Tell him when an expired clarify question is dropped

Vikunja #382. A parked clarifying question past its TTL was discarded
silently on read; now she says the old request is gone and the newly
spoken words are still routed as a fresh utterance.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CGeSZxh1DCtRxmFVSYVGvJ

cmd/mavend/clarify_test.go

@@ -289,6 +289,36 @@ func TestNoQuestionWhenNothingIsMissing(t *testing.T) {
 	}
 }
 
+// TestClarifyExpiryIsAnnouncedAndWordsStillRoute — his answer lands after the
+// TTL: she must say the old request is gone AND still answer the new words.
+func TestClarifyExpiryIsAnnouncedAndWordsStillRoute(t *testing.T) {
+	ctx := context.Background()
+	h, _, now := newClarifyHandler(t)
+	emb := router.NewHashEmbedder(1024)
+	h.embedder = emb
+	h.router = buildRouter(emb, h.matcher, 0.55, nil)
+
+	if _, asked := h.askClarify(clarifyDec(router.IntentReminder, router.Slots{Text: "напомни"}, "напомни")); !asked {
+		t.Fatal("expected a question")
+	}
+	*now = now.Add(clarifyTTL + time.Second)
+
+	reply := h.handleText(ctx, "как дела")
+	if !strings.HasPrefix(reply, clarifyExpired) {
+		t.Fatalf("expired question must be announced first, got %q", reply)
+	}
+	if strings.TrimSpace(strings.TrimPrefix(reply, clarifyExpired)) == "" {
+		t.Fatalf("the new words must still be answered, got only the notice: %q", reply)
+	}
+	if h.clarifyStore.Get(voiceDialogueID, h.now()) != nil {
+		t.Fatal("the expired question must be gone")
+	}
+	// The notice is said once, not on every later utterance.
+	if reply := h.handleText(ctx, "как дела"); strings.Contains(reply, clarifyExpired) {
+		t.Fatalf("notice repeated on a later turn: %q", reply)
+	}
+}
+
 // TestNoPendingQuestionFallsThrough — with nothing parked, an utterance routes
 // normally.
 func TestNoPendingQuestionFallsThrough(t *testing.T) {