Remediation: Implement shared common/shaders/ directory

Eliminates 36 duplicate shader files across workspaces.

Structure:
- common/shaders/{math,render,compute}/ - Shared utilities (20 files)
- workspaces/*/shaders/ - Workspace-specific only

Changes:
- Created common/shaders/ with math, render, compute subdirectories
- Moved 20 common shaders from workspaces to common/
- Removed duplicates from test workspace
- Updated assets.txt: ../../common/shaders/ references
- Enhanced asset_packer.cc: filesystem path normalization for ../ resolution

Implementation: Option 1 from SHADER_REUSE_INVESTIGATION.md
- Single source of truth for common code
- Workspace references via relative paths
- Path normalization in asset packer

handoff(Claude): Common shader directory implemented

1 files changed, 0 insertions, 56 deletions

diff --git a/workspaces/test/shaders/render/scene_query_linear.wgsl b/workspaces/test/shaders/render/scene_query_linear.wgsl
deleted file mode 100644
index 0497a40..0000000
--- a/workspaces/test/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;
-
-}