fix: score distribution chart bars + add binaryDecision backfill script

Chart: fixed bars not rendering by using explicit h-[160px] + min-h-0 on
the bar container so percentage-based heights resolve correctly.

Script: one-off backfill copies the custom "Move to the Next Stage?" boolean
criterion value into binaryDecision for evaluations where it's null.
Run: npx tsx scripts/backfill-binary-decision.ts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/admin/round/score-distribution.tsx

@@ -38,13 +38,13 @@ export function ScoreDistribution({ roundId }: ScoreDistributionProps) {
             No evaluations submitted yet
           </p>
         ) : (
-          <div className="flex gap-1 flex-1 min-h-[120px]">
+          <div className="flex gap-1 h-[160px]">
             {dist.globalDistribution.map((bucket) => {
               const heightPct = (bucket.count / maxCount) * 100
               return (
-                <div key={bucket.score} className="flex-1 flex flex-col items-center gap-1 h-full">
+                <div key={bucket.score} className="flex-1 flex flex-col items-center gap-1">
                   <span className="text-[9px] text-muted-foreground">{bucket.count || ''}</span>
-                  <div className="w-full flex-1 relative">
+                  <div className="w-full flex-1 relative min-h-0">
                     <div className={cn(
                       'absolute inset-x-0 bottom-0 rounded-t transition-all',
                       bucket.score <= 3 ? 'bg-red-400' :