refactor(config): migrate C4 integrations call sites to self-identifying guard

functions/tab.fish

@@ -4,6 +4,9 @@
 # CATEGORY
 #   08-terminal-management
 #
+# COMPONENT
+#   integrations/window-mgmt
+#
 # SYNOPSIS
 #   tab [args...]
 #
@@ -23,7 +26,7 @@
 #   tab
 function tab --description 'Spawn a new tab in the current terminal'
     # Opinionated guard (C4): integrations disabled
-    if not __fish_config_op_enabled __fish_config_op_integrations
+    if not __fish_config_op_enabled (status current-function)
         set -l c_err (set_color red)
         set -l c_reset (set_color normal)
         echo "$c_err"'tab: disabled by __fish_config_op_integrations'"$c_reset" >&2