a minimal, configurable (file based for git) tiling window manager
I like i3, it ticks all your boxes. Made my own config in 2020 and it still works. Keep in mind that you have to design your whole desktop enviroment when you go the window manager route. bspwm might be an option as well
terminal based package management as easy as brew (maybe Nix?)
Every linux distro has it, I’m an Arch person, many people like Archs package manager pacman, so you could go with EndevourOS or if you’re adventorous with vsnilla Arch.
as much terminal emulator based as possible (i honestly mostly only need a browser and the terminal, most other apps have a TUI that i can use with the keyboard, see the above requirement)
Well, what kind of software you’ll run is up to you. Linux has all the TUI stuff. If you haven’t already, check out vim, emacs and nnn. Don’t forget to customize your shell (and choose it first, i would recommend zsh or fish).
**General advice:**Look into r/unixporn, most posts there have dotfiles, look for something you like an try it (with a fresh user that you can delete afterwarda maybe?)