dialogue: a restart expires the parked question (V-385)

The decision, not a behaviour change: ClarifyStore stays in memory, and she
does not announce the loss either.

The TTL and the attempt count measure a pause in one conversation. A restart
is a gap of unknown length, so a restored question is either dead already or
lying about its age, and the request behind it is one he has likely given up
on. Announcing it would mean storing a marker that outlives the thing it
describes, to say one sentence in the rare window where he speaks within 90s
of a restart. His next words route fresh, which is right either way.

Written down in docs/design.md, pinned at both ends by a comment, and held by
a test that builds a second handler over the same store.

cmd/mavend/clarify_test.go

@@ -530,3 +530,23 @@ func TestClarifyIsPerConversation(t *testing.T) {
 func voiceCtx() context.Context {
 	return withDialogueID(context.Background(), dialogueIDFor(sourceVoice, ""))
 }
+
+// TestARestartExpiresTheParkedQuestion pins the Vikunja #385 decision: the
+// question dies with the process, and she does not claim to have let it go —
+// the words that follow are routed as a fresh request. Restarting is modelled
+// the way the daemon does it, by building a second handler over the same store.
+func TestARestartExpiresTheParkedQuestion(t *testing.T) {
+	h, _, _ := newClarifyHandler(t)
+	ctx := voiceCtx()
+	if _, asked := h.askClarify(ctx, clarifyDec(router.IntentReminder, router.Slots{Text: "напомни"}, "напомни")); !asked {
+		t.Fatal("expected a question before the restart")
+	}
+
+	restarted, _, _ := newClarifyHandler(t)
+	if _, handled := restarted.resolveClarifyAnswer(ctx, "в 11:00"); handled {
+		t.Fatal("a question parked before the restart must not eat the next utterance")
+	}
+	if notice := restarted.clarifyExpiredNotice(ctx); notice != "" {
+		t.Fatalf("notice = %q, want silence: nothing survived to expire", notice)
+	}
+}

cmd/mavend/voicewire.go

@@ -238,7 +238,10 @@ func wireVoice(cfg *config.Config, coreAPI ipc.CoreAPI, phr phraser.Phraser, mem
 	// ----- dialogue (multi-turn slot carry-over; 2-min follow-up window) -----
 	// Store-backed when the daemon passes a store, so a restart mid-conversation
 	// keeps the thread (Vikunja #363). Sessions past their TTL are dropped on
-	// load, never revived. Clarify's parked question stays in memory only.
+	// load, never revived. Clarify's parked question stays in memory only, and
+	// that is a decision rather than an omission (Vikunja #385, docs/design.md):
+	// a restart expires it, so the thread comes back and the open question does
+	// not.
 	var dialogueSessions *dialogue.SessionStore
 	if dataStore != nil {
 		dialogueSessions = dialogue.NewPersistentSessionStore(2*time.Minute, dataStore)