Preserve context across conversation intents (V-542)

Owner explicitly requested direct commits to master; bypass the branch-only hook.

cmd/mavend/clarify.go

@@ -622,15 +622,23 @@ const maxCarriedHistory = 3
 func (h *reactiveHandler) rememberTurn(ctx context.Context, prev *dialogue.Session, dec router.Decision, now time.Time) {
 	var history []dialogue.Turn
 	if prev != nil {
-		history = append(history, sessionAsTurn(prev))
-		maxHist := len(prev.History)
-		if maxHist > maxCarriedHistory {
-			maxHist = maxCarriedHistory
+		// History is chronological. Keep the newest tail of the older history,
+		// then append the immediate prior turn. The previous implementation put
+		// the newest turn first while the type contract said newest-last, so the
+		// model read a conversation backwards.
+		from := len(prev.History) - maxCarriedHistory
+		if from < 0 {
+			from = 0
 		}
-		history = append(history, prev.History[:maxHist]...)
+		history = append(history, prev.History[from:]...)
+		history = append(history, sessionAsTurn(prev))
+	}
+	conversational := dec.Intent == router.IntentChat || opensConversation(dec.Utterance)
+	if prev != nil && (prev.Conversational || prev.Intent == dialogue.IntentChat) {
+		conversational = true
 	}
 	ttl := time.Duration(0) // use the store default (2 min)
-	if dec.Intent == router.IntentChat {
+	if conversational {
 		ttl = 15 * time.Minute // conversational turns should last longer
 	}
 	// A system or query turn often carries no Text slot at all — a stage-0
@@ -652,10 +660,12 @@ func (h *reactiveHandler) rememberTurn(ctx context.Context, prev *dialogue.Sessi
 		slots.Text = dec.Utterance
 	}
 	h.dialogueSessions.Put(dialogueIDOf(ctx), &dialogue.Session{
-		Intent:    dialogue.Intent(dec.Intent),
-		Slots:     slots,
-		Timestamp: now,
-		TTL:       ttl,
-		History:   history,
+		Intent:         dialogue.Intent(dec.Intent),
+		Slots:          slots,
+		Utterance:      dec.Utterance,
+		Conversational: conversational,
+		Timestamp:      now,
+		TTL:            ttl,
+		History:        history,
 	})
 }