revert(shell): move iris integration to the iris branch

Reverts 43dfe48, 0692ae3, e0cdcd6 and the cable-description half of
098da70 (the star-prompt stats stay). master returns to the pre-iris
shell setup: atuin in fish/zsh/bash, the down -> pj binding with
PJ_QUIET, and the fish/zsh key bindings as they were. The iris work
lives on the `iris` branch.

dot_config/fish/functions/_tv_inline.fish

@@ -3,10 +3,8 @@ function _tv_inline --description 'tv --inline below the prompt, cursor back on
     # its own first row when it exits; step back up so the following
     # `commandline -f repaint` redraws the prompt in place instead of one line
     # lower. /dev/tty keeps the move out of callers that capture stdout (gho).
-    _iris_busy start
     tv $argv --inline
     set -l st $status
-    _iris_busy stop
     printf '\033[A' >/dev/tty
     return $st
 end