queue: CuriosityQueue): void;
/**
 * Pick the next unexplored topics to focus on.
 * Returns up to `count` topics, oldest first (FIFO).
 */
export declare function pickNextTopics(queue: CuriosityQueue, count?: number): CuriosityItem[];
/**
 * Mark topics as explored after they've been used in an exploration.
 */
export declare function markExplored(queue: CuriosityQueue, topics: string[]): void;
/**
 * Add new topics extracted from an exploration insight.
 * Deduplicates against existing topics.
 */
export declare function addTopicsFromInsight(queue: CuriosityQueue, topics: string[]): void;
/**
 * Extract "want to understand" topics from an insight text.
 * Looks for a "Curiosity" or "Want to explore" section in the text.
 * If not found, returns empty array (no topics extracted).
 */
export declare function extractTopicsFromInsight(insightText: string): string[];