Imports

Section 28.1 - Solving systems of linear equations (legacy compatibility path)

Third-edition-numbered compatibility path for the LUP decomposition and LUP-SOLVE. The canonical fourth-edition source is CLRSLean.FourthEdition.Chapter_28.Section_28_1_Linear_Equations; this module forwards to it so legacy imports keep working during the compatibility period (see docs/migrations/clrs4.md).