ShadowCasterMaterial and CutoutShadowCasterMaterial get one warm rig each (production attribute
sets, layers 0+31: the world camera mints the forward pipeline, a live sun rig's shadow views the
depth one). The cutout pair (MAY_DISCARD opaque + prepass) otherwise first compiles when the first
leaf card enters sun-rig reach, after the cover lifts. Fixes the failing
pipe_warm::menagerie::every_material_lane_has_a_warm_contributor census for real.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
