The web front kept nothing on the bus: whether grafana or drive was routed, where to, with which
certificate, and what it last answered could only be learned with curl or the container's log.
The proxy now keeps `routes` and `unrouted` (announced readable, keyed <node>.<name>), written on
change by one writer: route set changes, certificates stored by autocert's cache or failing at a
handshake, upstream answers that differ from the last written (or are a minute old), and names
refused in a request or a handshake. The provider helper's bundle serves route_proxy_routes,
route_proxy_route and route_proxy_unrouted from those states.
Quick: log the routes at start and grep the journal. Thorough: the state on the bus and the tools
that read it, mesh-wide, in one call. Chose thorough: the operator's question is mesh-wide and
recurs, and the log says nothing about certificates or answers.
Tests: two table tests added (the ledger, the tools), both failing without the change; four
authority tests and four skipped-route tests merged into two, so the module has four fewer.
