[Pipeline 状态机]：完成TurnController重构，包含wake到standby闭环和错误恢复

src/owner_voice_pet/__init__.py

@@ -1,6 +1,7 @@
 """Owner voice pet pipeline package."""
 
 from .config import AppConfig
+from .assistant_pipeline import TurnController, VoiceAssistantPipeline
 from .events import PipelineEvent, PipelineEventBus
 from .models import (
     AudioFrame,
@@ -30,6 +31,8 @@ from .ui import ConsolePetWindow, PetStateController, PetVisualState
 
 __all__ = [
     "AppConfig",
+    "TurnController",
+    "VoiceAssistantPipeline",
     "PipelineEvent",
     "PipelineEventBus",
     "AudioFrame",