test_refinement_gpu (incl. PeriodicPatchStepper alias calls), test_channel_root_gpu, test_fine_surface_gpu, test_shifted_remap_gpu, test_runtime_child_remap_gpu and test_refinement_three_level_multipatch_gpu pass refinements/level_* lists; scalar and set children map to the second refinement entry exactly as _legacy_levels did. Assertions unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>