/**
 * Marker base class for errors that retrying will never fix — schema-validation
 * failures, unauthorized responses, contract violations, etc.
 *
 * The queryClient retry handler short-circuits when it sees this; without it,
 * a non-transient backend bug pins the UI through the full retry budget
 * (default 3× exponential backoff ≈ 7s).
 *
 * Lives in its own module — free of `@tanstack/query-core` — so error types that
 * extend it (e.g. `FontResponseError`) can be imported without dragging the
 * TanStack client and its eager `new QueryClient()` instantiation into the
 * importer's module graph. See the barrel-coupling notes in the FSD audit.
 */
export class NonRetryableError extends Error {}