/** True if dir is the user's home directory or the filesystem root — compared
 *  by identity (device + inode), not by spelling. */
export declare function isNonProjectRoot(dir?: string): boolean;
/**
 * Exit 1 with a clear cd instruction if cwd cannot be a project root.
 * Call at the top of commands that create or interview project.faf.
 */
export declare function assertProjectCwd(dir?: string, command?: string): void;