Spike 24 - Policy + Clipmap Rings

Loading case tables and WebGPU...
FPS: - Chunk tris: - Seam tris: -
MC chunks: - HM chunks: - Sphere: -
Chunk verts: - Seam verts: - Overflow: -
Layout: near 64/32/16 chunks + far clipmap rings
Pipeline mode: Policy near-field + clipmap far-field
Near field uses HM/MC policy and seams. Far field uses static-center clipmap rings.