Also interpolate taxi and interactive objects

CHARACTER_INTERPOLATION.md

@@ -44,6 +44,15 @@ Dialogue typewriter text and cutscene presentation timers use the same
 per-render-frame path. This keeps character reveals, subtitle timing, fades, and
 cutscene image poses smooth instead of stepping in 100 ms increments.
 
+Interactive objects retain authoritative move, rotate, scale, and fade tasks on
+the simulation tick. Their previous and current visual transforms are sampled
+at tick boundaries and interpolated only while drawing, so doors and similar
+objects remain logically deterministic while their presentation is smooth.
+
+The same render-only sampling is used for `NpcCar` taxi visuals. Its position,
+body rotation, wheel rotation, and steering angle are interpolated for drawing;
+the authoritative taxi movement and waypoint logic remain fixed-step.
+
 ## Animation skinning
 
 GPU and CPU bone interpolation receive the fractional render frame instead of an