/**
 * Typed evidence only: error prose is not a recovery authority.
 * Keep this eager timeline predicate independent of the lazy recovery controller.
 */
export declare function isStructuralSandboxFailure(payload: Record<string, unknown>): boolean;
/** A known no-compute route has no checkpoint to restore. Unknown routes stay gated. */
export declare function needsSandboxRecoveryCheck(route: {
    sandboxBackend?: string | undefined;
    activeSandboxId?: string | null | undefined;
}, structuralFailure?: boolean): boolean;