Section 28.3 - Symmetric positive-definite matrices and least-squares approximation (legacy compatibility path)
Third-edition-numbered compatibility path for symmetric positive-definite matrices and least-squares approximation. The canonical
fourth-edition source is
CLRSLean.FourthEdition.Chapter_28.Section_28_3_Symmetric_Positive_Definite;
this module forwards to it so legacy imports keep working during the
compatibility period (see docs/migrations/clrs4.md).