fix(dataflows): quote the prices the vendor reported in the verification snapshot

- gap filling keeps indicators on a continuous series, but put the previous session's open, high and low under an unsettled bar's date
- load_ohlcv takes fill_gaps, and the snapshot reads the frame as reported

tests/test_ohlcv_latest_bar.py

@@ -167,3 +167,34 @@ def test_tz_aware_latest_bar_is_kept_at_the_cutoff(monkeypatch, tmp_path):
     out = _run_load(monkeypatch, tmp_path, frame, "2026-05-08")
     assert out["Close"].iloc[-1] == 101.5
     assert out["Date"].iloc[-1] == pd.Timestamp("2026-05-08")
+
+
+@pytest.mark.unit
+def test_the_snapshot_does_not_present_a_filled_price_as_reported(monkeypatch, tmp_path):
+    """Gap filling exists so indicators compute on a continuous series. The
+    verification snapshot is the one place a number must be what the vendor
+    reported, or the module built to stop invented prices supplies them."""
+    from tradingagents.dataflows import market_data_validator as mdv, stockstats_utils as su
+
+    frame = pd.DataFrame({
+        "Date": ["2026-05-06", "2026-05-07", "2026-05-08"],
+        "Open": [100.0, 104.5, ""],     # the latest bar has not settled
+        "High": [101.0, 105.5, ""],
+        "Low": [99.0, 103.5, ""],
+        "Close": [100.5, 105.0, 106.0],
+        "Volume": [1000000, 1000000, ""],
+    })
+    today = pd.Timestamp("2026-05-08 12:00")
+    monkeypatch.setattr(su, "get_config", lambda: {"data_cache_dir": str(tmp_path)})
+    monkeypatch.setattr(su.pd.Timestamp, "today", staticmethod(lambda: today))
+    cache = tmp_path / "AAPL-YFin-data.csv"
+    cache.write_text(frame.to_csv(index=False))
+    os.utime(cache, (today.timestamp(), today.timestamp()))
+    monkeypatch.setattr(su.yf, "download", lambda *a, **k: (_ for _ in ()).throw(
+        AssertionError("should read the seeded cache")))
+
+    out = mdv.build_verified_market_snapshot("AAPL", "2026-05-08", 3)
+
+    row = out.split("Latest verified OHLCV row")[1].split("###")[0]
+    assert "104.50" not in row and "105.50" not in row  # the previous session's numbers
+    assert "106.00" in row  # the close the vendor did report