{
  "name": "entity_survives_fall",
  "description": "Goblin falls onto stone floor and survives",
  "seed": 42,
  "init_mode": "empty",
  "setup": [
    {"type": "fill_rect", "x": 100, "y": 130, "w": 20, "h": 5, "material": "stone"},
    {"type": "spawn", "kind": "goblin", "x": 110, "y": 115}
  ],
  "steps": 60,
  "assertions": [
    {"type": "entity_alive", "id": 1},
    {"type": "player_alive"}
  ]
}