Added filesystem-based secrets loading configuration

internal/config/validate.go

@@ -33,6 +33,9 @@ func validatePipeline(cfg *PipelineConfig) error {
 	if strings.TrimSpace(cfg.Workspace.Root) == "" {
 		return fmt.Errorf("pipeline.workspace.root is required")
 	}
+	if err := validateSecrets(cfg.Secrets); err != nil {
+		return err
+	}
 	if err := validateWhisperX(cfg.WhisperX); err != nil {
 		return err
 	}
@@ -61,6 +64,16 @@ func validatePipeline(cfg *PipelineConfig) error {
 	return nil
 }
 
+func validateSecrets(cfg *SecretsConfig) error {
+	if cfg == nil {
+		return nil
+	}
+	if strings.TrimSpace(cfg.EnvDir) == "" {
+		return fmt.Errorf("pipeline.secrets.env_dir must be non-empty when pipeline.secrets is configured")
+	}
+	return nil
+}
+
 func validateNormalize(cfg *NormalizeConfig) error {
 	if cfg == nil {
 		return nil