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, 147 deletions

diff --git a/common/shaders/math/noise.wgsl b/common/shaders/math/noise.wgsl
deleted file mode 100644
index dd97e02..0000000
--- a/common/shaders/math/noise.wgsl
+++ /dev/null
@@ -1,147 +0,0 @@
-// Random number generation and noise functions for WGSL shaders.
-// Collection of hash functions and noise generators.
-
-// ============================================
-// Hash Functions (Float Input)
-// ============================================
-
-// Hash: f32 -> f32
-// Fast fractional hash for floats
-fn hash_1f(x: f32) -> f32 {
-  var v = fract(x * 0.3351);
-  v *= v + 33.33;
-  v *= v + v;
-  return fract(v);
-}
-
-// Hash: vec2f -> f32
-// 2D coordinate to single hash value
-fn hash_2f(p: vec2f) -> f32 {
-  var h = dot(p, vec2f(127.1, 311.7));
-  return fract(sin(h) * 43758.5453123);
-}
-
-// Hash: vec2f -> vec2f
-// 2D coordinate to 2D hash (from Shadertoy 4djSRW)
-fn hash_2f_2f(p: vec2f) -> vec2f {
-  var p3 = fract(vec3f(p.x, p.y, p.x) * vec3f(0.1021, 0.1013, 0.0977));
-  p3 += dot(p3, p3.yzx + 33.33);
-  return fract((p3.xx + p3.yz) * p3.zy);
-}
-
-// Hash: vec3f -> f32
-// 3D coordinate to single hash value
-fn hash_3f(p: vec3f) -> f32 {
-  var h = dot(p, vec3f(127.1, 311.7, 74.7));
-  return fract(sin(h) * 43758.5453123);
-}
-
-// Hash: vec3f -> vec3f
-// 3D coordinate to 3D hash
-fn hash_3f_3f(p: vec3f) -> vec3f {
-  var v = fract(p);
-  v += dot(v, v.yxz + 32.41);
-  return fract((v.xxy + v.yzz) * v.zyx);
-}
-
-// ============================================
-// Hash Functions (Integer Input)
-// ============================================
-
-// Hash: u32 -> f32
-// Integer hash with bit operations (high quality)
-fn hash_1u(p: u32) -> f32 {
-  var P = (p << 13u) ^ p;
-  P = P * (P * P * 15731u + 789221u) + 1376312589u;
-  return bitcast<f32>((P >> 9u) | 0x3f800000u) - 1.0;
-}
-
-// Hash: u32 -> vec2f
-fn hash_1u_2f(p: u32) -> vec2f {
-  return vec2f(hash_1u(p), hash_1u(p + 1423u));
-}
-
-// Hash: u32 -> vec3f
-fn hash_1u_3f(p: u32) -> vec3f {
-  return vec3f(hash_1u(p), hash_1u(p + 1423u), hash_1u(p + 124453u));
-}
-
-// ============================================
-// Noise Functions
-// ============================================
-
-// Value Noise: 2D
-// Interpolated grid noise using smoothstep
-fn noise_2d(p: vec2f) -> f32 {
-  let i = floor(p);
-  let f = fract(p);
-  let u = f * f * (3.0 - 2.0 * f);
-  let n0 = hash_2f(i + vec2f(0.0, 0.0));
-  let n1 = hash_2f(i + vec2f(1.0, 0.0));
-  let n2 = hash_2f(i + vec2f(0.0, 1.0));
-  let n3 = hash_2f(i + vec2f(1.0, 1.0));
-  let ix0 = mix(n0, n1, u.x);
-  let ix1 = mix(n2, n3, u.x);
-  return mix(ix0, ix1, u.y);
-}
-
-// Value Noise: 3D
-fn noise_3d(p: vec3f) -> f32 {
-  let i = floor(p);
-  let f = fract(p);
-  let u = f * f * (3.0 - 2.0 * f);
-  let n000 = hash_3f(i + vec3f(0.0, 0.0, 0.0));
-  let n100 = hash_3f(i + vec3f(1.0, 0.0, 0.0));
-  let n010 = hash_3f(i + vec3f(0.0, 1.0, 0.0));
-  let n110 = hash_3f(i + vec3f(1.0, 1.0, 0.0));
-  let n001 = hash_3f(i + vec3f(0.0, 0.0, 1.0));
-  let n101 = hash_3f(i + vec3f(1.0, 0.0, 1.0));
-  let n011 = hash_3f(i + vec3f(0.0, 1.0, 1.0));
-  let n111 = hash_3f(i + vec3f(1.0, 1.0, 1.0));
-  let ix00 = mix(n000, n100, u.x);
-  let ix10 = mix(n010, n110, u.x);
-  let ix01 = mix(n001, n101, u.x);
-  let ix11 = mix(n011, n111, u.x);
-  let iy0 = mix(ix00, ix10, u.y);
-  let iy1 = mix(ix01, ix11, u.y);
-  return mix(iy0, iy1, u.z);
-}
-
-// ============================================
-// Special Functions
-// ============================================
-
-// Gyroid function (periodic triply-orthogonal minimal surface)
-// Useful for procedural patterns and cellular structures
-fn gyroid(p: vec3f) -> f32 {
-  return abs(0.04 + dot(sin(p), cos(p.zxy)));
-}
-
-// Fractional Brownian Motion (FBM) 2D
-// Multi-octave noise for natural-looking variation
-fn fbm_2d(p: vec2f, octaves: i32) -> f32 {
-  var value = 0.0;
-  var amplitude = 0.5;
-  var frequency = 1.0;
-  var pos = p;
-  for (var i = 0; i < octaves; i++) {
-    value += amplitude * noise_2d(pos * frequency);
-    frequency *= 2.0;
-    amplitude *= 0.5;
-  }
-  return value;
-}
-
-// Fractional Brownian Motion (FBM) 3D
-fn fbm_3d(p: vec3f, octaves: i32) -> f32 {
-  var value = 0.0;
-  var amplitude = 0.5;
-  var frequency = 1.0;
-  var pos = p;
-  for (var i = 0; i < octaves; i++) {
-    value += amplitude * noise_3d(pos * frequency);
-    frequency *= 2.0;
-    amplitude *= 0.5;
-  }
-  return value;
-}