Make the operator's requirement explicit: default (every pod + the nodes) egresses the local/private WAN, never the VPN; VPN is strictly opt-in via egress-class=vpn; the kill-switch blackholes ONLY vpn-class. The two classes fail in opposite directions — internet fails open (WAN), vpn fails closed (blackhole). Added as ADR-0015 Invariants + a default-WAN principle in docs/03, gated by the egress-class/vpn-killswitch conformance tests. Co-Authored-By: Claude Opus 4.8 <[email protected]>