Add normalize configuration contract

internal/config/config.go

@@ -15,6 +15,7 @@ type PipelineConfig struct {
 	WhisperX     WhisperXConfig     `yaml:"whisperx"`
 	Seriatim     SeriatimConfig     `yaml:"seriatim"`
 	Audita       AuditaConfig       `yaml:"audita"`
+	Normalize    *NormalizeConfig   `yaml:"normalize"`
 	Trim         *TrimConfig        `yaml:"trim"`
 	Scriptorium  *ScriptoriumConfig `yaml:"scriptorium"`
 	Analyzer     AnalyzerConfig     `yaml:"analyzer"`
@@ -84,6 +85,15 @@ type AuditaConfig struct {
 	Report                   *bool    `yaml:"report"`
 }
 
+// NormalizeConfig configures normalize-stage transcript schema/output behavior.
+type NormalizeConfig struct {
+	OutputPath   string `yaml:"output_path"`
+	OutputSchema string `yaml:"output_schema"`
+	Report       *bool  `yaml:"report"`
+
+	outputPathSet bool `yaml:"-"`
+}
+
 // TrimConfig configures trim-stage transcript boundary behavior.
 type TrimConfig struct {
 	Enabled    bool               `yaml:"enabled"`