Lumina Shader - Lite

Final visual release candidate. This updates RC4 in place; no RC5 was created.

Fixed:

Removed the remaining fiber/curtain pattern caused by projecting pixel noise across the sky. Changed:

Uses Lumina’s existing smooth cloud texture for coherent galactic masses. Two independently rotated layers form the wide glow and irregular dust lane. Preserves the diagonal arc, cool outer haze, warm core and dark midnight background. Performance:

Reduced from three texture samples to two. No new assets, iterative noise loops or volumetric ray marching.