Estimating Penalized AFT Models via Coordinate Descent // Provides penalized accelerated failure time (AFT) model estimation for right-censored and partly interval-censored survival data using induced smoothing and coordinate descent algorithms. Supported penalties include broken adaptive ridge (BAR), LASSO, adaptive LASSO, and SCAD. Core estimation routines are implemented in 'C++' via 'Rcpp' and 'RcppArmadillo' for computational efficiency. The methodology is related to Zeng and Lin (2008) doi:10.1093/biostatistics/kxm034, Xu et al. (2010) doi:10.1002/sim.2576, Dai et al. (2018) doi:10.1016/j.jmva.2018.08.007, and Choi et al. (2025) doi:10.48550/arXiv.2503.11268.