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- Removed assets/final/ (legacy, superseded by workspaces)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, 52 deletions

diff --git a/assets/final/shaders/particle_render.wgsl b/assets/final/shaders/particle_render.wgsl
deleted file mode 100644
index 6a2b636..0000000
--- a/assets/final/shaders/particle_render.wgsl
+++ /dev/null
@@ -1,52 +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> particles: array<Particle>;
-@group(0) @binding(1) var<uniform> uniforms: CommonUniforms;
-
-struct VSOut {
-    @builtin(position) pos: vec4<f32>,
-    @location(0) color: vec4<f32>,
-    @location(1) uv: vec2<f32>,
-};
-
-@vertex fn vs_main(@builtin(vertex_index) vi: u32, @builtin(instance_index) ii: u32) -> VSOut {
-    let p = particles[ii];
-    let size = 0.02 + p.pos.z * 0.01 + uniforms.audio_intensity * 0.02;
-    var offsets = array<vec2<f32>, 6>(
-        vec2<f32>(-1, -1),
-        vec2<f32>(1, -1),
-        vec2<f32>(-1, 1),
-        vec2<f32>(-1, 1),
-        vec2<f32>(1, -1),
-        vec2<f32>(1, 1)
-    );
-    let offset = offsets[vi];
-    let c = cos(p.rot.x);
-    let s = sin(p.rot.x);
-    let rotated_offset = vec2<f32>(offset.x * c - offset.y * s, offset.x * s + offset.y * c);
-    let pos = vec2<f32>(p.pos.x + rotated_offset.x * size / uniforms.aspect_ratio, p.pos.y + rotated_offset.y * size);
-
-    // Fade based on lifetime (p.pos.w goes from 1.0 to 0.0)
-    let lifetime_fade = p.pos.w;
-    let color_with_fade = vec4<f32>(p.color.rgb * (0.5 + 0.5 * uniforms.audio_intensity), p.color.a * lifetime_fade);
-
-    return VSOut(vec4<f32>(pos, 0.0, 1.0), color_with_fade, offset);
-}
-
-@fragment fn fs_main(@location(0) color: vec4<f32>, @location(1) uv: vec2<f32>) -> @location(0) vec4<f32> {
-    // Calculate distance from center for circular shape
-    let dist = length(uv);
-
-    // Smooth circular falloff (1.0 at center, 0.0 at edge)
-    let circle_alpha = smoothstep(1.0, 0.5, dist);
-
-    // Apply circular fade to alpha channel
-    return vec4<f32>(color.rgb, color.a * circle_alpha);
-}