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- Removed assets/final/ (legacy, superseded by workspaces)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, 14 deletions

diff --git a/assets/final/shaders/math/sdf_shapes.wgsl b/assets/final/shaders/math/sdf_shapes.wgsl
deleted file mode 100644
index 31bbe2d..0000000
--- a/assets/final/shaders/math/sdf_shapes.wgsl
+++ /dev/null
@@ -1,14 +0,0 @@
-fn sdSphere(p: vec3<f32>, r: f32) -> f32 {
-    return length(p) - r;
-}
-fn sdBox(p: vec3<f32>, b: vec3<f32>) -> f32 {
-    let q = abs(p) - b;
-    return length(max(q, vec3<f32>(0.0))) + min(max(q.x, max(q.y, q.z)), 0.0);
-}
-fn sdTorus(p: vec3<f32>, t: vec2<f32>) -> f32 {
-    let q = vec2<f32>(length(p.xz) - t.x, p.y);
-    return length(q) - t.y;
-}
-fn sdPlane(p: vec3<f32>, n: vec3<f32>, h: f32) -> f32 {
-  return dot(p, n) + h;
-}