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/fish_user_key_bindings.fish

@@ -10,29 +10,33 @@ function fish_user_key_bindings
         # Keys owned by kitty.conf never reach fish and are NOT bound here:
         #   ctrl-g → lazygit overlay, ctrl-y → yazi vsplit,
         #   ctrl-h/j/k/l → vim-aware split nav (pass_keys.py).
-        # ctrl-e: tv git-files (bat preview, enter opens nvim). ctrl-o and
-        # ctrl-p also open tv cables — same keys in zsh and bash. tv runs
+        # ctrl-e: tv git-files (bat preview, enter opens nvim). ctrl-o, ctrl-p
+        # and down also open tv cables — same keys in zsh and bash. tv runs
         # --inline below the prompt; _tv_inline/_gho_bind/_pj_bind put the
         # prompt back in place (or below any output) afterwards. ctrl-a:
         # omp-session resumes or starts omp for the repo (same in zsh); when it
         # opens the omp-sessions cable and it is cancelled, it steps back up.
-        # Every binding that runs a program tells iris via _iris_busy
-        # (_bind_run, _tv_inline, _gho_bind, _pj_bind), or iris would keep
-        # its prompt key handling while tv/yazi/lazygit own the screen.
         bind -M $mode ctrl-e '_tv_inline git-files; commandline -f repaint'
-        bind -M $mode ctrl-b '_bind_run purple'
-        bind -M $mode ctrl-y '_bind_run clip-last'
+        bind -M $mode ctrl-b purple repaint
+        bind -M $mode ctrl-y clip-last
 
         bind -M $mode ctrl-o _gho_bind
         bind -M $mode ctrl-p _pj_bind
-        bind -M $mode ctrl-a '_bind_run omp-session'
+        bind -M $mode ctrl-a 'omp-session; commandline -f repaint'
+        bind -M $mode ctrl-w 'atuin ai inline; commandline -f repaint'
         # ctrl-z at the prompt: fg the only background job, or pick one from
         # the jobs tv cable when there are several (_jobs_bind).
         bind -M $mode ctrl-z _jobs_bind
 
+        # Arrow keys: atuin owns up (bound from config.fish, survives the
+        # fish_vi_key_bindings reset above because that only erases presets),
+        # down opens the pj tv cable — but only on an idle, empty prompt; see
+        # _pj_bind_down.
+        bind -M $mode down _pj_bind_down
+
         # ctrl-f: yazi (cd's to yazi's exit dir on quit).
-        bind -M $mode ctrl-f '_bind_run yy'
-        bind -M $mode ctrl-g '_bind_run lazygit'
+        bind -M $mode ctrl-f 'yy; commandline -f repaint'
+        bind -M $mode ctrl-g 'lazygit; commandline -f repaint'
 
         # ctrl-c routes through the clear wrapper (kitty scrollback + prompt
         # pinned to the bottom) AND wipes any text typed on the command line.