Revert "Add rtk integration: brew package and pi bash rewrite extension"

This reverts commit 8dd0727.

Author: juanibiapina

dotfiles/pi/.pi/agent/extensions/rtk.ts

@@ -199,7 +199,6 @@ let cfg = config.modules.system; in
         "stow" # dotfiles manager
         "superfile" # file manager
         "oiwn/tap/tarts" # terminal arts and animations
-        "rtk" # developer toolkit
         "yt-dlp" # video/audio downloader
         "terminal-notifier" # macOS terminal notifier
         "tree" # directory tree viewer