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/config.fish

@@ -33,6 +33,11 @@ fish_add_path $HOME/.grok/bin
 # Generated for envman. Do not edit.
 test -s ~/.config/envman/load.fish; and source ~/.config/envman/load.fish
 
+if status is-interactive
+    atuin init fish | source
+    atuin ai init fish | source
+end
+
 # cmux
 fish_add_path "/home/prad/.cmux/bin"
 fish_add_path "/home/prad/.cache/.bun/bin"
@@ -41,20 +46,53 @@ for _f in $HOME/.config/herdr/plugins/github/herdr-automatic-rename-*/shell/hook
     test -r "$_f"; and source "$_f"; and break
 end
 
-eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv fish)"
 
-# iris (~/.config/iris/config.toml). The init's first half `exec`s iris from an
-# interactive fish, which then starts this config again inside its pty; the
-# second half installs the cwd/command hooks there. Skipped where iris is not
-# installed. `IRIS_RESCUE=1 fish` opens a plain fish (e.g. if iris breaks).
-if command -q iris
-    # fish's `query-term` feature asks the terminal for its capabilities and,
-    # in kitty, turns on the kitty keyboard protocol (keys as CSI-u escapes).
-    # iris reads raw key bytes and cannot parse those, so its menu never
-    # opened in kitty. Feature flags are read at startup, so export the opt-out
-    # before `exec iris`: the fish iris starts inherits it.
-    if status is-interactive; and not set -q IRIS_PID; and not set -q IRIS_RESCUE
-        set -gx fish_features no-query-term
+# Question mark at start of line - natural language mode
+function _atuin_ai_question_mark
+    set -l buf (commandline -b)
+
+    # If buffer is empty or just contains '?', trigger natural language mode
+    if test -z "$buf" -o "$buf" = "?"
+        commandline -r ""
+
+        # Close the semantic prompt zone (OSC 133 C) so terminals with
+        # shell integration don't erase the TUI's output during their
+        # resize-time prompt reflow.
+        printf '\033]133;C\007' > /dev/tty
+
+        # Run atuin ai inline, swapping stdout and stderr
+        set -l output (atuin ai inline --hook 3>&1 1>&2 2>&3 | string collect)
+
+        if string match --quiet '__atuin_ai_print__:*' "$output"
+            echo (string replace "__atuin_ai_print__:" "" -- "$output" | string collect)
+            commandline -f repaint
+        else if test "$output" = "__atuin_ai_cancel__"
+            commandline -f repaint
+        else if string match --quiet '__atuin_ai_execute__:*' "$output"
+            # Execute the command immediately
+            set -l cmd (string replace "__atuin_ai_execute__:" "" -- "$output" | string collect)
+            commandline -r "$cmd"
+            commandline -f repaint
+            commandline -f execute
+        else if string match --quiet '__atuin_ai_insert__:*' "$output"
+            # Insert the command for editing
+            set -l cmd (string replace "__atuin_ai_insert__:" "" -- "$output" | string collect)
+            commandline -r "$cmd"
+            commandline -f repaint
+        else if test -n "$output"
+            # Default: insert for editing
+            commandline -r "$output"
+            commandline -f repaint
+        else
+            commandline -f repaint
+        end
+    else if not contains -- "$fish_key_bindings" fish_vi_key_bindings fish_hybrid_key_bindings
+        # Not at empty prompt, just insert the question mark
+        commandline -i "?"
     end
-    iris init fish | source
 end
+
+# Set up keybindings
+bind "?" _atuin_ai_question_mark
+
+eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv fish)"