Function angular_velocity_from_angular_momentum 

pub fn angular_velocity_from_angular_momentum(
    angular_momentum: f64,
    moment_of_inertia: f64,
) -> Option<f64>

Computes angular velocity from angular momentum using ω = L / I.

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