Refactor: Reorganize workspaces and remove assets/ directory

Workspace structure now:
- workspaces/{main,test}/obj/      (3D models)
- workspaces/{main,test}/shaders/  (WGSL shaders)
- workspaces/{main,test}/music/    (audio samples)

Changes:
- Moved workspaces/*/assets/music/ → workspaces/*/music/
- Updated assets.txt paths (assets/music/ → music/)
- Moved test_demo.{seq,track} to tools/
- Moved assets/originals/ → tools/originals/
- Removed assets/common/ (legacy, duplicated in workspaces)
- Removed assets/final/ (legacy, superseded by workspaces)
- Updated hot-reload paths in main.cc
- Updated CMake references for test_demo and validation
- Updated gen_spectrograms.sh paths

handoff(Claude): Workspace reorganization complete

1 files changed, 0 insertions, 32 deletions

diff --git a/assets/final/shaders/vignette.wgsl b/assets/final/shaders/vignette.wgsl
deleted file mode 100644
index b129883..0000000
--- a/assets/final/shaders/vignette.wgsl
+++ /dev/null
@@ -1,32 +0,0 @@
-@group(0) @binding(0) var input_sampler: sampler;
-@group(0) @binding(1) var input_tex: texture_2d<f32>;
-#include "common_uniforms"
-
-struct VignetteParams {
-  radius: f32,
-  softness: f32,
-};
-
-@group(0) @binding(2) var<uniform> common_uniforms: CommonUniforms;
-@group(0) @binding(3) var<uniform> params: VignetteParams;
-
-@vertex
-fn vs_main(@builtin(vertex_index) vertex_idx: u32) -> @builtin(position) vec4<f32> {
-  var pos = array<vec2<f32>, 3>(
-    vec2<f32>(-1.0, -1.0),
-    vec2<f32>(3.0, -1.0),
-    vec2<f32>(-1.0, 3.0)
-  );
-  return vec4<f32>(pos[vertex_idx], 0.0, 1.0);
-}
-
-@fragment
-fn fs_main(@builtin(position) pos: vec4<f32>) -> @location(0) vec4<f32> {
-  let uv = pos.xy / common_uniforms.resolution;
-  let color = textureSample(input_tex, input_sampler, uv);
-
-  let d = distance(uv, vec2<f32>(0.5, 0.5));
-  let vignette = smoothstep(params.radius, params.radius - params.softness, d);
-
-  return vec4<f32>(color.rgb * mix(1.0, vignette, common_uniforms.audio_intensity), color.a);
-}
\ No newline at end of file