feat(particles): Implement transparent circular particles with alpha 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

1 files changed, 117 insertions, 73 deletions

diff --git a/src/generated/assets_data.cc b/src/generated/assets_data.cc
index 3498e18..1ad54a9 100644
--- a/src/generated/assets_data.cc
+++ b/src/generated/assets_data.cc
@@ -370328,7 +370328,7 @@ alignas(16) static const uint8_t ASSET_DATA_SHADER_PARTICLE_COMPUTE[] = {
     0x20, 0x20, 0x20, 0x70, 0x61, 0x72, 0x74, 0x69, 0x63, 0x6c, 0x65, 0x73, 
     0x5b, 0x69, 0x5d, 0x20, 0x3d, 0x20, 0x70, 0x3b, 0x0a, 0x7d, 0x0a, 0x00
 };
-const size_t ASSET_SIZE_SHADER_PARTICLE_RENDER = 1296;
+const size_t ASSET_SIZE_SHADER_PARTICLE_RENDER = 1825;
 alignas(16) static const uint8_t ASSET_DATA_SHADER_PARTICLE_RENDER[] = {
     0x73, 0x74, 0x72, 0x75, 0x63, 0x74, 0x20, 0x50, 0x61, 0x72, 0x74, 0x69, 
     0x63, 0x6c, 0x65, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x70, 0x6f, 
@@ -370364,81 +370364,125 @@ alignas(16) static const uint8_t ASSET_DATA_SHADER_PARTICLE_RENDER[] = {
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 };
 const size_t ASSET_SIZE_SHADER_PASSTHROUGH = 665;
 alignas(16) static const uint8_t ASSET_DATA_SHADER_PASSTHROUGH[] = {