Apply actual Roto Brush to the upper footage layer. Three layers: processed foreground / MOVE FORWARD text / untouched original background. JSX is an unexecuted starter, not a completed AE project.

1. 导入授权五秒真人影片，建立匹配帧率的合成
2. 在Layer中用当前AI Roto Brush/Object Matte建立前景选区
3. 向前后传播并逐段修正手臂、头发与遮挡边缘
4. 确认完整范围后Freeze，保留可重载工程
5. 按前景/标题/原片顺序建立三层，让大字处于人物背后
6. 导出MP4与Alpha检查帧，检查运动中穿帮并重新打开工程

Target account execution: not performed. Save actual output separately.
