Greg Kurtzer's Ginux is now a userspace kernel

Greg Kurtzer's Ginux project has shifted from being a standalone kernel that boots independently to becoming a userspace kernel that runs as a Linux process. The pivot was driven by the realization that competing with Linux's vast ecosystem is impractical; instead, Ginux now sits above Linux to provide isolated instances with intentionally restricted and versioned system call contracts, allowing it to selectively break the full Linux ABI guarantee for security and compatibility purposes.