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IT11–IT13 mirror IT10 on the Linux platform branch, verifying: - Xvfb workarounds coexist with SOCKS5 proxy mutation - MSAA pin propagates through prefs translation on Linux - _LINUX_GENERIC_FONT_FACTORS is prepended to per-font metrics Tests use monkeypatch on sys.platform so they run on any host OS. Verified green on Linux/WSL alongside the existing Windows tests. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>