final LlmChatRequest request = new LlmChatRequest();
        client.testAddIntentHistory(request, history);
        // Default: maxMessages=6, maxChars=3000
        // From newest: A2(2), Q2(2+2=4), assistant(500+4=504), Short(5+504=509) => all fit
        assertEquals(4, request.getMessages().size());
    }

    @Test
    public void test_addIntentHistory_maxMessages() {