feat(conductor): Restore mma_implementation track

gemini_cli_adapter.py

@@ -91,9 +91,13 @@ class GeminiCliAdapter:
                         if "session_id" in data:
                             self.session_id = data.get("session_id")
                     elif msg_type == "message":
-                        content = data.get("content", data.get("text"))
-                        if content:
-                            accumulated_text += content
+                        # CRITICAL: Only accumulate content from the assistant/model role.
+                        # The CLI echoes back the 'user' prompt in the stream, which we must skip.
+                        role = data.get("role", "")
+                        if role in ["assistant", "model"]:
+                            content = data.get("content", data.get("text"))
+                            if content:
+                                accumulated_text += content
                     elif msg_type == "result":
                         self.last_usage = data.get("stats") or data.get("usage")
                         if "session_id" in data: