/**
 * Ensures that an entry exists in .gitignore at the given repository root.
 * Idempotent: if the entry already exists, this is a no-op.
 * If not in a git repo (no .git/ directory), this is also a no-op.
 *
 * @param cwd Repository root directory
 * @param entry The .gitignore entry to ensure (e.g., ".lyse/")
 */
export declare function ensureGitignoreEntry(cwd: string, entry: string): Promise<void>;