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, 30 deletions

diff --git a/common/shaders/ray_triangle.wgsl b/common/shaders/ray_triangle.wgsl
deleted file mode 100644
index ece823a..0000000
--- a/common/shaders/ray_triangle.wgsl
+++ /dev/null
@@ -1,30 +0,0 @@
-// This file is part of the 64k demo project.
-// Möller-Trumbore ray-triangle intersection algorithm.
-// Reference: "Fast, Minimum Storage Ray-Triangle Intersection"
-
-struct TriangleHit {
-  uv: vec2f,
-  z: f32,
-  N: vec3f,
-  hit: bool,
-};
-
-fn ray_triangle_intersection(
-  orig: vec3f,
-  dir: vec3f,
-  p0: vec3f,
-  p1: vec3f,
-  p2: vec3f
-) -> TriangleHit {
-  let d10 = p1 - p0;
-  let d20 = p2 - p0;
-  let N = cross(d10, d20);
-  let det = -dot(dir, N);
-  let invdet = 1.0 / det;
-  let d0 = orig - p0;
-  let nd = cross(d0, dir);
-  let uv = vec2f(dot(d20, nd), -dot(d10, nd)) * invdet;
-  let z = dot(d0, N) * invdet;
-  let hit = det > 0.0 && z >= 0.0 && uv.x >= 0.0 && uv.y >= 0.0 && (uv.x + uv.y) < 1.0;
-  return TriangleHit(uv, z, N, hit);
-}