feat(3d): Implement Task 21.1 WGSL Library & Composer

- Implemented ShaderComposer for modular WGSL snippet management.
- Factored out common math, primitives, lighting, and ray-box helpers.
- Refactored Renderer3D to use dynamic shader composition.
- Consolidated high-DPI and shadow robustness fixes into final shader structure.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gpu/gpu.cc b/src/gpu/gpu.cc
index 3e8981c..a779aa6 100644
--- a/src/gpu/gpu.cc
+++ b/src/gpu/gpu.cc
@@ -374,6 +374,8 @@ void gpu_init(PlatformState* platform_state) {
   g_main_sequence.init(g_device, g_queue, g_config.format,
                        platform_state->width, platform_state->height);
 
+  InitShaderComposer();
+
   LoadTimeline(g_main_sequence, g_device, g_queue, g_config.format);
 }