Update asr interim

engine/core/duplex_pipeline.py

@@ -414,6 +414,8 @@ class DuplexPipeline:
             )
         })
 
+        if not is_final:
+            logger.info(f"ASR interim: {text[:100]}")
         logger.debug(f"Sent transcript ({'final' if is_final else 'interim'}): {text[:50]}...")
 
     async def _on_speech_start(self) -> None:
@@ -463,14 +465,16 @@ class DuplexPipeline:
 
         logger.info(f"EOU detected - user said: {user_text[:100]}...")
 
-        # Send final transcription to client
-        await self.transport.send_event({
-            **ev(
-                "transcript.final",
-                trackId=self.session_id,
-                text=user_text,
-            )
-        })
+        # For ASR backends that already emitted final via callback,
+        # avoid duplicating transcript.final on EOU.
+        if user_text != self._last_sent_transcript:
+            await self.transport.send_event({
+                **ev(
+                    "transcript.final",
+                    trackId=self.session_id,
+                    text=user_text,
+                )
+            })
 
         # Clear buffers
         self._audio_buffer = b""