Curses-exec: interactive xargs for less

Feels similar in shape to fzf (and similar tools) except normal mode vim keys in the middle of the pipe rather than fuzzy search and ctrl-* for advanced actions

I always wanted to pipe `ps -a` to something interactive using vim key bindings to select the process to kill. Maybe now someone in the comments will tell me how to do it with xargs and a complicated vim script instead of vibe coding my own.