Section 28.2 - Inverting matrices (legacy compatibility path)
Third-edition-numbered compatibility path for matrix inversion via LUP. The canonical
fourth-edition source is
CLRSLean.FourthEdition.Chapter_28.Section_28_2_Inverting_Matrices;
this module forwards to it so legacy imports keep working during the
compatibility period (see docs/migrations/clrs4.md).