test(shader): Add ShaderComposer and WGSL asset validation tests (Task #26)

Implemented comprehensive unit tests for ShaderComposer and a validation test for production WGSL shader assets. This ensures the shader asset pipeline is robust and that all shaders contain required entry points and snippets. Also improved InitShaderComposer to be more robust during testing.

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diff --git a/PROJECT_CONTEXT.md b/PROJECT_CONTEXT.md
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 ## Project Roadmap
 
 ### Recently Completed
+- **Task #26: Shader Asset Testing & Validation**: Developed comprehensive tests for `ShaderComposer` and WGSL asset loading/composition. Added a shader validation test to ensure production assets are valid.
 - **Asset Pipeline Improvement**: Created a robust `gen_spectrograms.sh` script to automate the conversion of `.wav` and `.aif` files to `.spec` format, replacing the old, fragile script. Added 13 new drum and bass samples to the project.
 - **Build System Consolidation (Task #25)**: Modularized the build by creating subsystem libraries (audio, gpu, 3d, util, procedural) and implemented helper macros to reduce boilerplate in `CMakeLists.txt`. This improves build maintenance and prepares for future CRT replacement.
 - **Asset System Robustness**: Resolved "static initialization order fiasco" by wrapping the asset table in a "Construct On First Use" getter (`GetAssetRecordTable()`), ensuring assets are available during dynamic global initialization (e.g., shader strings).