chore: MLP pipeline, evaluation updates, feature importance, confusion matrices

chore: integration cleanup — remove eye CNN, add threshold justification, fix pipeline

Put all the models together (expect UI)

integrated open/closed eye cnn in script

reorg folders, add MLP demo

feat: add optional eye model (YOLO/MobileNet) alongside geometry

feat: stage 2 head pose, eye behaviour, MAR/yawn, tighter focus; add torch deps

chore: add template layout and stage 1 face mesh demo