The comparison clip (the same script for every model)

Written from the prompt (test v1, checks v1). The model never saw them.

• ✓Opens without a page error
• ✓Test hooks present (getState, setGravity, pause, resume, reset)
• ✓Visible canvas, at least 800×6001346×907
• ✓Animation is alive (frames keep changing)372 quadros em 3 s; imagem mudou
• ✓Smooth: median frame time under 25 msintervalo mediano 8.3 ms (~120 fps)
• ✓Starts by itself: balls fall and reach the binsdropped=312 inBins=233
• ✓At least 13 bins15 caixas
• ✓Counters add up (balls in bins ≤ balls dropped)soma=233 inBins=233 dropped=312
• ✗Bell-shaped histogram (half the balls in the middle third)terço central com 43% de 233 bolas
• ✓Pause freezes, resume continuespausado: 315→315; depois de retomar: 342
• ✓Changing gravity changes the scene650 → 520 (pedido 520.0)
• ✓Reset empties the binsdepois do reset: inBins=0 dropped=3
• ✓No uncaught exception during the session
• ✓No console errors
• ✓No network attempts