mavend, router: stop three sources claiming turns the world should answer (V-474)

The querySources order predates the 2026-08-02 ruling that live search leads.

An unconfigured feeds source claimed every news question and answered with a
configuration status, so "что происходит сейчас в новостях про искусственный
интеллект?" never reached the search sitting one source below. It now claims
only when neither SearXNG nor the ZIMs are configured, which is the case the
"не читаю ленты" line was written for — general knowledge would otherwise
invent a bulletin.

The calendar matches on a day word alone and sits above the weather, so
"какая сегодня погода в Москве?" answered "на 02.08.2026 ничего нет." It now
steps aside on weather wording, the same bail-out queryHome already does.

"что нового в лентах?" routed system and answered "пока не умею", while the
same question worded with "новостях" worked. FeedQueryGrammar routes it to
query at stage 0, requiring an ask word and a feed noun so the bare greeting
"что нового?" stays a greeting. Wired in the eval too, since the fixture is
only worth anything while its grammar set is the daemon's.

Also: the claiming source is now logged. /trace is the nudge-rule trace and
carries no query-source field, so a wrong answer could not be told apart from
a wrongly-ordered chain.

Kiwix having no live coverage is filed separately as V-508 — it is a decision
about search quality, not an ordering fix.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

cmd/mavend/actions_query.go

@@ -145,6 +145,13 @@ func (h *reactiveHandler) actionQuery(ctx context.Context, dec router.Decision)
 			continue
 		}
 		if reply, ok := src.answer(h, ctx, t); ok {
+			// Which source claimed is the one thing about a query turn that was
+			// invisible from outside: /trace is the nudge-rule trace and carries
+			// no query-source field, so a wrong answer could not be told from a
+			// wrongly-ordered chain (Vikunja #474). Only the name is logged —
+			// the utterance and the answer are already on the voice lines above
+			// and below this one.
+			log.Printf("voice: query claimed by source %q", src.name)
 			return reply
 		}
 	}
@@ -283,9 +290,17 @@ func (h *reactiveHandler) queryFeeds(ctx context.Context, t *queryTurn) (string,
 		return "", false
 	}
 	if !h.feedsOn {
-		// Claim the turn rather than fall through: "не читаю ленты" is true, and
-		// letting general knowledge answer "что нового?" would be an invented
-		// news bulletin.
+		// Claim only when nothing below can read the world. The reason this
+		// source used to claim unconditionally was that general knowledge would
+		// answer "что нового?" with an invented news bulletin — true, and it
+		// stopped being the only alternative on 2026-08-02, when live search
+		// took the lead. With SearXNG or the ZIMs configured, "что происходит
+		// в новостях про искусственный интеллект?" has a real answer below,
+		// and a configuration status is the wrong thing to say instead
+		// (Vikunja #474).
+		if h.search != nil || h.kiwix != nil {
+			return "", false
+		}
 		return "я пока не читаю ленты — они не настроены.", true
 	}
 	// By source, not the last 200 notes of any kind: a busy day of voice notes
@@ -322,6 +337,15 @@ func (h *reactiveHandler) queryFeeds(ctx context.Context, t *queryTurn) (string,
 // h.now(), not time.Now(): the handler's clock is the injected one, so this
 // source can be tested at a fixed time like the rest.
 func (h *reactiveHandler) queryCalendar(ctx context.Context, t *queryTurn) (string, bool) {
+	// A day word is all this source matches on, so any question that merely
+	// names a day reached it first. "какая сегодня погода в Москве?" answered
+	// "на 02.08.2026 ничего нет." (Vikunja #474). Weather is asked about a day
+	// far more often than the calendar is, and the weather source sits right
+	// below, so the calendar steps aside on weather wording — the same bail-out
+	// queryHome already does for the same reason.
+	if isWeatherQuery(t.dec.Utterance) {
+		return "", false
+	}
 	date, ok := router.ParseCalendarDate(t.dec.Utterance, h.now())
 	if !ok {
 		return "", false