/**
 * 记忆存储实现
 *
 * P2-12: 基于文件系统的记忆存储
 *
 * 存储结构：
 * .specpow/memory/
 *   ├── index.json          # 主索引文件
 *   ├── sessions/           # 会话日志
 *   │   ├── {sessionId}.json
 *   │   └── ...
 *   └── archives/           # 归档记忆（压缩后的旧记忆）
 *       └── {year}-{month}.json
 */
import type { MemoryIndex, MemoryStore, SessionLog } from './memory-types.js';
export declare class FileMemoryStore implements MemoryStore {
    private memoryDir;
    private indexPath;
    constructor(projectRoot: string);
    private ensureDir;
    load(): Promise<MemoryIndex>;
    save(index: MemoryIndex): Promise<void>;
    clear(): Promise<void>;
    private createEmptyIndex;
    private serializeIndex;
    private deserializeIndex;
    saveSessionLog(sessionId: string, log: SessionLog): Promise<void>;
    loadSessionLog(sessionId: string): Promise<SessionLog | null>;
    listSessionIds(): Promise<string[]>;
}
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