/** Reject symlink traversal only on paths that the synchronizer owns and writes. */
export declare function assertCharacterWritePath(root: string, target: string): Promise<void>;
/** Commit only a fully prepared library; restore the old root if activation fails. Caller owns the mutation lock. */
export declare function stageCharacterLibrary<T>(root: string, signal: AbortSignal, prepare: (staged: string) => Promise<{
    value: T;
    changed: boolean;
}>): Promise<T>;