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- Removed assets/final/ (legacy, superseded by workspaces)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

4 files changed, 0 insertions, 142 deletions

diff --git a/assets/common/shaders/render/lighting_utils.wgsl b/assets/common/shaders/render/lighting_utils.wgsl
deleted file mode 100644
index d2fd2e2..0000000
--- a/assets/common/shaders/render/lighting_utils.wgsl
+++ /dev/null
@@ -1,6 +0,0 @@
-fn calculate_lighting(color: vec3<f32>, normal: vec3<f32>, pos: vec3<f32>, shadow: f32) -> vec3<f32> {
-    let light_dir = normalize(vec3<f32>(1.0, 1.0, 1.0));
-    let diffuse = max(dot(normal, light_dir), 0.0);
-    let lighting = diffuse * (0.1 + 0.9 * shadow) + 0.1; // Ambient + Shadowed Diffuse
-    return color * lighting;
-}
diff --git a/assets/common/shaders/render/scene_query_bvh.wgsl b/assets/common/shaders/render/scene_query_bvh.wgsl
deleted file mode 100644
index 3e6f895..0000000
--- a/assets/common/shaders/render/scene_query_bvh.wgsl
+++ /dev/null
@@ -1,67 +0,0 @@
-#include "math/sdf_shapes"
-#include "math/sdf_utils"
-
-struct BVHNode {
-    min: vec3<f32>,
-    left_idx: i32,
-    max: vec3<f32>,
-    obj_idx_or_right: i32,
-};
-
-@group(0) @binding(2) var<storage, read> bvh_nodes: array<BVHNode>;
-
-fn get_dist(p: vec3<f32>, obj_params: vec4<f32>) -> f32 {
-    let obj_type = obj_params.x;
-    if (obj_type == 1.0) { return length(p) - 1.0; } // Unit Sphere
-    if (obj_type == 2.0) { return sdBox(p, vec3<f32>(1.0)); } // Unit Box
-    if (obj_type == 3.0) { return sdTorus(p, vec2<f32>(1.0, 0.4)); } // Unit Torus
-    if (obj_type == 4.0) { return sdPlane(p, vec3<f32>(0.0, 1.0, 0.0), 0.0); }
-    if (obj_type == 5.0) { return sdBox(p, obj_params.yzw); } // MESH AABB
-    return 100.0;
-}
-
-fn map_scene(p: vec3<f32>, skip_idx: u32) -> f32 {
-    var d = 1000.0;
-    var stack: array<i32, 32>;
-    var stack_ptr = 0;
-    
-    if (arrayLength(&bvh_nodes) > 0u) {
-        stack[stack_ptr] = 0;
-        stack_ptr++;
-    }
-
-    while (stack_ptr > 0) {
-        stack_ptr--;
-        let node_idx = stack[stack_ptr];
-        let node = bvh_nodes[node_idx];
-
-        if (aabb_sdf(p, node.min, node.max) < d) {
-            if (node.left_idx < 0) { // Leaf
-                let obj_idx = u32(node.obj_idx_or_right);
-                if (obj_idx == skip_idx) { continue; }
-                let obj = object_data.objects[obj_idx];
-                let q = (obj.inv_model * vec4<f32>(p, 1.0)).xyz;
-
-                // Extract scale factors from the model matrix
-                let sx = length(obj.model[0].xyz);
-                let sy = length(obj.model[1].xyz);
-                let sz = length(obj.model[2].xyz);
-                
-                var s = min(sx, min(sy, sz));
-                if (obj.params.x == 4.0) {
-                    s = sy; // Plane normal is (0,1,0) in local space
-                }
-                
-                d = min(d, get_dist(q, obj.params) * s);
-            } else { // Internal
-                if (stack_ptr < 31) {
-                    stack[stack_ptr] = node.left_idx;
-                    stack_ptr++;
-                    stack[stack_ptr] = node.obj_idx_or_right;
-                    stack_ptr++;
-                }
-            }
-        }
-    }
-    return d;
-}
diff --git a/assets/common/shaders/render/scene_query_linear.wgsl b/assets/common/shaders/render/scene_query_linear.wgsl
deleted file mode 100644
index 0497a40..0000000
--- a/assets/common/shaders/render/scene_query_linear.wgsl
+++ /dev/null
@@ -1,56 +0,0 @@
-#include "math/sdf_shapes"
-#include "math/sdf_utils"
-
-fn get_dist(p: vec3<f32>, obj_params: vec4<f32>) -> f32 {
-    let obj_type = obj_params.x;
-    if (obj_type == 1.0) { return length(p) - 1.0; } // Unit Sphere
-    if (obj_type == 2.0) { return sdBox(p, vec3<f32>(1.0)); } // Unit Box
-    if (obj_type == 3.0) { return sdTorus(p, vec2<f32>(1.0, 0.4)); } // Unit Torus
-    if (obj_type == 4.0) { return sdPlane(p, vec3<f32>(0.0, 1.0, 0.0), 0.0); }
-    if (obj_type == 5.0) { return sdBox(p, obj_params.yzw); } // MESH AABB
-    return 100.0;
-}
-
-fn map_scene(p: vec3<f32>, skip_idx: u32) -> f32 {
-
-    var d = 1000.0;
-
-    let num_objects = arrayLength(&object_data.objects);
-
-    for (var i = 0u; i < num_objects; i++) {
-
-        if (i == skip_idx) { continue; }
-
-        let obj = object_data.objects[i];
-
-        let q = (obj.inv_model * vec4<f32>(p, 1.0)).xyz;
-
-        
-
-        // Extract scale factors from the model matrix
-
-        let sx = length(obj.model[0].xyz);
-
-        let sy = length(obj.model[1].xyz);
-
-        let sz = length(obj.model[2].xyz);
-
-        
-
-        var s = min(sx, min(sy, sz));
-
-        if (obj.params.x == 4.0) {
-
-            s = sy; // Plane normal is (0,1,0) in local space
-
-        }
-
-        
-
-        d = min(d, get_dist(q, obj.params) * s);
-
-    }
-
-    return d;
-
-}
diff --git a/assets/common/shaders/render/shadows.wgsl b/assets/common/shaders/render/shadows.wgsl
deleted file mode 100644
index 7cba089..0000000
--- a/assets/common/shaders/render/shadows.wgsl
+++ /dev/null
@@ -1,13 +0,0 @@
-fn calc_shadow(ro: vec3<f32>, rd: vec3<f32>, tmin: f32, tmax: f32, skip_idx: u32) -> f32 {
-    var res = 1.0;
-    var t = tmin;
-    if (t < 0.05) { t = 0.05; } 
-    for (var i = 0; i < 32; i = i + 1) {
-        let h = map_scene(ro + rd * t, skip_idx);
-        if (h < 0.001) { return 0.0; }
-        res = min(res, 16.0 * h / t); 
-        t = t + clamp(h, 0.02, 0.4);
-        if (t > tmax) { break; }
-    }
-    return clamp(res, 0.0, 1.0);
-}