29.3 ComplementarySlackness (legacy compatibility path)
Third-edition-numbered compatibility path for this module (fourth-edition
Section 29.3, duality). The canonical fourth-edition source is
CLRSLean.FourthEdition.Chapter_29.Section_29_3_Duality.ComplementarySlackness;
this module forwards to it so legacy imports keep working during the
compatibility period (see docs/migrations/clrs4.md).