tests: use INDICONFIG-scoped temp dir instead of ~/.indi for cordwrap config tests - #1357

System tests for cord-wrap config persistence were reading and writing ~/.indi/Celestron AUX_config.xml directly — clobbering a developer's real driver config and creating test order/environment dependencies.

Changes

• conftest.py: Added a session-scoped local_config_dir fixture that creates a pytest-managed temp directory and sets INDICONFIG to it. indiserver_process now depends on this fixture, ensuring the env var is in place before the driver process starts.

@pytest.fixture(scope="session")
def local_config_dir(tmp_path_factory):
    config_dir = tmp_path_factory.mktemp("indi_config")
    os.environ["INDICONFIG"] = str(config_dir)
    yield str(config_dir)
    os.environ.pop("INDICONFIG", None)

@pytest.fixture(scope="session")
def indiserver_process(simulator_process, local_config_dir):
    ...

• test_cordwrap.py (new): get_config_value() reads os.environ["INDICONFIG"] with no ~/.indi fallback — a missing env var raises KeyError rather than silently reading the real user config.