feat: /judge review + scoring + leaderboard — TDD

Final screen — replaces the last WorkshopStub; App.tsx now has zero stubs:
- SubmissionList: live review queue with scored markers + selection
- AddReview: read-only render of a submitted 5-layer ADD
- ScoreForm: 0-10 rubric per layer, auto-summed total, notes
- Leaderboard: ranked teams by average judge total
- Judge page (behind name+code AccessGate): queue + review/score + leaderboard,
  refreshes on scoring and on any collective event

21 new tests; suite 140/140 green, typecheck + lint clean, build OK.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

src/components/SubmissionList.tsx

@@ -0,0 +1,38 @@
+import type { SubmissionSummary } from '@/types'
+import { Badge } from '@/components/ui/badge'
+import { cn } from '@/lib/utils'
+
+export interface SubmissionListProps {
+  items: SubmissionSummary[]
+  selectedId?: string
+  onSelect: (teamId: string) => void
+}
+
+/** Judge review queue. Pure presentational. */
+export function SubmissionList({ items, selectedId, onSelect }: SubmissionListProps) {
+  if (!items.length) {
+    return <p className="text-sm text-muted-foreground">No submissions yet.</p>
+  }
+  return (
+    <div className="space-y-1" data-testid="submission-list">
+      {items.map((s) => (
+        <button
+          key={s.teamId}
+          type="button"
+          data-team={s.teamId}
+          aria-current={s.teamId === selectedId}
+          onClick={() => onSelect(s.teamId)}
+          className={cn(
+            'w-full text-left rounded-md border px-3 py-2 transition',
+            s.teamId === selectedId ? 'border-primary bg-primary/5' : 'border-border hover:border-primary/40',
+          )}
+        >
+          <div className="flex items-center justify-between gap-2">
+            <span className="text-sm font-medium truncate">{s.teamName || s.teamId}</span>
+            {s.scored && <Badge className="font-mono text-[8px] uppercase tracking-wider">scored</Badge>}
+          </div>
+        </button>
+      ))}
+    </div>
+  )
+}