feat: adiciona Silero VAD local com configuração por ambiente

tests/test_silero_vad_integration.py

@@ -0,0 +1,30 @@
+"""Run the installed Silero ONNX model locally; no STT/TTS service required."""
+
+import socket
+
+import pytest
+
+from voice_assistant.vad.silero import SileroVADAdapter
+
+
+@pytest.fixture
+def anyio_backend():
+    return "asyncio"
+
+
+@pytest.mark.anyio
+async def test_real_silero_processes_silence_without_network(monkeypatch):
+    pytest.importorskip("silero_vad")
+
+    def forbid_network(*args, **kwargs):
+        raise AssertionError("VAD runtime must not open network connections")
+
+    monkeypatch.setattr(socket.socket, "connect", forbid_network)
+    detector = SileroVADAdapter()
+    try:
+        assert await detector.process(bytes(2 * 16000 * 2)) == ()
+        assert await detector.flush() == ()
+        await detector.reset()
+        assert await detector.process(bytes(1024)) == ()
+    finally:
+        await detector.aclose()