fix(deploy): accept Manager v3 private egress

infra/deploy-runner/test_device_plane_registry.py

@@ -268,6 +268,33 @@ class DevicePlaneRegistryTest(unittest.TestCase):
             ],
         )
 
+    def test_manager_v3_post_apply_uses_private_egress_core_boundary(self):
+        with (
+            mock.patch.object(
+                RUNNER,
+                "healthcheck_compose_service_with_grace",
+            ),
+            mock.patch.object(
+                RUNNER,
+                "component_healthchecks",
+                return_value=(),
+            ),
+            mock.patch.object(
+                RUNNER,
+                "validate_device_manager_control_plane_runtime",
+            ) as runtime_acceptance,
+        ):
+            RUNNER.run_healthchecks(
+                "device-plane",
+                RUNNER.DEVICE_PLANE_MANAGER_RELEASE_V3_ENTRIES,
+                ("device-manager",),
+            )
+
+        runtime_acceptance.assert_called_once_with(
+            require_edge_channel=True,
+            core_network_mode="private-egress",
+        )
+
     def test_manager_predecessor_health_is_phase_scoped(self):
         with self.assertRaisesRegex(
             RUNNER.DeployError,