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-# Shader Composability Improvement
-
-## Created: `math/common_utils.wgsl`
-
-Common utility functions to reduce duplication:
-- `transform_normal()` - Normal matrix transform (was in 2 shaders)
-- `spherical_uv()` - Spherical UV mapping (was in 7+ places)
-- `spherical_uv_from_dir()` - For skybox/direction vectors
-- `calc_sdf_normal_bumped()` - Bump-mapped normal (36 lines → 1 call)
-- Constants: `PI`, `TAU`
-
-## Usage in Shaders
-
-### Bump Mapping Note:
-`calc_sdf_normal_bumped()` was removed from common_utils - too specialized, depends on `get_dist()` from scene_query snippets. Keep bump mapping inline in shaders that use it.
-
-### Transform Normal (appears in renderer_3d.wgsl:174, mesh_render.wgsl:38):
-```wgsl
-// Before
-let normal_matrix = mat3x3<f32>(obj.inv_model[0].xyz, obj.inv_model[1].xyz, obj.inv_model[2].xyz);
-normal = normalize(normal_matrix * n_local);
-
-// After (if common_utils included)
-normal = transform_normal(obj.inv_model, n_local);
-```
-
-### Spherical UV (appears 6x in renderer_3d.wgsl):
-```wgsl
-// Before
-let uv = vec2<f32>(atan2(q.x, q.z) / 6.28 + 0.5,
-                   acos(clamp(q.y / length(q), -1.0, 1.0)) / 3.14);
-
-// After
-let uv = spherical_uv(q);
-```
-
-### Skybox (skybox.wgsl:41-42):
-```wgsl
-// Before
-let u = atan2(ray_dir.z, ray_dir.x) / 6.28318 + 0.5;
-let v = asin(clamp(ray_dir.y, -1.0, 1.0)) / 3.14159 + 0.5;
-
-// After
-let uv = spherical_uv_from_dir(ray_dir);
-```
-
-## Integration with ShaderComposer
-
-ShaderComposer already supports `#include` directives. To use:
-
-```cpp
-// In gpu/effects initialization
-ShaderComposer::Get().RegisterSnippet(
-    "math/common_utils",
-    GetAssetString(AssetId::SHADER_MATH_COMMON_UTILS)
-);
-
-// In shader composition
-composer.Compose(
-    {"common_uniforms", "math/common_utils"},
-    main_shader_code
-);
-```
-
-## Size Impact
-
-**Estimated binary size change:**
-- Add common_utils.wgsl: +800 bytes
-- Remove duplication: -1500 bytes (6 spherical_uv + bump mapping)
-- **Net savings: ~700 bytes**
-
-Plus improved maintainability and consistency.
-
-## Next Steps
-
-1. Refactor `renderer_3d.wgsl` to use new utilities
-2. Refactor `skybox.wgsl` to use `spherical_uv_from_dir()`
-3. Refactor `mesh_render.wgsl` to use `transform_normal()`
-4. Consider extracting more patterns:
-   - Grid pattern (appears 2x)
-   - Light direction constant
-   - Ray-box intersection variants