BrewKit

Extend BrewKit's BrewSession Swift API for Homebrew built-in commands with typed async APIs, structured models, bilingual doc comments, BrewSessionError error handling, focused tests, and synchronized TODO tracking in TodoLists/BrewSession-TODO.md. Use when adding or updating BrewSession command wrappers, mapping brew commands to Swift APIs, modeling brew JSON output, updating built-in command coverage, or validating BrewKit session behavior.