Slice window end

Stored window.through on the OpenRouter slice file. The label is through. The value is the stored date 2026-10-27. The same window stores from 2026-04-27. The bar is full when an end date is stored. The bar is not a score. This is the benchmark slice window end, not the slice window start, not the rankings file end, not the rankings window end, and not the app board end. A missing end date stays off the page.