diff --git a/ai-hub/app/core/orchestration/stream.py b/ai-hub/app/core/orchestration/stream.py
index 88f05b3..7eede54 100644
--- a/ai-hub/app/core/orchestration/stream.py
+++ b/ai-hub/app/core/orchestration/stream.py
@@ -100,6 +100,10 @@
         if processed:
             yield {"type": "content", "content": processed}
 
+    def _apply_turn_header(self, text: str) -> str:
+        """Compatibility shim for old Architect calls. Strips internal markers without adding headers."""
+        return self._apply_header_stripping(text) or ""
+
     def _apply_header_stripping(self, text: str) -> Optional[str]:
         """Strips orchestrator internal markers but does NOT inject its own."""
         if not text: return ""