feat: new engine format

cmd/lambda/lambda_reduce.go

@@ -77,8 +77,7 @@ func LambdaReduce() *cobra.Command {
 			}
 
 			// Create process.
-			process := engine.Load()
-			err = process.Set(compiled)
+			process, err := engine.Load(compiled)
 			if err != nil {
 				return err
 			}

cmd/lambda/registry.go

@@ -15,7 +15,7 @@ func GetRegistry() *registry.Registry {
 	(registry.RegisterCodec(r, convert.Saccharine2Lambda{}, "saccharine", "lambda"))
 
 	// Engines
-	(registry.RegisterEngine(r, normalorder.Engine{}, "normalorder", "lambda"))
+	(registry.RegisterEngine(r, normalorder.NewProcess, "normalorder", "lambda"))
 
 	// Marshalers
 	(registry.RegisterMarshaler(r, lambda.Marshaler{}, "lambda"))