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- Removed assets/final/ (legacy, superseded by workspaces)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, 159 deletions

diff --git a/assets/final/shaders/masked_cube.wgsl b/assets/final/shaders/masked_cube.wgsl
deleted file mode 100644
index 5e673a3..0000000
--- a/assets/final/shaders/masked_cube.wgsl
+++ /dev/null
@@ -1,159 +0,0 @@
-// Masked cube shader - based on renderer_3d.wgsl with mask sampling
-#include "common_uniforms"
-#include "math/common_utils"
-#include "math/sdf_utils"
-
-@group(0) @binding(0) var<uniform> globals: GlobalUniforms;
-@group(0) @binding(1) var<storage, read> object_data: ObjectsBuffer;
-@group(0) @binding(3) var noise_tex: texture_2d<f32>;
-@group(0) @binding(4) var noise_sampler: sampler;
-
-@group(1) @binding(0) var mask_tex: texture_2d<f32>;
-@group(1) @binding(1) var mask_sampler: sampler;
-
-struct VertexOutput {
-  @builtin(position) position: vec4<f32>,
-  @location(0) local_pos: vec3<f32>,
-  @location(1) color: vec4<f32>,
-  @location(2) @interpolate(flat) instance_index: u32,
-  @location(3) world_pos: vec3<f32>,
-  @location(4) transformed_normal: vec3<f32>,
-};
-
-@vertex
-fn vs_main(@builtin(vertex_index) vertex_index: u32,
-           @builtin(instance_index) instance_index: u32) -> VertexOutput {
-  var pos = array<vec3<f32>, 36>(
-    vec3(-1.0, -1.0,  1.0), vec3( 1.0, -1.0,  1.0), vec3( 1.0,  1.0,  1.0),
-    vec3(-1.0, -1.0,  1.0), vec3( 1.0,  1.0,  1.0), vec3(-1.0,  1.0,  1.0),
-    vec3(-1.0, -1.0, -1.0), vec3(-1.0,  1.0, -1.0), vec3( 1.0,  1.0, -1.0),
-    vec3(-1.0, -1.0, -1.0), vec3( 1.0,  1.0, -1.0), vec3( 1.0, -1.0, -1.0),
-    vec3(-1.0,  1.0, -1.0), vec3(-1.0,  1.0,  1.0), vec3( 1.0,  1.0,  1.0),
-    vec3(-1.0,  1.0, -1.0), vec3( 1.0,  1.0,  1.0), vec3( 1.0,  1.0, -1.0),
-    vec3(-1.0, -1.0, -1.0), vec3( 1.0, -1.0, -1.0), vec3( 1.0, -1.0,  1.0),
-    vec3(-1.0, -1.0, -1.0), vec3( 1.0, -1.0,  1.0), vec3(-1.0, -1.0,  1.0),
-    vec3( 1.0, -1.0, -1.0), vec3( 1.0,  1.0, -1.0), vec3( 1.0,  1.0,  1.0),
-    vec3( 1.0, -1.0, -1.0), vec3( 1.0,  1.0,  1.0), vec3( 1.0, -1.0,  1.0),
-    vec3(-1.0, -1.0, -1.0), vec3(-1.0, -1.0,  1.0), vec3(-1.0,  1.0,  1.0),
-    vec3(-1.0, -1.0, -1.0), vec3(-1.0,  1.0,  1.0), vec3(-1.0,  1.0, -1.0)
-  );
-
-  var p = pos[vertex_index];
-  let obj = object_data.objects[instance_index];
-  let world_pos = obj.model * vec4<f32>(p, 1.0);
-  let clip_pos = globals.view_proj * world_pos;
-
-  var out: VertexOutput;
-  out.position = clip_pos;
-  out.local_pos = p;
-  out.color = obj.color;
-  out.instance_index = instance_index;
-  out.world_pos = world_pos.xyz;
-  out.transformed_normal = normalize(vec3<f32>(0.0, 1.0, 0.0));
-
-  return out;
-}
-
-#include "render/scene_query_mode"
-#include "render/shadows"
