Function final_angular_velocity_from_displacement 

pub fn final_angular_velocity_from_displacement(
    initial_angular_velocity: f64,
    angular_acceleration: f64,
    angular_displacement: f64,
) -> Option<f64>

Computes final angular velocity using ω_final = sqrt(ω_initial² + 2αθ).

Returns None when the squared value is negative, when any input is not finite, or when the computed angular velocity is not finite.