NH3 manager/external-dev box at 10.100.50.42 (Debian 13 VM on nh3-pve),
successor to the retired nh3-ansible. infra-ops identity here is sudo-LESS
by operator decision (2026-06-17): key-only, no NOPASSWD, not in docker
group — user-level management only. Adds servers/nh3-extdev/{README,
ssh-target,system-details.txt}, the CLAUDE.md inventory row, and a local
ssh alias (nh3-extdev -> infra-ops@10.100.50.42, infra-ops key). Login +
sudo-less posture verified.
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