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blending (Task #53)
## Visual Improvements
- Particles now render as smooth fading circles instead of squares
- Added UV coordinates to vertex shader output
- Fragment shader applies circular falloff (smoothstep 1.0 to 0.5)
- Lifetime-based fade: alpha multiplied by particle.pos.w (1.0 → 0.0)
## Pipeline Changes
- Enabled alpha blending for particle shaders (auto-detected via strstr)
- Blend mode: SrcAlpha + OneMinusSrcAlpha (standard alpha blending)
- Alpha channel: One + OneMinusSrcAlpha for proper compositing
## Demo Integration
- Added 5 ParticleSprayEffect instances at key moments (6b, 12b, 17b, 24b, 56b)
- Increased particle presence throughout demo
- Particles now more visually impactful with transparency
## Files Modified
- assets/final/shaders/particle_render.wgsl: Circular fade logic
- src/gpu/gpu.cc: Auto-enable blending for particle shaders
- assets/demo.seq: Added ParticleSprayEffect at multiple sequences
## Testing
- All 23 tests pass (100%)
- Verified with demo64k visual inspection
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