harleypig/dotfiles ? reverse-engineered prompt

Build me a personal dotfiles setup for my Linux and Windows machines, with one main shell startup file that ties everything together and can be linked to my bash profile, bashrc, and profile. I want it to manage my aliases, prompt, completions, PATH, and environment variables in a clean modular way so I can turn tool specific configs on and off easily.

Please include support for common dev tools like git, vim, tmux, python, node, rust, go, terraform, and a few utility scripts in a bin folder. Also add a simple way to choose which config files get linked on each machine, plus a default list of extra bin folders to add to PATH. If it makes sense, set up the Windows PowerShell side too, so the same repo can cover both environments. Keep it organized, easy to edit, and make sure I can test it with a new login shell. Look up current docs online if you need to.