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- Removed assets/final/ (legacy, superseded by workspaces)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

14 files changed, 0 insertions, 0 deletions

diff --git a/workspaces/test/assets/music/BASS_GUITAR_FEEL.spec b/workspaces/test/assets/music/BASS_GUITAR_FEEL.spec
deleted file mode 100644
index 54f49a6..0000000
--- a/workspaces/test/assets/music/BASS_GUITAR_FEEL.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/BASS_SYNTH_1.spec b/workspaces/test/assets/music/BASS_SYNTH_1.spec
deleted file mode 100644
index 33bc0a0..0000000
--- a/workspaces/test/assets/music/BASS_SYNTH_1.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/CRASH_DMX.spec b/workspaces/test/assets/music/CRASH_DMX.spec
deleted file mode 100644
index 45ee52d..0000000
--- a/workspaces/test/assets/music/CRASH_DMX.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/HIHAT_CLOSED_DMX.spec b/workspaces/test/assets/music/HIHAT_CLOSED_DMX.spec
deleted file mode 100644
index 8fce1d2..0000000
--- a/workspaces/test/assets/music/HIHAT_CLOSED_DMX.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/HIHAT_CLOSED_DUFF.spec b/workspaces/test/assets/music/HIHAT_CLOSED_DUFF.spec
deleted file mode 100644
index f738271..0000000
--- a/workspaces/test/assets/music/HIHAT_CLOSED_DUFF.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/HIHAT_CLOSED_ER_1.spec b/workspaces/test/assets/music/HIHAT_CLOSED_ER_1.spec
deleted file mode 100644
index bb03f5e..0000000
--- a/workspaces/test/assets/music/HIHAT_CLOSED_ER_1.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/KICK_606.spec b/workspaces/test/assets/music/KICK_606.spec
deleted file mode 100644
index 10af84a..0000000
--- a/workspaces/test/assets/music/KICK_606.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/KICK_90S_2.spec b/workspaces/test/assets/music/KICK_90S_2.spec
deleted file mode 100644
index 126409e..0000000
--- a/workspaces/test/assets/music/KICK_90S_2.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/RIDE_CUP_1.spec b/workspaces/test/assets/music/RIDE_CUP_1.spec
deleted file mode 100644
index 78867c1..0000000
--- a/workspaces/test/assets/music/RIDE_CUP_1.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/SNARE_808.spec b/workspaces/test/assets/music/SNARE_808.spec
deleted file mode 100644
index 2923c3c..0000000
--- a/workspaces/test/assets/music/SNARE_808.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/SNARE_909_TUNE_8.spec b/workspaces/test/assets/music/SNARE_909_TUNE_8.spec
deleted file mode 100644
index 4693c05..0000000
--- a/workspaces/test/assets/music/SNARE_909_TUNE_8.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/SNARE_BLUE_ROOM.spec b/workspaces/test/assets/music/SNARE_BLUE_ROOM.spec
deleted file mode 100644
index b24baa7..0000000
--- a/workspaces/test/assets/music/SNARE_BLUE_ROOM.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/SPLASH_GROUNDED.spec b/workspaces/test/assets/music/SPLASH_GROUNDED.spec
deleted file mode 100644
index a919be4..0000000
--- a/workspaces/test/assets/music/SPLASH_GROUNDED.spec
+++ /dev/null
diff --git a/workspaces/test/assets/music/SYNTH_BASS_DISTORT.spec b/workspaces/test/assets/music/SYNTH_BASS_DISTORT.spec
deleted file mode 100644
index 33bc0a0..0000000
--- a/workspaces/test/assets/music/SYNTH_BASS_DISTORT.spec
+++ /dev/null