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>

internal/router/eval/eval_test.go

@@ -236,6 +236,7 @@ func newBaselineRouter(t *testing.T, emb router.Embedder, llmR *router.LLMRouter
 	// Same order as buildRouter (voicewire.go). The fixture is only worth
 	// anything while its grammar set is the daemon's grammar set.
 	grammars = append(grammars, router.AgendaQueryGrammars()...)
+	grammars = append(grammars, router.FeedQueryGrammar())
 	grammars = append(grammars, router.ReminderGrammar())
 	return router.New(router.Config{
 		Grammars:   grammars,

internal/router/feedgrammar_test.go

@@ -0,0 +1,55 @@
+package router
+
+import (
+	"context"
+	"testing"
+)
+
+func feedRouter(t *testing.T) *Router {
+	t.Helper()
+	r := newTestRouter(t, 0.0)
+	r.grammars = append(r.grammars, SystemTimeDateGrammars()...)
+	r.grammars = append(r.grammars, AgendaQueryGrammars()...)
+	r.grammars = append(r.grammars, FeedQueryGrammar())
+	return r
+}
+
+// The documented utterance of task 258 step 1 routed system and answered
+// "пока не умею отвечать на этот вопрос.", while the same question worded with
+// "новостях" worked (Vikunja #474).
+func TestFeedQuestionsRouteToQuery(t *testing.T) {
+	r := feedRouter(t)
+	for _, u := range []string{
+		"что нового в лентах?",
+		"что в лентах?",
+		"расскажи что в новостных лентах",
+		"покажи ленту",
+	} {
+		d, err := r.Route(context.Background(), u, refNow())
+		if err != nil {
+			t.Fatalf("route(%q): %v", u, err)
+		}
+		if d.Intent != IntentQuery {
+			t.Errorf("route(%q) = %s, want query", u, d.Intent)
+		}
+	}
+}
+
+// The greeting and the statement keep their intents. "что нового?" is the most
+// common opener in the language, and a rule that claimed it would answer hello
+// with a configuration status.
+func TestFeedGrammarLeavesTheGreetingAlone(t *testing.T) {
+	r := feedRouter(t)
+	for _, u := range []string{
+		"что нового?",
+		"у меня новая лента в инстаграме",
+	} {
+		d, err := r.Route(context.Background(), u, refNow())
+		if err != nil {
+			t.Fatalf("route(%q): %v", u, err)
+		}
+		if d.Stage == 0 {
+			t.Errorf("route(%q) was claimed at stage 0 as %s", u, d.Intent)
+		}
+	}
+}

internal/router/stage0.go

@@ -208,13 +208,39 @@ func AgendaQueryGrammars() []Grammar {
 	}
 }
 
+// FeedQueryGrammar — stage-0 rule for "что нового в лентах?", routed to
+// IntentQuery so it reaches queryFeeds.
+//
+// Same shape of defect as the agenda grammars: the model calls it system, and
+// replySystem has no feeds arm, so the documented utterance of task 258 step 1
+// answered "пока не умею отвечать на этот вопрос." while the same question
+// worded with "новостях" worked (Vikunja #474).
+//
+// An ask word at the front and a feed noun after it are both required, which
+// is the same pair ParseFeedQuery wants. "что нового?" on its own is a greeting
+// — the most common opener in the language — and vagueNouns in feeds.go exists
+// to keep it out of the feed reader; routing it to query here would put it
+// back. "у меня новая лента в инстаграме" carries the noun without the ask and
+// stays the statement it is.
+func FeedQueryGrammar() Grammar {
+	return Grammar{
+		Name: "feed-query",
+		// (\s|[?!.]|$) rather than \b, which is ASCII-only and never fires next
+		// to a Cyrillic letter.
+		Pattern: regexp.MustCompile(`(?i)^\s*(что|какие|расскажи|покажи|почитай|прочитай)\s+.*(лент|новостн)[а-я]*(\s|[?!.]|$)`),
+		Build:   agendaQueryBuild,
+	}
+}
+
 // dayWordPattern — the day words an agenda question can name. Weekdays appear
 // in the accusative and prepositional forms the questions actually use ("в
 // среду", "на среде"), which is why the stems carry an inflection tail rather
 // than a fixed ending.
 const dayWordPattern = `(сегодня|завтра|послезавтра|выходн[а-я]+|недел[а-я]+|понедельник[а-я]*|вторник[а-я]*|сред[ауые][а-я]*|четверг[а-я]*|пятниц[ауые][а-я]*|суббот[ауые][а-я]*|воскресень[ея][а-я]*)`
 
-// agendaQueryBuild — shared Build for the agenda grammars. Confidence 1.0 on
+// agendaQueryBuild — shared Build for the agenda grammars and the feed one,
+// which all do the same single thing: keep the utterance out of IntentSystem
+// and let the query chain decide who answers it. Confidence 1.0 on
 // the intent only: the utterance travels intact and the query chain's own
 // matchers decide the rest.
 func agendaQueryBuild(m []string) (Decision, bool) {