Section 8.2 - Mutable output-array refinement (legacy compatibility path)
Third-edition-numbered compatibility path for the counting-sort mutable
output-array refinement. The canonical fourth-edition source is
CLRSLean.FourthEdition.Chapter_08.Section_08_2_Counting_Sort.MutableOutputArray;
this module forwards to it so legacy imports keep working during the
compatibility period (see docs/migrations/clrs4.md).