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{
  "version": "fourtask_common_v3",
  "tasks": {
    "HOS": 4536,
    "sound_class": 716,
    "duration": 1076,
    "order": 1076
  },
  "seed": 42,
  "observation": {
    "hfov_degrees": 100,
    "width": 640,
    "height": 360,
    "history_views": 2,
    "max_pixels": 65536,
    "history_content": "past views and executed actions only; no model-specific reasoning retained"
  },
  "generation": {
    "max_new_tokens": 512,
    "do_sample": false,
    "answer_prefill": false,
    "constrained_decoding": false,
    "max_actions_per_episode": 10,
    "invalid_action": "consume one decision, keep pose unchanged; no repair or retry",
    "action_parser": "exactly one answer block containing one integer rotate or submit; reasoning outside answer ignored"
  },
  "audio": {
    "source_duration_seconds": 10,
    "orientation": "fixed original microphone",
    "source_channels": 2,
    "tracks": [
      "vision_only",
      "vision_mono",
      "vision_stereo"
    ],
    "unsupported_modalities": "N/A; never substitute transcript, silence or mono and call it identical input",
    "track_selection": "HOS: vision_only; sound tasks: vision_stereo; input ablations explicitly disable the selected modality."
  },
  "fairness": {
    "same_state_same_observation": true,
    "same_trajectory_not_required": true,
    "task_text_identical_within_track": true,
    "model_chat_template_and_special_tokens": "native serialization only, disclosed and logged separately",
    "model_specific_semantic_prompt": false,
    "composite_models": "separate architecture track; helper prompts/evidence must be disclosed, not certified identical end-to-end prompt",
    "test_checkpoint_selection": false
  },
  "scoring": {
    "HOS": "strict current-pose submission plus frozen geometric scorer",
    "sound": "frozen sound_search_core.score",
    "completion": "exact IDs, action replay, input/prompt contract audit"
  }
}