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