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- Removed assets/final/ (legacy, superseded by workspaces)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, 35 deletions

diff --git a/assets/final/shaders/particle_spray_compute.wgsl b/assets/final/shaders/particle_spray_compute.wgsl
deleted file mode 100644
index 4b6e48f..0000000
--- a/assets/final/shaders/particle_spray_compute.wgsl
+++ /dev/null
@@ -1,35 +0,0 @@
-struct Particle {
-    pos: vec4<f32>,
-    vel: vec4<f32>,
-    rot: vec4<f32>,
-    color: vec4<f32>,
-};
-
-#include "common_uniforms"
-
-@group(0) @binding(0) var<storage, read_write> particles: array<Particle>;
-@group(0) @binding(1) var<uniform> uniforms: CommonUniforms;
-
-fn hash(p: f32) -> f32 {
-    return fract(sin(p) * 43758.5453);
-}
-
-@compute @workgroup_size(64)
-fn main(@builtin(global_invocation_id) id: vec3<u32>) {
-    let i = id.x;
-    if (i >= arrayLength(&particles)) {
-        return;
-    }
-    var p = particles[i];
-    if (p.pos.w <= 0.0) {
-        let r = hash(f32(i) + uniforms.time);
-        let angle = r * 6.28318;
-        p.pos = vec4<f32>(0.0, 0.0, 0.0, 1.0);
-        p.vel = vec4<f32>(cos(angle), sin(angle), 0.0, 0.0) * (0.5 + hash(r) * 0.5) * (1.0 + uniforms.audio_intensity * 2.0);
-        p.color = vec4<f32>(hash(r + 0.1), hash(r + 0.2), 1.0, 1.0);
-    }
-    let new_pos = p.pos.xyz + p.vel.xyz * 0.016;
-    p.pos = vec4<f32>(new_pos, p.pos.w - 0.01 * (1.0 + uniforms.beat_phase));
-    p.vel.y = p.vel.y - 0.01;
-    particles[i] = p;
-}