refactor: move common/shaders/ to src/shaders/

Relocates shared WGSL shaders under src/ where all source code lives,
eliminating the top-level common/ directory.

- Update asset references in workspaces/main/assets.txt and workspaces/test/assets.txt
- Update docs: PROJECT_CONTEXT.md, ARCHITECTURE.md, WORKSPACE_SYSTEM.md, SHADER_REUSE_INVESTIGATION.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 0 insertions, 24 deletions

diff --git a/common/shaders/skybox.wgsl b/common/shaders/skybox.wgsl
deleted file mode 100644
index 075eeb6..0000000
--- a/common/shaders/skybox.wgsl
+++ /dev/null
@@ -1,24 +0,0 @@
-#include "common_uniforms"
-#include "math/common_utils"
-#include "render/fullscreen_uv_vs"  // <- VertexOutput + vs_main
-
-@group(0) @binding(0) var sky_tex: texture_2d<f32>;
-@group(0) @binding(1) var sky_sampler: sampler;
-@group(0) @binding(2) var<uniform> globals: GlobalUniforms;
-
-@fragment
-fn fs_main(in: VertexOutput) -> @location(0) vec4f {
-    // Convert UV to NDC
-    let ndc_x = in.uv.x * 2.0 - 1.0;
-    let ndc_y = (1.0 - in.uv.y) * 2.0 - 1.0; // Un-flip Y for NDC (Y-up)
-    
-    // Unproject to find world direction
-    // We want the direction from camera to the far plane at this pixel
-    let clip_pos = vec4f(ndc_x, ndc_y, 1.0, 1.0);
-    let world_pos_h = globals.inv_view_proj * clip_pos;
-    let world_pos = world_pos_h.xyz / world_pos_h.w;
-    
-    let ray_dir = normalize(world_pos - globals.camera_pos_time.xyz);
-    let uv = spherical_uv_from_dir(ray_dir);
-    return textureSample(sky_tex, sky_sampler, uv);
-}
\ No newline at end of file