Store one prompt definition per ID

assembled_workflow_benchmark_test.go

@@ -100,11 +100,12 @@ func newAssembledWorkflowFixture(b *testing.B, name string) assembledWorkflowFix
 
 	config := map[string]any{
 		"profiles": map[string]any{"profile": profile},
-		"prompts": map[string]any{"workflow": map[string]any{"v1": map[string]any{
+		"prompts": map[string]any{"workflow": map[string]any{
+			"version":         "v1",
 			"default_profile": "profile",
 			"messages":        []any{map[string]any{"role": "user", "content": message}},
 			"output":          output,
-		}}},
+		}},
 	}
 	engine, err := promptkit.NewEngine(promptkit.Config{Sources: promptkit.ConfigurationSources{Main: &configkit.Input{
 		Source: configkit.Mapping("assembled workflow benchmark", config),