Phase 3: Camera / presence detection (OpenCV + MediaPipe)

[CodeCreatorManMike]

Behaviour-aware presence system using a camera module.

• Presence detection: user at desk, away, or asleep
• Behaviour identification: scrolling phone, reading, working, lying down
• Study enforcement: if phone picked up mid-study block, nudge fires immediately
• Processing on-device or backend (user controlled)
• Trained on common user behaviours - not surveillance, a context layer

Camera hardware not in V1 BOM. Phase 3 only.