[OpenSpec 与项目骨架]：完成实施型变更与 Python 基础骨架，包含 OpenSpec 工件、核心模型、配置边界和基础测试

src/owner_voice_pet/__init__.py

@@ -0,0 +1,33 @@
+"""Owner voice pet pipeline package."""
+
+from .config import AppConfig
+from .models import (
+    AudioFrame,
+    AudioSegment,
+    ErrorCode,
+    Message,
+    PipelineState,
+    PlaybackResult,
+    ProviderError,
+    ReplyDelta,
+    Transcript,
+    TransportHealth,
+    VadResult,
+    WakeEvent,
+)
+
+__all__ = [
+    "AppConfig",
+    "AudioFrame",
+    "AudioSegment",
+    "ErrorCode",
+    "Message",
+    "PipelineState",
+    "PlaybackResult",
+    "ProviderError",
+    "ReplyDelta",
+    "Transcript",
+    "TransportHealth",
+    "VadResult",
+    "WakeEvent",
+]