Sunset Lake — HD 620 Iris Shader

A fresh shaderpack built for Iris + Sodium.
Design targets:
- natural daytime exposure (no blown white terrain)
- warm sunrise/sunset
- vanilla sun/moon textures at smaller scale
- moving water with the original water texture preserved
- subtle foliage wind
- dynamic 1024px shadow map
- low-cost volumetric sun shafts
- cinematic but restrained tone mapping

This pack intentionally avoids compute shaders, SSBOs, and heavy multi-pass effects.

Compatibility note:
The pack uses Iris-documented compatibility-profile GLSL 330 features, shadow buffers,
gbuffers_water/gbuffers_skytextured, and the documented world/system uniforms.
It has been statically checked here, but this environment cannot launch Minecraft + Iris
on an Intel HD Graphics 620, so real GPU compilation/performance remains unverified.
