Document the bundled OpenRouter configuration

examples/go-library/observe/main.go

@@ -98,7 +98,7 @@ func run() (summary, error) {
 	engine, err := promptkit.NewEngine(promptkit.Config{
 		Sources:    promptkit.ConfigurationSources{Underlays: []configkit.Underlay{{Inputs: inputs}}},
 		HTTPClient: &http.Client{Transport: transport},
-	}, promptkit.WithSchemaFS(assets, "schemas"))
+	}, promptkit.WithBundledOpenRouter(false), promptkit.WithSchemaFS(assets, "schemas")) // Keep the example's configuration self-contained.
 	if err != nil {
 		return summary{}, err
 	}

examples/go-library/prepare/main.go

@@ -63,7 +63,7 @@ func run(ctx context.Context, exampleDir string, out io.Writer) error {
 			{Inputs: []configkit.Input{support, review}},
 			{Inputs: []configkit.Input{override}},
 		},
-	}})
+	}}, promptkit.WithBundledOpenRouter(false)) // Keep this example's inventory caller-owned.
 	if err != nil {
 		return err
 	}

examples/go-library/run/main.go

@@ -54,7 +54,7 @@ func run(ctx context.Context, exampleDir string, out io.Writer) error {
 			{ID: "offline-example", Endpoint: &endpoint, Model: &model},
 		})}}}},
 		Main: &configkit.Input{Source: configkit.File(filepath.Join(exampleDir, "prompt.yaml"))},
-	}}, promptkit.WithLLMClient(deterministicClient{}))
+	}}, promptkit.WithBundledOpenRouter(false), promptkit.WithLLMClient(deterministicClient{})) // Use only this example's offline configuration.
 	if err != nil {
 		return err
 	}