- Add activation clamping [-10, 10] in TCN forward pass to prevent NaN
from real CSI amplitude ranges after normalization
- Add safe sigmoid with input clamping [-20, 20]
- Add scripts/record-csi-udp.py: lightweight ESP32 CSI UDP recorder
Validated on real paired data (345 samples):
ESP32 CSI: 7,000 frames at 23fps from COM8
Mac camera: 6,470 frames at 22fps via MediaPipe
PCK@20: 92.8% | Eval loss: 0.083 | Bone loss: 0.008
Co-Authored-By: claude-flow <ruv@ruv.net>