A NestVariant defines the visual, behavioral, and structural data for a specific kind of nest - such as a chicken nest, or parrot cliff nest, or future duck water nest

Draft/Pseudo YAML for configuring a nest variant (requires certain IDs of built registries or custom model configs etc.)

Variants and their types can also define recipes to craft the nest e.g.

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Variants are data-driven, and logic is decoupled from species - the same nest can be used by multiple birds, depending on what the species has configured (if any).