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- Removed assets/final/ (legacy, superseded by workspaces)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, 36 deletions

diff --git a/assets/test_demo.track b/assets/test_demo.track
deleted file mode 100644
index 6ae5c67..0000000
--- a/assets/test_demo.track
+++ /dev/null
@@ -1,36 +0,0 @@
-# Minimal drum beat for audio/visual sync testing
-# Pattern: kick-snare-kick-snare, crash every 4th bar
-# Includes NOTE_A4 (440 Hz) at start of each bar for testing
-#
-# TIMING: Unit-less (1 unit = 4 beats at 120 BPM = 2 seconds)
-# Pattern events use unit-less time (0.0-1.0 for 4-beat pattern)
-# Score triggers use unit-less time
-
-SAMPLE ASSET_KICK_1
-SAMPLE ASSET_SNARE_1
-SAMPLE ASSET_CRASH_1
-
-PATTERN drums_basic LENGTH 1.0
-  0.00, ASSET_KICK_1, 1.0, 0.0
-  0.00, NOTE_A4, 0.5, 0.0
-  0.25, ASSET_SNARE_1, 0.9, 0.0
-  0.50, ASSET_KICK_1, 1.0, 0.0
-  0.75, ASSET_SNARE_1, 0.9, 0.0
-
-PATTERN drums_with_crash LENGTH 1.0
-  0.00, ASSET_KICK_1, 1.0, 0.0
-  0.00, ASSET_CRASH_1, 0.85, 0.0
-  0.00, NOTE_A4, 0.5, 0.0
-  0.25, ASSET_SNARE_1, 0.9, 0.0
-  0.50, ASSET_KICK_1, 1.0, 0.0
-  0.75, ASSET_SNARE_1, 0.9, 0.0
-
-SCORE
-  0.0, drums_basic
-  1.0, drums_basic
-  2.0, drums_with_crash
-  3.0, drums_basic
-  4.0, drums_basic
-  5.0, drums_basic
-  6.0, drums_with_crash
-  7.0, drums_basic