8ec45f3b42
New documentation/operations/nodes.md: HP t740 hardware, disks (SanDisk system SSD 182195804614; Toshiba 1TB NVMe 58BS11AFT8MQ PRESENT AND UNENROLLED, still NTFS, do not touch), the five-NIC map and the trap that cost the first install, and the access path - no SSH key is baked, auth is the hub-vaulted G1 break-glass password. tailscale.md gains demo-hp, the operator-lab-exception warning so a future product-shape audit does not conclude the product ships tailscale, and the --accept-dns evidence: the join omitted the flag, MagicDNS rewrote /etc/resolv.conf, and it was reverted. Harmless at the vacation site, would have bitten silently at home where split-horizon matters. OPEN: key expiry still enabled on demo-hp (2027-01-17) - needs an admin-console toggle or an API token; a pre-auth key cannot do it.