refactor(effects): co-locate effect WGSL shaders with their .h/.cc in src/effects/

Move 13 effect-specific shaders from workspaces/main/shaders/ to src/effects/
so each effect's .h, .cc, and .wgsl are together. Update assets.txt paths in
both main and test workspaces. Update EFFECT_WORKFLOW.md to reflect new location.
Shared/reusable snippets remain in src/shaders/.

handoff(Gemini): shaders moved; src/effects/ now has .h, .cc, and .wgsl per effect.

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

1 files changed, 24 insertions, 0 deletions

diff --git a/src/effects/chroma_aberration.wgsl b/src/effects/chroma_aberration.wgsl
new file mode 100644
index 0000000..02bdb1b
--- /dev/null
+++ b/src/effects/chroma_aberration.wgsl
@@ -0,0 +1,24 @@
+@group(0) @binding(0) var smplr: sampler;
+@group(0) @binding(1) var txt: texture_2d<f32>;
+
+#include "common_uniforms"
+struct ChromaAberrationParams {
+    offset_scale: f32,
+    angle: f32,
+};
+
+@group(0) @binding(2) var<uniform> uniforms: CommonUniforms;
+@group(0) @binding(3) var<uniform> params: ChromaAberrationParams;
+
+#include "render/fullscreen_vs"
+
+@fragment fn fs_main(@builtin(position) p: vec4f) -> @location(0) vec4f {
+    let uv = p.xy / uniforms.resolution;
+
+    let amp = params.offset_scale * uniforms.audio_intensity;
+    let offset = amp * vec2f(cos(params.angle), sin(params.angle));
+    let center = textureSample(txt, smplr, uv);
+    let r = textureSample(txt, smplr, uv + offset).r;
+    let b = textureSample(txt, smplr, uv - offset).b;
+    return vec4f(r, center.g, b, 1.0);
+}