/**
 * Detect the git repository root for the current working directory.
 * Returns the absolute path to the git root, or null if not in a git repo.
 * Result is cached per execution to prevent spawning multiple processes.
 */
export declare function getGitRoot(): string | null;
/**
 * Reset the cached git root. Useful for testing or when the cwd changes significantly.
 */
export declare function resetGitRootCache(): void;