Card update: rank-4 re-export GPU results (full mobile delegation; measured on-device)

Card: add the measured Pixel 8a rows (GPU vs CPU) that the Android sweep produced

Card: measured Performance table (M4 Max + iPhone 17 Pro), verified runnable usage script, accuracy note

LFM2.5-Encoder-350M-PII-Detector LiteRT: int8 (iPhone-verified bit-exact) + fp16, task-level parity verified