Add GGX multiscatter compensation with Cycles albedo method#697

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mrdoob wants to merge 3 commits intogkjohnson:mainfrom

mrdoob:claude/implement-multiscattering-011CURRGomr2fhyhcb7NSCm1

Commits on Oct 24, 2025

Add explicit microsurface multiscattering for GGX BRDF
claude
committed

Commits on Oct 25, 2025

Fix GGX multiscatter energy conservation with analytical compensation.
mrdoob
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Implement GGX multiscatter energy compensation using Cycles approach
mrdoob
committed