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Surface hydrology policy split, native terrain height cache, watched-edit hotload cancellation, world-save requestSave with tracked ownership flush, background-task drain that follows saves admitted mid-drain, peaceful spawn guard, cached-completion terminal state, IO drains off the owner thread. Studio pregen at scale: detached historical runtimes keep the configured noise cache instead of the Studio-wide cache; retired runtimes are no longer pinned by the volumetric fragment filter's per-thread scratch; pregen mantle cleanup and native region flushes run on per-run threads instead of the server thread and the shared Iris IO pool (the flush on the IO pool starved tectonic plate loads and wedged every Paper worker in Mantle.getChunks); background-task cancellation claims tasks atomically.