Implement normalize output conversion

internal/normalize/normalize.go

@@ -2,7 +2,9 @@ package normalize
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
+	"os"
 
 	"gitea.maximumdirect.net/eric/seriatim/internal/config"
 )
@@ -14,10 +16,34 @@ func Run(ctx context.Context, cfg config.NormalizeConfig) error {
 		return err
 	}
 
-	if _, err := ParseFile(cfg.InputFile); err != nil {
+	parsed, err := ParseFile(cfg.InputFile)
+	if err != nil {
 		return err
 	}
 
-	// TODO: Implement transcript normalization transformation.
-	return fmt.Errorf("normalize command is not implemented yet")
+	output, err := Build(parsed, cfg)
+	if err != nil {
+		return err
+	}
+
+	if err := writeOutputJSON(cfg.OutputFile, output); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func writeOutputJSON(path string, value any) error {
+	file, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	encoder := json.NewEncoder(file)
+	encoder.SetIndent("", "  ")
+	if err := encoder.Encode(value); err != nil {
+		return fmt.Errorf("encode normalize output JSON: %w", err)
+	}
+	return nil
 }