Test: Guard settings docs contract cleanup

config/dot/quickshell/scripts/panama-settings-docs

@@ -14,7 +14,11 @@ takes to run the suite.
 
 Usage:
   panama-settings-docs            write docs/settings.md
+  panama-settings-docs --output PATH
+                                  write PATH instead
   panama-settings-docs --check    exit 1 if the committed copy is stale
+  panama-settings-docs --check --output PATH
+                                  exit 1 if PATH is stale
   panama-settings-docs --stdout   print without writing
 
 Where each group of settings lives comes from SettingsSearch.qml's routing and