Solve Sudoku in tmux

Tested with tmux 3.4 and Ruby 3.2.3 on Ubuntu 24.04.

Try it by replacing some numbers in sudoku-solved with spaces, then running:

$ ./tmux.rb sudoku-solved

Press q or control-C to stop the program and exit tmux.

Learn more about how this works on my blog or in this video.

I also made a compiler for tmux.