Chapter 11 - Hash Tables

This legacy guide forwards to the native fourth-edition Chapter 11 guide CLRSLean.FourthEdition.Chapter_11. The third-edition-numbered section imports CLRSLean.Chapter_11.Section_11_* (including the promoted §11.5 perfect-hashing section) also forward to the native fourth-edition sources during the compatibility period (see docs/migrations/clrs4.md).