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, 16 deletions

diff --git a/common/shaders/ray_box.wgsl b/common/shaders/ray_box.wgsl
deleted file mode 100644
index 37b9d6a..0000000
--- a/common/shaders/ray_box.wgsl
+++ /dev/null
@@ -1,16 +0,0 @@
-struct RayBounds {
-    t_entry: f32,
-    t_exit: f32,
-    hit: bool,
-};
-
-fn ray_box_intersection(ro: vec3f, rd: vec3f, extent: vec3f) -> RayBounds {
-    let inv_rd = 1.0 / rd;
-    let t0 = (-extent - ro) * inv_rd;
-    let t1 = (extent - ro) * inv_rd;
-    let tmin_vec = min(t0, t1);
-    let tmax_vec = max(t0, t1);
-    let t_entry = max(0.0, max(tmin_vec.x, max(tmin_vec.y, tmin_vec.z)));
-    let t_exit = min(tmax_vec.x, min(tmax_vec.y, tmax_vec.z));
-    return RayBounds(t_entry, t_exit, t_entry <= t_exit);
-}