Variable CLUSTER_LOD_FLOATSConst

Floats per cluster LOD record (48 bytes). Layout (matches the cull shader):

[0..3]   selfSphere.xyz, selfRadius      (f32)
[4..7]   parentSphere.xyz, parentRadius  (f32)
[8]      selfError    (f32)
[9]      parentError  (f32)
[10]     lod          (f32)
[11]     _pad
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