Evaluate interpolation

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Smooth.lerp and slerp accept shared easing. inverseLerp and remap do not clamp values. smoothDamp(current, target, velocity, smoothTime, delta) returns updated value and velocity; pass the velocity into the next call. It uses an analytic damped spring rather than a frame-rate-dependent fixed fraction. Interpolation exposes the same math. Smoothing is synchronous; actions and callbacks are asynchronous.