Imports

Section 29.4 - Duality (legacy compatibility path)

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