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- Removed assets/final/ (legacy, superseded by workspaces)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, 31 deletions

diff --git a/assets/final/shaders/visual_debug.wgsl b/assets/final/shaders/visual_debug.wgsl
deleted file mode 100644
index 63e1f13..0000000
--- a/assets/final/shaders/visual_debug.wgsl
+++ /dev/null
@@ -1,31 +0,0 @@
-struct GlobalUniforms {
-    view_proj: mat4x4<f32>,
-    inv_view_proj: mat4x4<f32>,
-    camera_pos_time: vec4<f32>,
-    params: vec4<f32>,
-    resolution: vec2<f32>,
-};
-@group(0) @binding(0) var<uniform> uniforms : GlobalUniforms;
-
-struct VertexInput {
-    @location(0) position : vec3<f32>,
-    @location(1) color : vec3<f32>,
-}
-
-struct VertexOutput {
-    @builtin(position) position : vec4<f32>,
-    @location(0) color : vec3<f32>,
-}
-
-@vertex
-fn vs_main(in : VertexInput) -> VertexOutput {
-    var out : VertexOutput;
-    out.position = uniforms.view_proj * vec4<f32>(in.position, 1.0);
-    out.color = in.color;
-    return out;
-}
-
-@fragment
-fn fs_main(in : VertexOutput) -> @location(0) vec4<f32> {
-    return vec4<f32>(in.color, 1.0);
-}