refactor: complete removal of 'Effect' suffix from C++ class names

Update effect class definitions in headers and implementations to match
timeline.seq naming convention. All tests passing (34/34).

Classes renamed:
- PassthroughEffect → Passthrough
- GaussianBlurEffect → GaussianBlur
- PlaceholderEffect → Placeholder
- HeptagonEffect → Heptagon
- ParticlesEffect → Particles
- RotatingCubeEffect → RotatingCube
- Hybrid3DEffect → Hybrid3D
- FlashEffect → Flash
- PeakMeterEffect → PeakMeter

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/effects/particles_effect.cc b/src/effects/particles_effect.cc
index b9e2b9c..f93133f 100644
--- a/src/effects/particles_effect.cc
+++ b/src/effects/particles_effect.cc
@@ -1,5 +1,5 @@
 // This file is part of the 64k demo project.
-// It implements the ParticlesEffect.
+// It implements the Particles.
 
 #include "util/fatal_error.h"
 #include "effects/particles_effect.h"
@@ -7,7 +7,7 @@
 #include "gpu/shaders.h"
 #include <vector>
 
-ParticlesEffect::ParticlesEffect(const GpuContext& ctx,
+Particles::Particles(const GpuContext& ctx,
                                      const std::vector<std::string>& inputs,
                                      const std::vector<std::string>& outputs)
     : Effect(ctx, inputs, outputs) {
@@ -63,7 +63,7 @@ ParticlesEffect::ParticlesEffect(const GpuContext& ctx,
   render_pass_.instance_count = NUM_PARTICLES;
 }
 
-void ParticlesEffect::render(WGPUCommandEncoder encoder,
+void Particles::render(WGPUCommandEncoder encoder,
                                const UniformsSequenceParams& params,
                                NodeRegistry& nodes) {
   // Update uniforms