{
  "_readme": [
    "Tuning for The Personal Island (docs/wiki/world/island-substrate.md).",
    "Owner-edited. null = undecided; illustrative:true = V1 shape, not commitment."
  ],
  "upgrades": [
    { "id": "windmill", "effect": "crop_speed", "route": "rate_hook", "cost": null, "illustrative": true },
    { "id": "water_tower", "effect": "auto_irrigation", "route": "infrastructure", "cost": null, "illustrative": true },
    { "id": "crystal_beacon", "effect": "mining_xp", "route": "rate_hook", "cost": null, "illustrative": true },
    { "id": "dragon_shrine", "effect": "combat_buffs", "route": "rate_hook", "cost": null, "illustrative": true },
    { "id": "bee_sanctuary", "effect": "honey_production", "route": "infrastructure", "cost": null, "illustrative": true },
    { "id": "observatory", "effect": "night_fishing_luck", "route": "rate_hook", "cost": null, "illustrative": true },
    { "id": "greenhouse", "effect": "off_season_crops", "route": "infrastructure", "cost": null, "illustrative": true },
    { "id": "warehouse", "effect": "storage_increase", "route": "infrastructure", "cost": null, "illustrative": true }
  ],
  "configs": {
    "free_base": ["time", "weather", "season", "ambience"],
    "premium": { "skies": ["aurora", "eclipse", "meteor_shower", "two_moons", "giant_planet"], "split": "earned_or_shop_per_entry", "assignments": null }
  },
  "themes": { "list": ["ancient_ruins", "floating_temple", "dwarven_forge", "pirate_cove", "crystal_garden", "haunted_cemetery", "mushroom_kingdom", "dragon_sanctuary"], "split_assignments": null, "illustrative": true },
  "ponds": { "yield": "basic_fish_only", "floor_rate": null },
  "visitor_roles": ["builder", "decorator", "farmer", "storage"],
  "wonders": { "table": ["giant_crystal", "ancient_tree", "meteor_crater", "dragon_skeleton", "ruined_temple", "giant_waterfall"], "reroll_policy": null, "illustrative": true }
}