Stored slice missing count

Stored missing-in-window count for each OpenRouter benchmark slice. The label is the stored slice id, kept as written. The number is the stored missing_in_window. Bar length is that count against the highest count on this page. A longer bar means more models in the window with no score on that slice. This is not the roster fill, not the ranked count, and not a score. A slice with no stored missing count stays off the page.