Added support for a minimal JSON output schema

internal/artifact/transcript.go

@@ -57,6 +57,41 @@ func FromMerged(cfg config.Config, merged model.MergedTranscript) schema.Transcr
 	}
 }
 
+// MinimalFromMerged converts the internal merged transcript model into the
+// compact public serialized output contract.
+func MinimalFromMerged(cfg config.Config, merged model.MergedTranscript) schema.MinimalTranscript {
+	segments := make([]schema.MinimalSegment, len(merged.Segments))
+	for index, segment := range merged.Segments {
+		segments[index] = schema.MinimalSegment{
+			ID:      segment.ID,
+			Start:   segment.Start,
+			End:     segment.End,
+			Speaker: segment.Speaker,
+			Text:    segment.Text,
+		}
+	}
+
+	return schema.MinimalTranscript{
+		Metadata: schema.MinimalMetadata{
+			Application:  ApplicationName,
+			Version:      buildinfo.Version,
+			OutputSchema: config.OutputSchemaMinimal,
+		},
+		Segments: segments,
+	}
+}
+
+// SelectedFromMerged converts the internal merged transcript model into the
+// runtime-selected public output contract.
+func SelectedFromMerged(cfg config.Config, merged model.MergedTranscript) any {
+	switch cfg.OutputSchema {
+	case config.OutputSchemaMinimal:
+		return MinimalFromMerged(cfg, merged)
+	default:
+		return FromMerged(cfg, merged)
+	}
+}
+
 func copyIntPtr(value *int) *int {
 	if value == nil {
 		return nil