Refactor documentation and code comments for clarity and consistency

fix(numeric): BMI-band fallback for out-of-distribution profiles

fix(numeric): map predict_proba through label_encoder to restore severity-ordered probabilities

numeric: fix LogisticRegression API for sklearn 1.8; retrain artifacts

numeric: dual-task training script and inference wrapper

numeric: add UCI Obesity loader and Mifflin-St Jeor helpers

init: project scaffold and gitignore