mesh-sdk 22c03af carries the machine's tunnel key on the enrolment (OverlayKey, overlay-key, required at every stage), so the holder's wrapper that kept it beside the contract is gone; the wire is unchanged. Test fixtures give the seeded enrolments a real tunnel key, which the contract now requires. (issue 774) Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL