/**
 * MK2 Phase 1B: Debug Overlay
 *
 * Top line only, never exceeds safeW
 * Shows layout info for verification
 * FIXED: Enhanced debug info when DEBUG_LAYOUT=1
 */
import { type Widgets } from 'neo-blessed';
import type { LayoutSpec } from '../layout/computeLayout.js';
/**
 * Create debug overlay line (top of screen) - MK2 Hotfix: Show guards
 * Truncated to safeW to prevent overflow
 * If DEBUG_LAYOUT=1, shows detailed rect info
 */
export declare function createDebugOverlay(screen: Widgets.Screen, spec: LayoutSpec): Widgets.Box | null;
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