Implemented the initial Go framework

internal/config/config_test.go

@@ -0,0 +1,35 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestOmittingNormalizeSpeakersDoesNotRequireSpeakers(t *testing.T) {
+	dir := t.TempDir()
+	input := writeTempFile(t, dir, "input.json")
+	output := filepath.Join(dir, "merged.json")
+
+	_, err := NewMergeConfig(MergeOptions{
+		InputFiles:            []string{input},
+		OutputFile:            output,
+		InputReader:           DefaultInputReader,
+		OutputModules:         DefaultOutputModules,
+		PreprocessingModules:  "validate-raw",
+		PostprocessingModules: DefaultPostprocessingModules,
+	})
+	if err != nil {
+		t.Fatalf("expected speakers file to be optional when normalize-speakers is omitted, got %v", err)
+	}
+}
+
+func writeTempFile(t *testing.T, dir string, name string) string {
+	t.Helper()
+
+	path := filepath.Join(dir, name)
+	if err := os.WriteFile(path, []byte("{}\n"), 0o600); err != nil {
+		t.Fatalf("write temp file: %v", err)
+	}
+	return path
+}