Spike 22 - MC Chunk Fallback to Heightmap

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FPS: - Chunk tris: - Seam tris: -
MC chunks: - HM chunks: - Sphere: -
Chunk verts: - Seam verts: - Overflow: -
Layout: 64x64 | 32x32 / 32x32 | 16x16
Pipeline mode: Hybrid: MC when sphere intersects chunk, heightmap otherwise
Same heightmap + seams. Sphere out-of-bounds chunks skip MC draw and render static heightmap.