/**
 * Earlier versions silently appended a completion eval to the user's shell rc.
 * The `completion` subcommand has since been removed, so sourcing the rc now
 * errors with `command not found: amplitude-wizard`. Remove only the exact
 * block we added so users aren't stuck with a broken shell config.
 *
 * After the first successful pass, drop a sentinel file next to the cache
 * root so subsequent invocations short-circuit. The original cleanup pass
 * read three rc files unconditionally on every run — a tax that compounded
 * with the rest of the cold-start chain. The sentinel keeps the one-shot
 * cleanup intact while making it actually one-shot.
 */
export declare function cleanupShellCompletionLine(): void;
