This is the contents of robotCommand (roborio, but systemcore will be similar):
https://github.com/robotpy/robotpy-installer/blob/main/robotpy_installer/cli_deploy.py#L617
That calls `python -m robotpy` with a `run` argument:
https://github.com/robotpy/robotpy-cli/blob/main/robotpy/main.py#L197
That function is the thing that finds `robot.py` and loads a robot class from it. It then loads the `run` entrypoint and passes the robot class to it.
That entrypoint is in the wpilib package:
https://github.com/robotpy/mostrobotpy/blob/main/subprojects/robotpy-wpilib/pyproject.toml#L36
Which causes this class's `run` function to be called:
https://github.com/robotpy/mostrobotpy/blob/main/subprojects/robotpy-wpilib/wpilib/_impl/start.py#L89
Which then calls the `main` function of the robot class, which then does whatever it needs to do to continue getting the robot to work.
