Imports

Section 21.4 - Inverse-Ackermann amortization (legacy compatibility path)

Third-edition-numbered compatibility path for the inverse-Ackermann amortization. The canonical fourth-edition source is CLRSLean.FourthEdition.Chapter_19.Section_19_4_Analysis.InverseAckermann; this module forwards to it so legacy imports keep working during the compatibility period (see docs/migrations/clrs4.md).