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- Removed assets/final/ (legacy, superseded by workspaces)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, 149 deletions

diff --git a/assets/music.track b/assets/music.track
deleted file mode 100644
index c5b953b..0000000
--- a/assets/music.track
+++ /dev/null
@@ -1,149 +0,0 @@
-# Simple Demo Track - Steady beat with progressive variation
-# Duration: 32 seconds (16 units at 120 BPM)
-#
-# Structure:
-# - Steady kick + snare throughout
-# - Snare sample varies every 4s
-# - Kick sample varies every 8s
-# - Ride added after 16s
-#
-# TIMING: Unit-less (1 unit = 4 beats at 120 BPM = 2 seconds)
-
-BPM 120
-
-SAMPLE ASSET_KICK_1
-SAMPLE ASSET_KICK_2
-SAMPLE ASSET_SNARE_1
-SAMPLE ASSET_SNARE_2
-SAMPLE ASSET_SNARE_3
-SAMPLE ASSET_RIDE_1
-
-# === KICK PATTERNS ===
-# Steady kick on beats 0 and 2 (quarter notes)
-PATTERN kick_1 LENGTH 1.0
-  0.00, ASSET_KICK_1, 1.0, 0.0
-  0.50, ASSET_KICK_1, 1.0, 0.0
-
-PATTERN kick_2 LENGTH 1.0
-  0.00, ASSET_KICK_2, 1.0, 0.0
-  0.50, ASSET_KICK_2, 1.0, 0.0
-
-# === SNARE PATTERNS ===
-# Steady snare on beats 1 and 3 (backbeat)
-PATTERN snare_1 LENGTH 1.0
-  0.25, ASSET_SNARE_1, 1.0, 0.0
-  0.75, ASSET_SNARE_1, 1.0, 0.0
-
-PATTERN snare_2 LENGTH 1.0
-  0.25, ASSET_SNARE_2, 1.0, 0.0
-  0.75, ASSET_SNARE_2, 1.0, 0.0
-
-PATTERN snare_3 LENGTH 1.0
-  0.25, ASSET_SNARE_3, 1.0, 0.0
-  0.75, ASSET_SNARE_3, 1.0, 0.0
-
-# === RIDE PATTERN ===
-# Ride cymbal on every beat (quarter notes)
-PATTERN ride LENGTH 1.0
-  0.00, ASSET_RIDE_1, 0.7, 0.2
-  0.25, ASSET_RIDE_1, 0.6, 0.2
-  0.50, ASSET_RIDE_1, 0.7, 0.2
-  0.75, ASSET_RIDE_1, 0.6, 0.2
-
-# === SCORE ===
-SCORE
-# 0-4s (0-2 units): KICK_1 + SNARE_1
-  0.00, kick_1
-  0.00, snare_1
-  0.50, kick_1
-  0.50, snare_1
-  1.00, kick_1
-  1.00, snare_1
-  1.50, kick_1
-  1.50, snare_1
-
-# 4-8s (2-4 units): KICK_1 + SNARE_2
-  2.00, kick_1
-  2.00, snare_2
-  2.50, kick_1
-  2.50, snare_2
-  3.00, kick_1
-  3.00, snare_2
-  3.50, kick_1
-  3.50, snare_2
-
-# 8-12s (4-6 units): KICK_2 + SNARE_3
-  4.00, kick_2
-  4.00, snare_3
-  4.50, kick_2
-  4.50, snare_3
-  5.00, kick_2
-  5.00, snare_3
-  5.50, kick_2
-  5.50, snare_3
-
-# 12-16s (6-8 units): KICK_2 + SNARE_1
-  6.00, kick_2
-  6.00, snare_1
-  6.50, kick_2
-  6.50, snare_1
-  7.00, kick_2
-  7.00, snare_1
-  7.50, kick_2
-  7.50, snare_1
-
-# 16-20s (8-10 units): KICK_1 + SNARE_2 + RIDE
-  8.00, kick_1
-  8.00, snare_2
-  8.00, ride
-  8.50, kick_1
-  8.50, snare_2
-  8.50, ride
-  9.00, kick_1
-  9.00, snare_2
-  9.00, ride
-  9.50, kick_1
-  9.50, snare_2
-  9.50, ride
-
-# 20-24s (10-12 units): KICK_2 + SNARE_3 + RIDE
-  10.00, kick_2
-  10.00, snare_3
-  10.00, ride
-  10.50, kick_2
-  10.50, snare_3
-  10.50, ride
-  11.00, kick_2
-  11.00, snare_3
-  11.00, ride
-  11.50, kick_2
-  11.50, snare_3
-  11.50, ride
-
-# 24-28s (12-14 units): KICK_1 + SNARE_1 + RIDE
-  12.00, kick_1
-  12.00, snare_1
-  12.00, ride
-  12.50, kick_1
-  12.50, snare_1
-  12.50, ride
-  13.00, kick_1
-  13.00, snare_1
-  13.00, ride
-  13.50, kick_1
-  13.50, snare_1
-  13.50, ride
-
-# 28-32s (14-16 units): KICK_2 + SNARE_2 + RIDE
-  14.00, kick_2
-  14.00, snare_2
-  14.00, ride
-  14.50, kick_2
-  14.50, snare_2
-  14.50, ride
-  15.00, kick_2
-  15.00, snare_2
-  15.00, ride
-  15.50, kick_2
-  15.50, snare_2
-  15.50, ride