feat(logging): gate scrollback capture in smart_exit under C5 guard

functions/smart_exit.fish

@@ -48,6 +48,8 @@ function smart_exit --description 'Capture colorized scrollback before exiting,
         return 0
     end
 
+    # C5 — Logging & Capture: skip all capture when logging is disabled
+    if __fish_config_op_enabled __fish_config_op_logging
         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)
 
@@ -92,6 +94,7 @@ function smart_exit --description 'Capture colorized scrollback before exiting,
             echo -e "$c_warn""➔""$c_reset Exiting discreetly; $c_bold""no history logs saved.""$c_reset"
             sleep 0.4
         end
+    end
 
     # Call the true system exit directly
     builtin exit