Add gated turn start strategy

engine/pipeline.py

@@ -36,6 +36,7 @@ from .services import create_llm_service, create_stt_service, create_tts_service
 from .text_input import ProductTextInputProcessor
 from .text_stream import ProductTextStreamProcessor
 from .transcript_stream import ProductTranscriptStreamProcessor
+from .turn_start import InterruptionGateUserTurnStartStrategy
 
 
 async def run_voice_pipeline(websocket, config: EngineConfig) -> None:
@@ -104,6 +105,13 @@ async def run_pipeline_with_serializer(
     # (re-armed every time the user resumes speaking) before declaring the
     # turn finished — which is what we actually want for streaming ASRs.
     user_turn_strategies = UserTurnStrategies(
+        start=[
+            InterruptionGateUserTurnStartStrategy(
+                min_chars_when_bot_speaking=config.turn.interruption_min_chars,
+                allowed_short_replies=config.turn.interruption_short_replies,
+                use_interim=config.turn.interruption_use_interim,
+            ),
+        ],
         stop=[
             SpeechTimeoutUserTurnStopStrategy(
                 user_speech_timeout=config.turn.user_speech_timeout_sec,