{
  "clips": 138,
  "sessions": 55,
  "tasks": {
    "duplex": 67,
    "semantic": 71
  },
  "source_counts": {
    "improvised": 56,
    "naturalistic": 82
  },
  "human_duplex_categories": {
    "backchannel": 22,
    "duplex_overlap": 20,
    "interruption_target": 15,
    "interruption_partner": 10
  },
  "clip_seconds": 20,
  "rating_interval_seconds": [
    4,
    16
  ],
  "mllm_context": "Frozen per-clip context; candidate focus intervals may differ from the objective rating interval."
}