Estimates and compares areas under curves formed by repeatedly
measured outcomes observed subject to censoring and a terminal event.
Implements Kaplan-Meier adjustment for censoring, influence-function
standard errors, Wald inference, and multiplier perturbation inference,
with utilities for interpolation, simulation, tabulation, and plotting.
For additional details, see: McCaw ZR, Armbruster S, Tian L, Claggett BL,
Fitzmaurice G, Foà A, Pfeffer MA, Wei LJ (2026)