fix: deliver validated AI insight responses

internal/growth/analytics_test.go

@@ -46,6 +46,28 @@ func TestMatchUpcomingEventsPrefersFamilyThenTags(t *testing.T) {
 	}
 }
 
+func TestBuildOpportunitiesReturnsThreeNearestCommercialEventsWithoutHistoricalWins(t *testing.T) {
+	start := date("2026-08-21")
+	forecast := Forecast{Confidence: ConfidenceMedium}
+	for day := start; day.Before(start.AddDate(0, 0, 120)); day = day.AddDate(0, 0, 1) {
+		forecast.Points = append(forecast.Points, ForecastPoint{
+			Date: day, PaidSessions: Range{P10: 80, P50: 100, P90: 120},
+			PaidAmountRial: Range{P10: 800, P50: 1000, P90: 1200},
+		})
+	}
+	catalog := filterCatalog(testCatalog(), "مراکز آموزشی مجازی")
+	got := buildOpportunities(nil, catalog, forecast, start, 3)
+	if len(got) != 3 {
+		t.Fatalf("got %d opportunities, want 3: %+v", len(got), got)
+	}
+	want := []string{"back-to-school-1405", "autumn-opening-1405", "halloween-2026"}
+	for index, id := range want {
+		if got[index].EventID != id {
+			t.Fatalf("opportunity %d = %q, want %q", index, got[index].EventID, id)
+		}
+	}
+}
+
 func TestBuildForecastReturnsOrderedNinetyDayIntegerRanges(t *testing.T) {
 	start := date("2026-07-01")
 	history := make([]DailyPoint, 0, 112)