40 scenes, resuming at 0, model qwen2.5:3b-instruct
  10/40  18s  prefill 2s  gen 6s
  20/40  35s  prefill 4s  gen 12s
  30/40  55s  prefill 7s  gen 19s
  40/40  74s  prefill 9s  gen 25s
done: 40 summaries, 74s this session