Function angular_velocity_from_tangential_speed 

pub fn angular_velocity_from_tangential_speed(
    tangential_speed: f64,
    radius: f64,
) -> Option<f64>

Computes angular velocity from tangential speed using ω = v / r.

Returns None when radius is less than or equal to zero, when any input is not finite, or when the computed angular velocity is not finite.