/**
 * Neutralize control characters in text this tool did not author.
 *
 * Agent output, task text, question text and notes are all untrusted: a model
 * can emit cursor movement, clear-screen, or OSC 52 clipboard writes, and
 * rendering those raw would let the thing being judged hide or forge the
 * evidence on screen. Only newline and tab survive, because the layout uses
 * them; everything else in C0, C1 and DEL becomes a visible replacement so the
 * reader can see something was there.
 *
 * Style tags stay unchanged. Escape them separately when rendering through
 * a style parser.
 */
export declare function stripControlCharacters(text: string): string;