fix: deliver validated AI insight responses

internal/growth/ranking_test.go

@@ -0,0 +1,23 @@
+package growth
+
+import "testing"
+
+func TestRankEventPrefersMerchantFitAndHistoricalEvidence(t *testing.T) {
+	base := Event{ImportanceBPS: 8_000, ConfidenceBPS: 9_000, Categories: []string{"فروشگاه"}, Tags: []string{"وب‌سایت"}, LeadDays: 14, CommercialPosture: "PROMOTE"}
+	strong := RankEvent(base, RankInput{MerchantTerms: []string{"فروشگاه", "وب‌سایت"}, WithinPreparationWindow: true, HistoricalUpliftBPS: 12_000, HistoricalEligible: true})
+	weak := RankEvent(base, RankInput{MerchantTerms: []string{"نامرتبط"}})
+	if strong.ScoreBPS <= weak.ScoreBPS {
+		t.Fatalf("merchant fit and history must increase rank: strong=%d weak=%d", strong.ScoreBPS, weak.ScoreBPS)
+	}
+	if len(strong.Factors) < 3 {
+		t.Fatalf("rank factors = %+v, want actionable factors", strong.Factors)
+	}
+}
+
+func TestRankEventNeverPromotesMourningOrNoPromotionEvents(t *testing.T) {
+	for _, event := range []Event{{CommercialPosture: "NO_PROMOTION"}, {CommercialPosture: "PROMOTE", Tone: "MOURNING"}} {
+		if got := RankEvent(event, RankInput{WithinPreparationWindow: true}); got.Promotable {
+			t.Fatalf("event %+v is promotable", event)
+		}
+	}
+}