/**
 * Deadline and cancellation errors must surface as THEMSELVES all the way to
 * the engine, which renders the graceful "bounded execution deadline" message
 * keyed on `err.name === 'TimeoutError'`. Any catch that flattens them into a
 * provider-failure string ("Claude subscription failed: …") strips the name and
 * turns a clean timeout into a confusing raw error for the user.
 *
 * Call this FIRST in every signal-aware fallback catch. It rethrows when the
 * error is a cancellation/deadline (or the signal already fired) and returns
 * normally otherwise so the catch can apply its ordinary fallback.
 */
export declare function rethrowIfCancelled(err: unknown, signal?: AbortSignal): void;
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