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, 32 deletions

diff --git a/common/shaders/gaussian_blur.wgsl b/common/shaders/gaussian_blur.wgsl
deleted file mode 100644
index 7f85719..0000000
--- a/common/shaders/gaussian_blur.wgsl
+++ /dev/null
@@ -1,32 +0,0 @@
-// Gaussian blur shader for Sequence v2
-#include "sequence_uniforms"
-#include "render/fullscreen_uv_vs"  // <- VertexOutput + vs_main
-
-@group(0) @binding(0) var input_sampler: sampler;
-@group(0) @binding(1) var input_texture: texture_2d<f32>;
-@group(0) @binding(2) var<uniform> uniforms: UniformsSequenceParams;
-
-struct GaussianBlurParams {
-    direction: vec2f,
-    radius: f32,
-    _pad: f32,
-};
-@group(0) @binding(3) var<uniform> params: GaussianBlurParams;
-
-@fragment fn fs_main(in: VertexOutput) -> @location(0) vec4f {
-    let texel_size = 1.0 / uniforms.resolution;
-    let offset = params.direction * texel_size;
-
-    var color = vec4f(0.0);
-    let kernel_size = i32(params.radius);
-    var weight_sum = 0.0;
-
-    for (var i = -kernel_size; i <= kernel_size; i++) {
-        let sample_offset = f32(i) * offset;
-        let weight = exp(-f32(i * i) / (2.0 * params.radius * params.radius));
-        color += textureSample(input_texture, input_sampler, in.uv + sample_offset) * weight;
-        weight_sum += weight;
-    }
-
-    return color / weight_sum;
-}