export interface DownloadOwner {
    schemaVersion: 1;
    id: string;
    hostname: string;
    parentPid: number;
    workerPid: number | null;
    downloaderPid: number | null;
    phase: "allocated" | "idle" | "spawning" | "downloading";
}
export interface DownloadCredentialRecovery {
    removed: string[];
    blocked: string[];
}
export declare function allocateDownloadCredentials(root: string): Promise<{
    directory: string;
    owner: DownloadOwner;
}>;
export declare function readDownloadOwner(directory: string): Promise<DownloadOwner>;
export declare function updateDownloadOwner(directory: string, owner: DownloadOwner, update: Partial<Pick<DownloadOwner, "workerPid" | "downloaderPid" | "phase">>): Promise<void>;
/** 当前所有者也只能清理已确认没有下载进程的目录；冷恢复绝不按旧 PID 杀进程。 */
export declare function cleanupDownloadCredentials(directory: string, ownerId: string, activeWorker?: boolean): Promise<void>;
/** 必须在控制服务工作区独占锁内执行。存活、PID重用、不同主机和损坏状态均保守阻断。 */
export declare function recoverDownloadCredentials(root: string): Promise<DownloadCredentialRecovery>;
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