/**
 * SyncMetaManager — track sync state between local store and engine.
 *
 * File: `.forgeos/sync_meta.json`
 *
 * Records last sync timestamp, remote/local head hashes, and any
 * unresolved conflicts detected during sync. All writes are atomic
 * (write to .tmp, rename).
 *
 * Uses only Node.js built-ins (fs, path, crypto). No external dependencies.
 */
import type { SyncMeta, ConflictRecord } from "./types.js";
export declare class SyncMetaManager {
    private filePath;
    constructor(projectRoot: string);
    /** Load sync metadata from disk. Returns a default empty state if the file does not exist. */
    load(): SyncMeta;
    /** Persist sync metadata to disk using an atomic write. */
    save(meta: SyncMeta): void;
    /**
     * Record a new conflict. Auto-generates id and timestamp, sets resolved=false.
     * Loads, mutates, and saves in one operation.
     */
    recordConflict(conflict: Omit<ConflictRecord, "id" | "timestamp" | "resolved">): void;
    /** Mark a conflict as resolved by its ID. No-op if the ID is not found. */
    resolveConflict(id: string): void;
    /** Return all conflicts that have not been resolved. */
    getUnresolvedConflicts(): ConflictRecord[];
}
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