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- Removed assets/final/ (legacy, superseded by workspaces)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/test_mesh.obj b/assets/final/test_mesh.obj
deleted file mode 100644
index eb304d4..0000000
--- a/assets/final/test_mesh.obj
+++ /dev/null
@@ -1,30 +0,0 @@
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-v  0.5 -0.5 -0.5
-v  0.5  0.5 -0.5
-v -0.5  0.5 -0.5
-vn  0.0  0.0  1.0
-vn  0.0  0.0 -1.0
-vn  0.0  1.0  0.0
-vn  0.0 -1.0  0.0
-vn  1.0  0.0  0.0
-vn -1.0  0.0  0.0
-vt 0.0 0.0
-vt 1.0 0.0
-vt 1.0 1.0
-vt 0.0 1.0
-f 1/1/1 2/2/1 3/3/1
-f 1/1/1 3/3/1 4/4/1
-f 5/1/2 8/4/2 7/3/2
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-f 1/1/6 4/4/6 8/3/6
-f 1/1/6 8/3/6 5/2/6
-f 2/1/5 6/4/5 7/3/5
-f 2/1/5 7/3/5 3/2/5
-f 4/1/3 3/4/3 7/3/3
-f 4/1/3 7/3/3 8/2/3
-f 1/1/4 5/4/4 6/3/4
-f 1/1/4 6/3/4 2/2/4