seamlessClone Poisson blend — boundary fundamentally fixed
После TASK-092 mask feather + TASK-096 LS 1.6 user caught residual rounded-rectangle boundary на face. Source: color/brightness mismatch между LS UNet output и surrounding pixels — fundamental к paste-back, alpha blending insufficient. Fix: OpenCV seamlessClone Poisson blending post-process в restore_img + larger blur (161 vs 81). Episode #11 v7 deployed — boundary gone.