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### Changed - **Cleanup is now Overworld-only.** Previous releases ran the cleanup algorithm on every dimension whose generator was `NoiseBasedChunkGenerator` — Overworld, Nether, End, and most modded dimensions — even though the algorithm is designed for Overworld surface biomes and the warming/preprocessing path was already Overworld-only. The mismatch wasted CPU on Nether and End chunks and could subtly modify their biome layout where the global `sizeThreshold` happened to apply. Cleanup now short-circuits in the chunk-generation mixin for any `BiomeSource` whose `possibleBiomes()` doesn't contain `minecraft:plains` or `minecraft:forest` — both present in any vanilla or modded Overworld, neither in the vanilla Nether or End. Modded dimensions that include either biome are still treated as Overworld-like.