Enable bundled OpenRouter configuration by default

sources_contract_test.go

@@ -23,7 +23,7 @@ func TestProgrammaticSourcesPreserveOrderAndRejectDuplicates(t *testing.T) {
 	params["visible"] = "changed"
 	engine, err := promptkit.NewEngine(promptkit.Config{Sources: promptkit.ConfigurationSources{
 		Underlays: []configkit.Underlay{{Inputs: []configkit.Input{{Source: backendSource}, {Source: profileSource}}}},
-	}})
+	}}, promptkit.WithBundledOpenRouter(false))
 	if err != nil {
 		t.Fatal(err)
 	}