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, 0 insertions, 27 deletions

diff --git a/workspaces/main/shaders/flash.wgsl b/workspaces/main/shaders/flash.wgsl
deleted file mode 100644
index 379086e..0000000
--- a/workspaces/main/shaders/flash.wgsl
+++ /dev/null
@@ -1,27 +0,0 @@
-// Flash shader for visual sync testing
-// Pulses white on beat
-#include "sequence_uniforms"
-
-@group(0) @binding(2) var<uniform> uniforms: UniformsSequenceParams;
-
-struct VertexOutput {
-    @builtin(position) position: vec4f,
-    @location(0) uv: vec2f,
-};
-
-@vertex fn vs_main(@builtin(vertex_index) vid: u32) -> VertexOutput {
-    var out: VertexOutput;
-    let x = f32((vid & 1u) << 1u);
-    let y = f32((vid & 2u));
-    out.position = vec4f(x * 2.0 - 1.0, 1.0 - y * 2.0, 0.0, 1.0);
-    out.uv = vec2f(x, y);
-    return out;
-}
-
-@fragment fn fs_main(in: VertexOutput) -> @location(0) vec4f {
-  // Strong flash on beat, fades quickly
-  let intensity = pow(1.0 - uniforms.beat_phase, 4.0);
-  // Add audio intensity for extra punch
-  let final_intensity = intensity * (1.0 + uniforms.audio_intensity * 0.5);
-  return vec4f(final_intensity, final_intensity, final_intensity, 1.0);
-}