kfre 0.0.2

kfre 0.0.1

Initial CRAN submission.

Added

• Core risk API: risk_pred_core() (2- and 5-year KFRE).
• R6 helper: RiskPredictor with predict_kfre() and kfre_person().
• Dataframe helper: add_kfre_risk_col() to append kfre_<n>var_<y>year columns.
• Performance utilities: eval_kfre_metrics() and plot_kfre_metrics().
• Outcome & staging: class_esrd_outcome() and class_ckd_stages().
• Misc: apply_precision(), unit tests incl. Seoul demo (skipped if local data missing).