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- Removed assets/final/ (legacy, superseded by workspaces)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, 44 deletions

diff --git a/assets/final/shaders/compute/gen_perlin.wgsl b/assets/final/shaders/compute/gen_perlin.wgsl
deleted file mode 100644
index 73816d6..0000000
--- a/assets/final/shaders/compute/gen_perlin.wgsl
+++ /dev/null
@@ -1,44 +0,0 @@
-// GPU procedural Perlin noise texture generator.
-// Fractional Brownian Motion using value noise.
-
-#include "math/noise"
-
-struct PerlinParams {
-  width: u32,
-  height: u32,
-  seed: f32,
-  frequency: f32,
-  amplitude: f32,
-  amplitude_decay: f32,
-  octaves: u32,
-  _pad0: f32,  // Padding for alignment
-}
-
-@group(0) @binding(0) var output_tex: texture_storage_2d<rgba8unorm, write>;
-@group(0) @binding(1) var<uniform> params: PerlinParams;
-
-@compute @workgroup_size(8, 8, 1)
-fn main(@builtin(global_invocation_id) id: vec3<u32>) {
-  if (id.x >= params.width || id.y >= params.height) { return; }
-
-  let uv = vec2<f32>(f32(id.x) / f32(params.width),
-                      f32(id.y) / f32(params.height));
-
-  var value = 0.0;
-  var amplitude = params.amplitude;
-  var frequency = params.frequency;
-  var total_amp = 0.0;
-
-  for (var o: u32 = 0u; o < params.octaves; o++) {
-    let p = uv * frequency + params.seed;
-    value += noise_2d(p) * amplitude;
-    total_amp += amplitude;
-    frequency *= 2.0;
-    amplitude *= params.amplitude_decay;
-  }
-
-  value /= total_amp;
-  let clamped = clamp(value, 0.0, 1.0);
-
-  textureStore(output_tex, id.xy, vec4<f32>(clamped, clamped, clamped, 1.0));
-}