Bar rack blocks: store 50 bars each, F lets them out oldest first (t1)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/sim/items.js

@@ -153,6 +153,7 @@ function entTick() {
       }
       e.ix = cx; e.iy = cy;
     }
+    if (rackIntake(e)) { ents.splice(k, 1); continue; }
     const cx = e.ix, cy = e.iy;
     // heat: the bar tends toward the temperature around it
     const T = temp[Math.min(H - 1, cy + 1) * W + Math.min(W - 1, cx + 1)];