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Addresses PR feedback from @magi: kernel string `4.4.0` is also the Ubuntu 16.04 LTS / older-real-kernel version, so accepting it alone false-positives. Now `4.4.0` only counts as gVisor when /proc/version also contains "gVisor". `*-gvisor` kernel strings remain standalone- sufficient since no real production kernel reports them. Adds a regression test that an Ubuntu 16.04 box reporting `Linux version 4.4.0-1128-aws (buildd@lcy01)` is NOT classified as a gVisor sandbox. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>