uddbart 0.2.0

• Added fit_uddbart_vi() for a lightweight Gaussian variational approximation to the unified discrete-time hazard model.
• Added engine = "vi" to uddbart() for a BART-free UDDBART-VI workflow.
• Made the BART package optional. fit_bart_hazard() now falls back to stats::glm(family = binomial) when BART is unavailable.
• Updated dynamic prediction internals to work with BART, glm fallback, and VI hazard backends.
• Added BART-free tests for the glm fallback and UDDBART-VI workflow.

uddbart 0.1.0

• First release of the U-DDBART-IC framework (version 0.1, engineered latent-state features).
• Pipeline: simulate_uddbart_data(), prepare_uddbart_data(), make_followup_grid(), construct_latent_state(), fit_bart_hazard() (logit-link BART), compute_survival_from_hazard(), interval_survival_likelihood(), uddbart(), and predict.uddbart() for the dynamic target pi(t, tau) = 1 - S(t+tau)/S(t).
• Predictive-performance evaluation with IPCW: brier_score() (time-dependent and integrated Brier score), auc_td() (cumulative/dynamic time-dependent AUC) and calibration_table().
• print, summary and plot methods.
• Bundled anonymised CML molecular-monitoring cohort (cml_long, cml_event).
• Functions that take a seed restore the caller’s RNG state on exit.
• An R Journal manuscript and reproducible replication script are provided in paper/ (excluded from the package build).