mavend: an unconfigured capability names the gap (V-479)

Netscan and the crawler both declined their own turn when the wiring was
nil, and the question fell through to the search leg. "какие устройства в
сети?" came back as a paragraph about routers in general, and a question
about his own LAN went to an upstream engine — the personal boundary
exists to stop exactly that. A URL he named came back answered as though
he had not named it.

Both now claim the turn once their own recogniser has matched, and say
which capability is missing: net_off and page_off in the query family.

TestQueryWebPassesWhenNotConfigured encoded the old decision, that
announcing a configuration status is only for a capability that exists and
failed. It is rewritten, not deleted: the gap is the answer now.

internal/phraser/query_ru_v1.json

@@ -62,6 +62,14 @@
       "fixed": true,
       "variants": ["не знаю, для какого города — задай voice.weather.default_location или назови город."]
     },
+    "net_off": {
+      "fixed": true,
+      "variants": ["сканирование сети не настроено."]
+    },
+    "page_off": {
+      "fixed": true,
+      "variants": ["я не читаю страницы — это не настроено."]
+    },
     "net_empty": {
       "variants": ["в сети никого не нашла{tail}.", "никого в сети не видно{tail}."]
     },