Require route evidence in displayed snippets

cmd/core-runtime/main.go

@@ -1838,8 +1838,11 @@ func researchFindingMatchesIntent(query string, finding epistemics.ResearchFindi
 	if len(routeTerms) < 2 {
 		return true
 	}
+	// A route-looking URL or page title alone is not enough for a human-facing
+	// answer: the displayed excerpt itself must support both endpoints.
+	excerptEvidence := strings.ToLower(finding.Excerpt.Text)
 	for _, term := range routeTerms {
-		if !strings.Contains(evidence, term) {
+		if !strings.Contains(excerptEvidence, term) {
 			return false
 		}
 	}

cmd/core-runtime/main_test.go

@@ -52,7 +52,7 @@ func TestNearestFlightEvidenceRequiresBothRouteEndpointsWhenKnown(t *testing.T)
 	if !researchFindingMatchesIntent(query, matched) {
 		t.Fatal("route evidence with both endpoints was rejected")
 	}
-	unrelated := epistemics.ResearchFinding{Source: epistemics.Source{Title: "Ближайшие города к Казани"}, Excerpt: epistemics.SourceExcerpt{Text: "Авиабилеты и расстояние до Казани."}}
+	unrelated := epistemics.ResearchFinding{Source: epistemics.Source{Title: "Рейсы Москва — Казань", Locator: "https://example.test/moscow-kazan"}, Excerpt: epistemics.SourceExcerpt{Text: "Ближайшие к Казани города и расстояние до них."}}
 	if researchFindingMatchesIntent(query, unrelated) {
 		t.Fatal("one-ended travel evidence was accepted")
 	}