Add KKTerm as a terminal tool for Windows/WSL workflows

[ryantsai]

KKTerm is a Windows-first, local-first terminal for managing connections, sessions, and workspaces.

Repo: https://github.com/ryantsai/KKTerm
Landing page: https://ryantsai.github.io/KKTerm/

It seems relevant for the guide's Windows Terminal / WSL / developer-tools audience. If you'd like, I can send a small PR with the exact text.