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, 12 insertions, 0 deletions

diff --git a/src/shaders/sequence_uniforms.wgsl b/src/shaders/sequence_uniforms.wgsl
new file mode 100644
index 0000000..1aef34e
--- /dev/null
+++ b/src/shaders/sequence_uniforms.wgsl
@@ -0,0 +1,12 @@
+// Sequence v2 uniform structure for WGSL shaders
+// Matches UniformsSequenceParams in sequence.h
+
+struct UniformsSequenceParams {
+    resolution: vec2f,
+    aspect_ratio: f32,
+    time: f32,
+    beat_time: f32,
+    beat_phase: f32,
+    audio_intensity: f32,
+    noise: f32,
+};