"""User-authored plant environments (spec FR-8.2.17).

Each module here is loadable by reference:

    wago-sim serve --node ... --env envs.pump_station_env:PumpStationEnv
    wago-sim sim     --node ... --env envs.pump_station_env:make_env
    wago-sim serve --node ... --env envs.pump_station_env   # picks Env
"""