Replace Godot built-in Camera2D smoothing with manual lerp using CAMERA_SMOOTHING_SPEED (8.0) in constants.gd — same exponential smoothing pattern as entity_renderer.gd. Teleport snap preserved via _teleport_in_progress flag. D-015 fixed-north camera lock intact. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>