feat: add compatibility setting to strip reference markers from model output and update stream handlers accordingly

internal/textclean/reference_markers.go

@@ -0,0 +1,12 @@
+package textclean
+
+import "regexp"
+
+var referenceMarkerPattern = regexp.MustCompile(`(?i)\[reference:\s*\d+\]`)
+
+func StripReferenceMarkers(text string) string {
+	if text == "" {
+		return text
+	}
+	return referenceMarkerPattern.ReplaceAllString(text, "")
+}