feat: add persisted page insight platform

internal/eventcatalog/recurrence_validation_test.go

@@ -0,0 +1,14 @@
+package eventcatalog
+
+import "testing"
+
+func TestValidateEventsRejectsIncorrectBlackFridayDate(t *testing.T) {
+	event := Event{ID: "black-friday-2026", TitleFA: "جمعه سیاه", StartDate: "2026-11-26", EndDate: "2026-11-26", Recurrence: RecurrenceBlackFriday, Type: TypeCommercial, Tone: ToneNeutral, CommercialPosture: PostureCaution, SourceURI: "https://example.test/black-friday", SourceVersion: "2026", InclusionRationale: "رفتار تجاری مرتبط", GeographicScope: "IR", RelevanceBPS: 8000, ConfidenceBPS: 8000}
+	if err := ValidateEvents([]Event{event}); err == nil {
+		t.Fatal("expected recurrence mismatch")
+	}
+	event.StartDate, event.EndDate = "2026-11-27", "2026-11-27"
+	if err := ValidateEvents([]Event{event}); err != nil {
+		t.Fatal(err)
+	}
+}