Add trim configuration contract

internal/config/validate.go

@@ -42,6 +42,9 @@ func validatePipeline(cfg *PipelineConfig) error {
 	if err := validateAudita(cfg.Audita); err != nil {
 		return err
 	}
+	if err := validateTrim(cfg.Trim); err != nil {
+		return err
+	}
 	if err := validateScriptorium(cfg.Scriptorium); err != nil {
 		return err
 	}
@@ -55,6 +58,36 @@ func validatePipeline(cfg *PipelineConfig) error {
 	return nil
 }
 
+func validateTrim(cfg *TrimConfig) error {
+	if cfg == nil {
+		return nil
+	}
+	if !cfg.Enabled {
+		return nil
+	}
+
+	if strings.TrimSpace(cfg.OutputPath) == "" {
+		return fmt.Errorf("pipeline.trim.output_path is required when pipeline.trim.enabled is true")
+	}
+	if strings.TrimSpace(cfg.Bounds.PromptID) == "" {
+		return fmt.Errorf("pipeline.trim.bounds.prompt_id is required when pipeline.trim.enabled is true")
+	}
+	if strings.TrimSpace(cfg.Bounds.TranscriptInputName) == "" {
+		return fmt.Errorf("pipeline.trim.bounds.transcript_input_name is required when pipeline.trim.enabled is true")
+	}
+	if strings.TrimSpace(cfg.Bounds.OutputPath) == "" {
+		return fmt.Errorf("pipeline.trim.bounds.output_path is required when pipeline.trim.enabled is true")
+	}
+	if err := validateDuration("pipeline.trim.bounds.timeout", cfg.Bounds.Timeout); err != nil {
+		return err
+	}
+	if cfg.Bounds.RenderDebug && strings.TrimSpace(cfg.Bounds.RenderOutputPath) == "" {
+		return fmt.Errorf("pipeline.trim.bounds.render_output_path is required when pipeline.trim.bounds.render_debug is true")
+	}
+
+	return nil
+}
+
 func validateWhisperX(cfg WhisperXConfig) error {
 	if strings.TrimSpace(cfg.TranscribeURL) == "" {
 		return fmt.Errorf("pipeline.whisperx.transcribe_url is required")