The signed-in employee now appears automatically at the office entrance in a
blazer with an accent name chip, and moves with WASD or arrow keys: per-axis
wall sliding against the floor-plan colliders, normalized diagonal speed,
facing-aware walk animation, and a camera that follows and clamps to the
world so large teams scroll into view instead of being cut off. Key input
ignores typing targets and releases on window blur. Movement, collision,
spawn stability, and camera clamping are unit-tested.