-#include "render/lighting_utils"
-#include "ray_box"
-
-struct FragmentOutput {
-  @location(0) color: vec4<f32>,
-  @builtin(frag_depth) depth: f32,
-};
-
-@fragment
-fn fs_main(in: VertexOutput) -> FragmentOutput {
-  let screen_uv = in.position.xy / globals.resolution;
-  let mask_value = textureSample(mask_tex, mask_sampler, screen_uv).r;
-
-  if (mask_value < 0.5) {
-    discard;
-  }
-
-  let obj = object_data.objects[in.instance_index];
-  let obj_type = obj.params.x;
-
-  var p: vec3<f32>;
-  var normal: vec3<f32>;
-  var base_color = in.color.rgb;
-  let light_dir = normalize(vec3<f32>(1.0, 1.0, 1.0));
-
-  let ray_origin = globals.camera_pos_time.xyz;
-  let ray_dir = normalize(in.world_pos - ray_origin);
-  let inv_model = obj.inv_model;
-
-  let local_origin = (inv_model * vec4<f32>(ray_origin, 1.0)).xyz;
-  let local_dir = normalize((inv_model * vec4<f32>(ray_dir, 0.0)).xyz);
-
-  let bounds = ray_box_intersection(local_origin, local_dir, vec3<f32>(1.0));
-  if (!bounds.hit) {
-    discard;
-  }
-
-  let t_start = bounds.t_entry;
-  let t_end = bounds.t_exit;
-
-  var t_march = t_start;
-  let max_steps = 128;
-  var hit = false;
-  var local_p = vec3<f32>(0.0);
-
-  for (var step = 0; step < max_steps; step++) {
-    local_p = local_origin + t_march * local_dir;
-    let d = sdBox(local_p, vec3<f32>(1.0));
-
-    if (d < 0.001) {
-      hit = true;
-      break;
-    }
-
-    t_march += max(d * 0.5, 0.001);
-    if (t_march > t_end) {
-      break;
-    }
-  }
-
-  if (!hit) {
-    discard;
-  }
-
-  p = local_p;
-  let eps = 0.001;
-  normal = normalize(vec3<f32>(
-    sdBox(p + vec3<f32>(eps, 0.0, 0.0), vec3<f32>(1.0)) -
-    sdBox(p - vec3<f32>(eps, 0.0, 0.0), vec3<f32>(1.0)),
-    sdBox(p + vec3<f32>(0.0, eps, 0.0), vec3<f32>(1.0)) -
-    sdBox(p - vec3<f32>(0.0, eps, 0.0), vec3<f32>(1.0)),
-    sdBox(p + vec3<f32>(0.0, 0.0, eps), vec3<f32>(1.0)) -
-    sdBox(p - vec3<f32>(0.0, 0.0, eps), vec3<f32>(1.0))
-  ));
-
-  let world_p = (obj.model * vec4<f32>(p, 1.0)).xyz;
-  let world_normal = normalize((obj.model * vec4<f32>(normal, 0.0)).xyz);
-
-  let bump_strength = 0.3;
-  let bump_scale = 4.0;
-  let noise_uv = world_p.xy * bump_scale;
-  let noise_val = textureSample(noise_tex, noise_sampler, noise_uv).r;
-  let bump_offset = (noise_val - 0.5) * bump_strength;
-
-  let bumped_normal = normalize(world_normal + vec3<f32>(bump_offset));
-
-  let diffuse = max(dot(bumped_normal, light_dir), 0.0);
-  let ambient = 0.3;
-  let lighting = ambient + diffuse * 0.7;
-
-  let final_color = base_color * lighting;
-
-  let clip_p = globals.view_proj * vec4<f32>(world_p, 1.0);
-  let depth = clip_p.z / clip_p.w;
-
-  var out: FragmentOutput;
-  out.color = vec4<f32>(final_color, 1.0);
-  out.depth = depth;
-
-  return out;
-}