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- Removed assets/final/ (legacy, superseded by workspaces)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, 16 deletions

diff --git a/assets/final/shaders/ray_box.wgsl b/assets/final/shaders/ray_box.wgsl
deleted file mode 100644
index d56ea1b..0000000
--- a/assets/final/shaders/ray_box.wgsl
+++ /dev/null
@@ -1,16 +0,0 @@
-struct RayBounds {
-    t_entry: f32,
-    t_exit: f32,
-    hit: bool,
-};
-
-fn ray_box_intersection(ro: vec3<f32>, rd: vec3<f32>, extent: vec3<f32>) -> RayBounds {
-    let inv_rd = 1.0 / rd;
-    let t0 = (-extent - ro) * inv_rd;
-    let t1 = (extent - ro) * inv_rd;
-    let tmin_vec = min(t0, t1);
-    let tmax_vec = max(t0, t1);
-    let t_entry = max(0.0, max(tmin_vec.x, max(tmin_vec.y, tmin_vec.z)));
-    let t_exit = min(tmax_vec.x, min(tmax_vec.y, tmax_vec.z));
-    return RayBounds(t_entry, t_exit, t_entry <= t_exit);
-}