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fix: harden_sysctl/harden_attack_surface robustness - #27
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- Skip user.max_user_namespaces=0 when container runtimes are present. - Make sysctl metrics counting robust against grep -c exit status. - Back up sshd_config.d drop-ins before SSH crypto changes and revert them.
This was referenced Oct 9, 2026
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Small correctness/robustness follow-up, no behavior change except safer guards:
Validation: bash -n clean locally; CI must pass before merge.