perf(model): reuse block atlas readback - #625
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Caches Minecraft’s block-atlas CPU readback and reuses it while the underlying atlas texture remains unchanged.
In runtime testing with a 16384×16384 atlas, the initial readback took approximately 3.3 seconds. Subsequent Voxy renderer creation dropped from roughly 3.3 seconds to 21–51 ms.
The cache automatically invalidates when Minecraft replaces the atlas texture, such as during a resource reload.