Banger was already serving VM records on 127.0.0.1:42069, but hosts using systemd-resolved were not routing .vm queries there. That made direct lookups against the local server work while normal host resolution and commands like opencode attach <vm>.vm:4096 failed.\n\nSync resolvectl dns/domain/default-route settings onto the banger bridge when the daemon opens and whenever VM DNS records are published, and revert that bridge-scoped configuration on daemon shutdown. This uses sudo resolvectl because unprivileged resolved reconfiguration on this host requires interactive authentication.\n\nValidation: GOCACHE=/tmp/banger-gocache go test ./..., make build, daemon restart, resolvectl dns/domain br-fc, resolvectl query vrum.vm, and curl http://vrum.vm:4096.
