feat(shell): add scrollback history capture on shell exit

- Add smart_exit function: captures Kitty scrollback to a timestamped
  log file on exit; --no-log/-n skips capture; auto-prunes oldest logs
  once count exceeds SCROLLBACK_HISTORY_MAX_FILES
- Wire exit → smart_exit in config.fish for interactive sessions;
  export SCROLLBACK_HISTORY_DIR and SCROLLBACK_HISTORY_MAX_FILES with
  sane defaults (~/.terminal_history and 100 respectively)
- Update cat to detect files in SCROLLBACK_HISTORY_DIR or containing
  raw ANSI escape sequences and pass them through command cat instead
  of bat, preserving color output
- Remove redundant alias rm="rm -i" from tricks.fish (superseded by
  functions/rm.fish trash-aware wrapper)
- Sync README: new Scrollback History integration section, smart_exit
  added to System functions table, cat description updated, stale rm
  Safety Wrapper entry and note removed

functions/smart_exit.fish

@@ -0,0 +1,68 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# Function to capture colorized scrollback before exiting, with pruning and safe overrides
+function smart_exit --description 'Capture colorized scrollback before exiting, with pruning and safe overrides'
+    set -l options h/help n/no-log
+    argparse $options -- $argv
+    or return 1
+
+    set -l c_primary (set_color cyan)
+    set -l c_accent (set_color green)
+    set -l c_warn (set_color yellow)
+    set -l c_bold (set_color --bold)
+    set -l c_reset (set_color normal)
+
+    if set -q _flag_help
+        echo -e "Usage: $c_accent"exit"$c_reset [$c_primary""OPTIONS""$c_reset]"
+        echo ""
+        echo "Closes the current shell session, automatically archiving the window scrollback."
+        echo ""
+        echo "Options:"
+        echo -e "  $c_primary""-h, --help""$c_reset    Show this help message"
+        echo -e "  $c_primary""-n, --no-log""$c_reset  Exit immediately $c_bold""without""$c_reset saving a scrollback history log"
+        return 0
+    end
+
+    set -l snapshot_dir (set -q SCROLLBACK_HISTORY_DIR; and echo $SCROLLBACK_HISTORY_DIR; or echo "$HOME/.terminal_history")
+    set -l max_files (set -q SCROLLBACK_HISTORY_MAX_FILES; and echo $SCROLLBACK_HISTORY_MAX_FILES; or echo 100)
+
+    # Handle Scrollback Capture (Skipped if -n/--no-log is used)
+    if not set -q _flag_no_log
+        mkdir -p $snapshot_dir
+        set -l timestamp (date "+%Y-%m-%d_%H-%M-%S")
+        set -l filename "$snapshot_dir/scrollback_$timestamp.log"
+
+        # Safe child process detection
+        set -l active_tui (ps -o comm= --ppid $fish_pid 2>/dev/null)
+
+        if test -n "$KITTY_WINDOW_ID"
+            # LIVE BUFFER CHECK: Check the active token variable $_ 
+            # If the user typed exit, $_ will match "exit". If flags were passed, 
+            # we check if it contains the phrase "exit" to match 'exit -n' or 'exit --help'.
+            if string match -qr exit "$_"
+                if not string match -qr '^(nvim|vim|vi|nano|emacs|tmux)$' "$active_tui"
+                    kitty @ get-text --match id:$KITTY_WINDOW_ID --extent all --ansi | sed 's/^\[38;2;[0-9;]*m//g' >$filename 2>/dev/null
+                end
+            end
+        end
+
+        # 4. Automatic Pruning Logic
+        set -l current_logs $snapshot_dir/scrollback_*.log
+        if test -f "$current_logs[1]"
+            set -l total_files (count $current_logs)
+            if test $total_files -gt $max_files
+                set -l num_to_delete (math $total_files - $max_files)
+                for i in (seq 1 $num_to_delete)
+                    rm -f $current_logs[$i]
+                end
+            end
+        end
+    else
+        echo -e "$c_warn""➔""$c_reset Exiting discreetly; $c_bold""no history logs saved.""$c_reset"
+        sleep 0.4
+    end
+
+    # Call the true system exit directly
+    builtin exit
+end