Calculate Heat Stress Indices // Calculates heat-stress indices from meteorological observations, including the physically based wet-bulb globe temperature model described by Liljegren et al. (2008) doi:10.1080/15459620802310770. The package provides an independently maintained R implementation with row- level diagnostics, configurable physical controls, and batch processing for the Liljegren method; it is not a bitwise- compatible port of the original program, and cross- implementation differences are expected.