Space.BoxSourceContinuous vector represented as a float tensor.
create ~low ~high creates a continuous space with bounded ranges.
Valid values are tensors where each element i satisfies low.(i) <= x.(i) <= high.(i). Arrays low and high must have the same length, defining the space dimensionality.
Common use: Observation spaces for continuous state (e.g., position, velocity) or continuous action spaces (e.g., torque, steering angle).