2V1-e: live login smoke harness (port.login_live)

port_login_flow_test gains a `live` mode that runs the same script path
against a real 40250 server and checks the client's own state: the
character list, then LoadingWindow.LoadData from GC_MAIN_CHARACTER (which
CPythonNetworkStream answers with CG_CLIENT_VERSION), exiting before the
game phase. Host, ports, account and slot come only from MT_LIVE_* env
vars, are handed to Python as objects and never printed; without them
the test skips. Not yet run live: the server was unreachable today.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

extension/src/port/CMakeLists.txt

@@ -219,6 +219,10 @@ if(BUILD_TESTING AND CMAKE_SYSTEM_NAME STREQUAL CMAKE_HOST_SYSTEM_NAME)
         add_test(NAME port.login_flow
                  COMMAND $<TARGET_FILE:port_login_flow_test> ${MT_40250_CLIENT} ${MT_PYTHON_STDLIB_ZIP})
         set_tests_properties(port.login_flow PROPERTIES SKIP_RETURN_CODE 77)
+        # 2V1-e: the same path against a live 40250 server; skipped unless MT_LIVE_* is set (see the test).
+        add_test(NAME port.login_live
+                 COMMAND $<TARGET_FILE:port_login_flow_test> ${MT_40250_CLIENT} ${MT_PYTHON_STDLIB_ZIP} live)
+        set_tests_properties(port.login_live PROPERTIES SKIP_RETURN_CODE 77 RUN_SERIAL TRUE)
 
         add_executable(port_python_ui_modules_test ${CMAKE_CURRENT_SOURCE_DIR}/../../tests/port_python_ui_modules_test.cpp)
         target_link_libraries(port_python_ui_modules_test PRIVATE port_platform)