Imports

Section 23.1 - Growing a minimum spanning tree (legacy compatibility path)

Third-edition-numbered compatibility path for the minimum-spanning-tree growth model. The canonical fourth-edition source is CLRSLean.FourthEdition.Chapter_21.Section_21_1_Growing_Minimum_Spanning_Trees; this module forwards to it so legacy imports keep working during the compatibility period (see docs/migrations/clrs4.md).