功能：完善通用云管工作台、审计与诊断能力

docs/evidence/linux-gpu-20261111/ubuntu-double-cursor-check.json

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+{"method": "XGetImage-style root capture excludes local X11 cursor; compare clear wallpaper at identical coordinates", "pid": 1067597, "points": [{"point": [900, 900], "video_pixels_changed_over_25": 0, "max_video_channel_difference": 0, "local_shape": [24, 24, 3, 1], "local_opaque_pixels": 254}, {"point": [1300, 900], "video_pixels_changed_over_25": 0, "max_video_channel_difference": 1, "local_shape": [24, 24, 3, 1], "local_opaque_pixels": 254}, {"point": [1800, 900], "video_pixels_changed_over_25": 0, "max_video_channel_difference": 0, "local_shape": [24, 24, 3, 1], "local_opaque_pixels": 254}]}