Saxonberg Server API
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    Async preload — ensures the giver's species + every clade ancestor + the body plan are live runtime singletons before the sync isAnimate body runs. Without this preload, a fresh dispatch into the void would find getSpecies() returning null (species template never cloned) and isAnimate would report false for an otherwise-alive Homo sapiens avatar. Delegates to SpeciesApi.preloadAnatomy — the shared substrate helper that the sense / ESP validators and Avatar.installDefaultLoadout also use.