export declare function backupManifestPath(): string;
/** Every recorded backup path (absent/corrupt manifest = empty list). */
export declare function readBackupManifest(): string[];
/** Record one backup file path. Deduped, capped, never throws. */
export declare function recordConfigBackup(backupPath: string): void;
/** Drop entries whose backup file no longer exists (post-cleanup compaction). */
export declare function pruneBackupManifest(): void;