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- Removed assets/final/ (legacy, superseded by workspaces)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, 13 deletions

diff --git a/assets/common/shaders/render/shadows.wgsl b/assets/common/shaders/render/shadows.wgsl
deleted file mode 100644
index 7cba089..0000000
--- a/assets/common/shaders/render/shadows.wgsl
+++ /dev/null
@@ -1,13 +0,0 @@
-fn calc_shadow(ro: vec3<f32>, rd: vec3<f32>, tmin: f32, tmax: f32, skip_idx: u32) -> f32 {
-    var res = 1.0;
-    var t = tmin;
-    if (t < 0.05) { t = 0.05; } 
-    for (var i = 0; i < 32; i = i + 1) {
-        let h = map_scene(ro + rd * t, skip_idx);
-        if (h < 0.001) { return 0.0; }
-        res = min(res, 16.0 * h / t); 
-        t = t + clamp(h, 0.02, 0.4);
-        if (t > tmax) { break; }
-    }
-    return clamp(res, 0.0, 1.0);
-}