nordisk-pairing 0.5.25

The boxes of an estate find each other: a seed each box is installed with, a one-time join against the front, a tunnel (WireGuard by default) they meet inside, roles decided once, a pairing loop each box runs itself, and the signal it reports. Shared by gunnar and holger; the laptop's xtask only lays machines, writes seeds and reads the signal. Design: .nornir/pairing-design.md (2026-09-24).
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