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- Removed assets/final/ (legacy, superseded by workspaces)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, 30 deletions

diff --git a/assets/final/shaders/circle_mask_render.wgsl b/assets/final/shaders/circle_mask_render.wgsl
deleted file mode 100644
index cfa002e..0000000
--- a/assets/final/shaders/circle_mask_render.wgsl
+++ /dev/null
@@ -1,30 +0,0 @@
-// Circle mask render shader
-// Samples mask and draws green outside the circle
-
-@group(0) @binding(0) var mask_tex: texture_2d<f32>;
-@group(0) @binding(1) var mask_sampler: sampler;
-
-#include "common_uniforms"
-
-@group(0) @binding(2) var<uniform> uniforms: CommonUniforms;
-
-struct VSOutput {
-  @builtin(position) position: vec4<f32>,
-};
-
-@vertex fn vs_main(@builtin(vertex_index) i: u32) -> VSOutput {
-  var pos = array<vec2<f32>, 3>(
-    vec2<f32>(-1, -1), vec2<f32>(3, -1), vec2<f32>(-1, 3));
-  return VSOutput(vec4<f32>(pos[i], 0.0, 1.0));
-}
-
-@fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
-  let uv = p.xy / uniforms.resolution;
-  let mask_value = textureSample(mask_tex, mask_sampler, uv).r;
-
-  if (mask_value > 0.5) {
-    discard;
-  }
-
-  return vec4<f32>(0.0, 1.0, 0.0, 1.0);
-}