Preserve references for full-transfer object parameters

regression/tier5/GtkSmoke.swift

@@ -52,4 +52,23 @@ struct GtkSmokeTests {
         #expect(adjustment.value == 7)
         #expect(adjustment.getValue() == 7)
     }
+
+    @Test("A transfer-full object parameter keeps the Swift wrapper's reference balanced")
+    func transferFullParameterDoesNotOverRelease() throws {
+        // `gtk_shortcut_set_action` is annotated `(transfer full)`: it consumes
+        // one reference. The generated binding must add one before the call, or
+        // the `NamedAction` wrapper's `deinit` releases a reference it no longer
+        // owns, GTK finalizes the action while the shortcut still points at it,
+        // and reading it back trips `g_object_unref: assertion 'G_IS_OBJECT
+        // (object)' failed` plus a use-after-free.
+        let shortcut = Shortcut(trigger: nil, action: nil)
+        do {
+            let action = NamedAction(name: "app.quit")
+            shortcut.setAction(action: action)
+        }
+        // The wrapper is gone; the action must still be alive inside `shortcut`.
+        let stored = shortcut.getAction()
+        #expect(stored != nil)
+        #expect(stored?.toString().contains("app.quit") == true)
+    }
 }