SkyLanders Create Aeronautics

> ⚠️ Worldgen changes apply to **newly generated chunks only** — already-explored > areas keep their old ore distances and island layout. **Frontier gates** - Added a KubeJS-driven handler for the frontier age-gates (`kubejs/server_scripts/frontier_gates.js`). The **Copper / Iron / Diamond / Advanced** frontier quests now auto-complete at **1000 / 2000 / 3000 / 4000 blocks** from spawn. Required for those gates to work after 1.0.2 retired the mod-side handler — without it the age unlocks would soft-lock. **Worldgen — exploration distances** - Compressed the distance-gated ore "age" rings so each tier spawns far closer to spawn (roughly halved): **asurine 0–1k, copper 1–2k, iron 2–3k, diamond 3–4k, advanced metals 4–5k**; renewable ore meteors now cap at **8k** (down from 15k). - Sky islands are now **smaller and more common**: large-island radius **300–400 → 220–300**, cluster spacing **1300 → 950**, island density **0.8 → 0.9**. **Quests** - Reworded the four frontier quests and their task titles/descriptions to the new distances, and moved the gating logic over to KubeJS. **Mod — skylandersmeteors 1.21 → 1.22** - Removed the now-unused `FrontierTaskHandler` (frontier gating moved to KubeJS) and the sapling self-plant handler (the zinc-age Deployer covers replanting).