Serve route-proxy's routes through its own contract: decode each plan entry's opaque contribution with it, say each name served, withdrawn or refused on the bus, and take who is inside from the seat mesh-placement, since the membership went with the assignments stream (issue 774, research 072 rows 33 and 34)

modules/route-proxy/module.json

@@ -245,6 +245,11 @@
     "route_proxy_route",
     "route_proxy_unrouted"
   ],
+  "emits": [
+    "route.served",
+    "route.withdrawn",
+    "route.refused"
+  ],
   "replaces": {
     "route_proxy_routes": [
       "curl -I"
@@ -257,6 +262,7 @@
     ]
   },
   "reads": [
+    "mesh-delivery-assigner.placement",
     "mesh-provisioner.plans",
     "mesh-provisioner.provisions"
   ]