Presence Guard v1.2.0
Replaces full-body detection with lightweight OpenCV YuNet face detection. Any detected face above the confidence threshold counts as present, regardless of head orientation. Bags, legs, and body-shaped objects no longer prevent sleep. Includes a live camera_preview.py diagnostic tool. SHA-256: FADC2020D5FC3967D5F383CDF76A110CF6DF608CEB49E030EA516CFD266663AD