Function look_at 

pub fn look_at(
    name: &str,
    yaw_key: &str,
    pos_key: &str,
    target_key: &str,
    turn_speed: f32,
    tolerance_rad: f32,
) -> BehaviorNode

Smoothly rotate the agent’s yaw toward a target.

Reads:

• "{yaw_key}" — current yaw angle in radians (f64)
• "{target_key}" — target position (Vec3) or target yaw directly (f64, taken as absolute yaw)
• "{pos_key}" — agent position (Vec3, only needed if target is Vec3)

Writes:

• "{yaw_key}" — updated yaw

Succeeds when angular delta ≤ tolerance_rad.