{
  "scenario": {
    "id": "legacy-game-npc-shadow",
    "visibility": "source",
    "warmup_seconds": 30,
    "capture_seconds": 120,
    "rng_seed": 20260810,
    "baseline_runs": 5,
    "shadow_runs": 20
  },
  "region": {
    "id": "npc.paths",
    "baseline_route": "cpu_serial",
    "candidate_route": "cpu_parallel",
    "expected_profile": {
      "substrate": "D",
      "update": "P",
      "observation": "D",
      "transition_law": "F"
    }
  },
  "gec": {
    "state_fields": [
      "npc_paths",
      "npc_positions",
      "rng_state"
    ],
    "rng_policy": "strict",
    "event_policy": "causal_order",
    "tolerance": 0.0
  }
}