{
  "name": "Adaptive quality on real devices",
  "durationSeconds": 16,
  "chapters": [
    {
      "start": 0,
      "end": 4,
      "narration": "Preflight chooses a coherent quality band."
    },
    {
      "start": 4,
      "end": 8,
      "narration": "Particle and history budgets stay bounded."
    },
    {
      "start": 8,
      "end": 12,
      "narration": "Offscreen work pauses when hidden."
    },
    {
      "start": 12,
      "end": 16,
      "narration": "Heavy modes must remain readable."
    }
  ]
}