simplify raytracer, fluid, sky and render code: air fog moved into the camera medium, sky colour computed only when read, single ao neighbour lookups, culling test before tint and ao, allocation-free fluid heights and flow angle, one fluid model lookup per cell, shared normal rotation and face fractions in the element intersector, unified side-face table, dead overloads/interface/enums and convenience constructors removed, comments trimmed

tools/EntityTestRender.java

@@ -250,7 +250,7 @@ public class EntityTestRender {
         loc.setDirection(center.clone().subtract(cam));
 
         List<Vector> rayMap = buildRayMap(loc, TW * SSAA, TH * SSAA);
-        RenderJob job = new RenderJob(world, rayMap, cam, TW, TH, sky, List.of(s));
+        RenderJob job = new RenderJob(world, rayMap, cam, TW, TH, sky, List.of(s), List.of(), List.of(), List.of());
         return renderer.execute(job);
     }