Water Tank Process Physics

Simulate a simple water storage tank with the following characteristics:

- Tank capacity: approximately 1 meter maximum water height
- Medium-sized industrial tank (cross-section area around 1 m^2)
- Gravity-driven outflow through a drain valve
- Controllable inlet valve (on/off) for filling
- Initial water level at 50% capacity

The tank should:
- Fill when the inlet valve is commanded open
- Drain naturally through gravity when not filling
- Maintain realistic physics (water doesn't go negative or above max)

Use the physical_values keys from the HIL configuration to map:
- Tank level state (output to sensors)
- Inlet valve command (input from actuators)
- Level measurement for sensors (output)

Simulation should run at approximately 10 Hz (dt around 0.1 seconds).