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Adds per-person constant-velocity Kalman filter that smooths raw 68-point facial landmarks and republishes on /social/faces/landmarks_smooth at input rate. New FaceLandmarks / FaceLandmarksArray messages added to saltybot_social_msgs. 21/21 pure-Python tests pass (no ROS2 required). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>