/**
 * Shared utility — normalize a project directory path.
 *
 * Two callers per spec §2.1: stage 0 (discover) and stage 2 (edges).
 * Cache invalidation also normalizes tsConfigPath the same way, making
 * three callers and justifying extraction (rule of three).
 */
/**
 * Normalize a project directory: resolve to absolute, then realpath
 * (follows symlinks). Throws ConfigurationError if missing or not a
 * directory.
 */
export declare function normalizeProjectDir(input: string): string;
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