nx_world_cloud_transport_t155.nx

Private coherent cloud transport qualification; canonical density/terrain/cast unchanged. Relative scene radiance is reconstructed by inverse of nx_tonemap_aces Q10 rational fit plus nx_atmosphere sqrt convention. This cannot recover clipped physical energy. Palette1 is representative primary-land albedo, not measured hemispheric irradiance. Solar irradiance uses existing solar display reference and Lambertian pi convention; coefficients remain relative artistic inputs. Two scattering octaves (half extinction, half contribution, half anisotropy) approximate higher orders, not a path-traced solution. One cloud tone/display encode after linear composite. Incumbent final world grade remains downstream.