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- Removed assets/final/ (legacy, superseded by workspaces)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