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, 23 insertions, 0 deletions

diff --git a/src/shaders/combined_postprocess.wgsl b/src/shaders/combined_postprocess.wgsl
new file mode 100644
index 0000000..c0acfe7
--- /dev/null
+++ b/src/shaders/combined_postprocess.wgsl
@@ -0,0 +1,23 @@
+// Example: Combined post-process using inline functions
+// Demonstrates how to chain multiple simple effects without separate classes
+
+#include "sequence_uniforms"
+#include "postprocess_inline"
+#include "render/fullscreen_uv_vs"  // <- VertexOutput + vs_main
+
+@group(0) @binding(0) var input_sampler: sampler;
+@group(0) @binding(1) var input_texture: texture_2d<f32>;
+@group(0) @binding(2) var<uniform> uniforms: UniformsSequenceParams;
+
+@fragment fn fs_main(in: VertexOutput) -> @location(0) vec4f {
+    // Sample base color
+    var color = textureSample(input_texture, input_sampler, in.uv);
+    
+    // Apply effects in sequence (customize as needed)
+    // color = apply_solarize(color, 0.4, 0.4, uniforms.time);
+    // color = apply_theme(color, vec3f(1.0, 0.8, 0.6), 0.3);
+    color = apply_vignette(color, in.uv, 0.6, 0.1, uniforms.audio_intensity);
+    // color = apply_flash(color, uniforms.beat_phase * 0.2);
+    
+    return color;
+}