/**
 * Deterministic SHA-256 content hash of a directory tree.
 *
 * Walks the tree, sorts entries by forward-slash relative path, and feeds each
 * relative path plus its bytes into a single hash. Order-independent and
 * platform-independent (forward-slash keys). Symlinks are followed only via
 * the directory listing; callers that need symlink rejection use stageDirInto.
 *
 * @param dir Absolute path to the directory to hash.
 * @returns 64-char lowercase hex SHA-256.
 */
export declare function hashDirectory(dir: string): Promise<string>;
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