fix(cli): show what the run actually produced (#649, #784)

- a non-blank message is text, whatever it would mean as a Python literal
- the live layout renders on the alternate screen, so a tall layout does not scroll
- a run with no readable rating says so instead of looking like a normal result
- the state log keeps non-ASCII readable (#1081)

tests/test_cli_display.py

@@ -0,0 +1,77 @@
+"""What the live display shows, and what the run log keeps.
+
+The display drops a message it judges empty, and the state log is written for a
+person to read afterwards. Both got that wrong in ways that hide real content.
+"""
+
+from __future__ import annotations
+
+import json
+
+import pytest
+
+from cli.main import extract_content_string
+
+
+@pytest.mark.unit
+@pytest.mark.parametrize("text", ["0", "False", "None", "[]", "{}", "0.0"])
+def test_a_message_that_reads_like_a_python_value_is_still_text(text):
+    """These were parsed as Python and judged empty, so the message vanished."""
+    assert extract_content_string(text) == text
+
+
+@pytest.mark.unit
+@pytest.mark.parametrize("value, expected", [
+    ("  Hold  ", "Hold"),
+    ("", None),
+    ("   ", None),
+    (None, None),
+    ([], None),
+    ({}, None),
+    ({"text": "from a dict"}, "from a dict"),
+    ([{"type": "text", "text": "part one"}, {"type": "text", "text": "part two"}], "part one part two"),
+])
+def test_the_other_shapes_are_unchanged(value, expected):
+    assert extract_content_string(value) == expected
+
+
+@pytest.mark.unit
+def test_the_state_log_keeps_non_ascii_readable(tmp_path):
+    """Reports can be in any language; the log is read by a person."""
+    from tradingagents.graph.trading_graph import TradingAgentsGraph
+
+    graph = object.__new__(TradingAgentsGraph)
+    graph.config = {"results_dir": str(tmp_path)}
+    graph.ticker = "600519.SS"
+    graph.log_states_dict = {}
+
+    graph._log_state("2026-09-01", {
+        "company_of_interest": "600519.SS", "trade_date": "2026-09-01",
+        "market_report": "市场", "sentiment_report": "情绪", "news_report": "新闻",
+        "fundamentals_report": "基本面", "investment_plan": "计划",
+        "trader_investment_plan": "交易计划", "final_trade_decision": "评级: 买入",
+        "investment_debate_state": {"bull_history": "", "bear_history": "", "history": "",
+                                    "current_response": "", "judge_decision": "", "count": 0},
+        "risk_debate_state": {"aggressive_history": "", "conservative_history": "",
+                              "neutral_history": "", "history": "", "judge_decision": "",
+                              "latest_speaker": "", "current_aggressive_response": "",
+                              "current_conservative_response": "", "current_neutral_response": "",
+                              "count": 0},
+    })
+
+    written = next(tmp_path.rglob("full_states_log*.json")).read_text(encoding="utf-8")
+    assert "买入" in written
+    assert "\\u" not in written
+    assert json.loads(written)  # still valid JSON
+
+
+@pytest.mark.unit
+def test_the_live_display_does_not_scroll_the_terminal():
+    """A layout taller than the window makes rich redraw by scrolling, which
+    reads as flicker; the alternate screen holds it in place (#784). The final
+    report prints after the live view ends, so nothing is lost when it closes."""
+    import inspect
+
+    import cli.main as m
+
+    assert "screen=True" in inspect.getsource(m.run_analysis)