refactor: move common/shaders/ to src/shaders/

Relocates shared WGSL shaders under src/ where all source code lives,
eliminating the top-level common/ directory.

- Update asset references in workspaces/main/assets.txt and workspaces/test/assets.txt
- Update docs: PROJECT_CONTEXT.md, ARCHITECTURE.md, WORKSPACE_SYSTEM.md, SHADER_REUSE_INVESTIGATION.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/shaders/common_uniforms.wgsl b/src/shaders/common_uniforms.wgsl
new file mode 100644
index 0000000..5dc0251
--- /dev/null
+++ b/src/shaders/common_uniforms.wgsl
@@ -0,0 +1,25 @@
+struct CommonUniforms {
+    resolution: vec2f,      // Screen dimensions
+    aspect_ratio: f32,          // Width/height ratio
+    time: f32,                  // Physical time in seconds (unaffected by tempo)
+    beat_time: f32,             // Musical time in beats (absolute, tempo-scaled)
+    beat_phase: f32,            // Fractional beat (0.0-1.0 within current beat)
+    audio_intensity: f32,       // Audio peak for beat sync
+    _pad: f32,                  // Padding
+};
+struct GlobalUniforms {
+    view_proj: mat4x4f,
+    inv_view_proj: mat4x4f,
+    camera_pos_time: vec4f,
+    params: vec4f,
+    resolution: vec2f,
+};
+struct ObjectData {
+    model: mat4x4f,
+    inv_model: mat4x4f,
+    color: vec4f,
+    params: vec4f,
+};
+struct ObjectsBuffer {
+    objects: array<ObjectData>,
+};
\ No newline at end of file