feat(microphone): PollMonitor meldet fehlendes Gerät sofort beim Start

tests/test_microphone_monitor.py

@@ -65,3 +65,33 @@ async def test_on_device_removed_fires_when_device_disappears():
         monitor.stop()
 
     assert removed == ["Mic B"]
+
+
+@pytest.mark.asyncio
+async def test_on_configured_missing_fires_immediately_at_start():
+    monitor = PollMonitor(configured_device="Headset USB", interval=99.0)
+    missing_called = asyncio.Event()
+
+    async def on_missing() -> None:
+        missing_called.set()
+
+    monitor.on_configured_missing = on_missing
+
+    with patch("sounddevice.query_devices", return_value=_fake_devices(["Mic A"])):
+        await monitor.start()
+
+    assert missing_called.is_set()
+    monitor.stop()
+
+
+@pytest.mark.asyncio
+async def test_on_configured_missing_does_not_fire_when_device_present():
+    monitor = PollMonitor(configured_device="Headset USB", interval=99.0)
+    missing_mock = AsyncMock()
+    monitor.on_configured_missing = missing_mock
+
+    with patch("sounddevice.query_devices", return_value=_fake_devices(["Headset USB", "Mic A"])):
+        await monitor.start()
+
+    missing_mock.assert_not_called()
+    monitor.stop()