I literally don't understand the first example. What just happened here? Did pkgx see that I failed to run bun and then just like... installed it and ran it for me? Does that mean on my next prompt I should run `bun` or should I run `pkgx` again?

  $ bun
  command not found: bun
  ^^ type `pkgx` to run that
  
  $ pkgx
  running `bun`…
  
  Bun: a fast JavaScript runtime, package manager, bundler and test runner.
  # …