fix(k1): stabilize repeated acquisition and live viewer recovery

tests/test_xgrids_application_mqtt.py

@@ -778,3 +778,36 @@ def test_post_publish_timeout_poisoned_transport_never_retries() -> None:
             required_response_operation_keys={"bootstrap:1:DeviceInfoRequest"},
         )
     assert len(fake.publish_calls) == 1
+
+
+def test_network_loop_failure_keeps_exact_paho_result_and_phase() -> None:
+    class LoopFailureClient(FakeControlClient):
+        def loop(self, timeout: float) -> mqtt.MQTTErrorCode:
+            if self.publish_calls and not self.events:
+                return mqtt.MQTT_ERR_CONN_LOST
+            return super().loop(timeout)
+
+    fake = LoopFailureClient()
+    transport = ReviewedApplicationMqttTransport(
+        "192.168.1.20",
+        client_factory=lambda: cast(mqtt.Client, fake),
+    )
+    transport.open()
+
+    with pytest.raises(
+        ApplicationCommandOutcomeUnknown,
+        match=r"phase=post-publish-drain, result=7: The connection was lost",
+    ):
+        transport.exchange_batch_once(
+            [_envelope()],
+            required_response_operation_keys={"bootstrap:1:DeviceInfoRequest"},
+        )
+
+    snapshot = transport.snapshot().as_dict()
+    assert snapshot["state"] == "poisoned"
+    assert snapshot["last_loop_result_code"] == int(mqtt.MQTT_ERR_CONN_LOST)
+    assert snapshot["last_loop_result_name"] == mqtt.error_string(
+        int(mqtt.MQTT_ERR_CONN_LOST)
+    )
+    assert snapshot["last_loop_phase"] == "post-publish-drain"
+    assert len(fake.publish_calls) == 1