ECharts (via ChartShell, SSR-safe) chart of deficit_index across horizons per
scenario (база/агр/конс, --viz-1..3) + dashed rate-path on a secondary axis +
баланс/целевой markLines, tooltip with units. Renders above the 6.1 table;
returns null on thin reports. Makes the §22 forecast signal glanceable for demos.