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Dev Scribe
aea147fbb9
"No IPv4 yet" is also the state of a dual-stack network whose router advertisement arrived before the DHCPv4 ACK. In that window the DHCP read fails, configd has no IPv4 state, and the interface holds only SLAAC IPv6, so a single IPv6-only observation could write 127.0.0.53 on a service that provides IPv4 DNS seconds later. The IPv6-only evidence must now hold on the same service and device for 15 seconds before it admits a target. The first observation starts the clock and schedules one confirming reconcile. Any pass that reads the evidence and finds a readable lease, IPv4 state, CLAT, or a different service ends the confirmation without a write. Shutdown drops a pending confirmation. CLAT evidence still admits immediately. Review follow-ups: the service-name and networksetup mapping tail is a shared reader helper, the IPv6 interface check uses an escaped tab, and nativeIPv6OnlyAddresses has its own table test.