This test simulates the COMPLETE particle rendering pipeline.
2x2 Spritesheet (128x128 pixels):
┌───────────┬───────────┐
│ RED (0) │ GREEN (1) │ row=0, v: 0.0 - 0.5
├───────────┼───────────┤
│ BLUE (2) │ YELLOW(3) │ row=1, v: 0.5 - 1.0
└───────────┴───────────┘
| Frame | Expected | Got | Status |
|---|