- The user hit "Sky Act1_ColdDusk: no cubemap" while rebuilding the Ploutonion.
- Cause: T_Sky_Act1_ColdDusk.png was imported as a 2D texture (textureShape 1), probably before ArtImportRules existed; that rule only acts on first import. Overcast was imported correctly as a cube.
- Fix: ArtWiring.Skybox now applies the import rule and re-imports any sky it finds flat, then retries. Compiled clean.