feat(config): benchmark B3 tickers against the Ibovespa (#1366)

- .SA maps to ^BVSP

tests/test_memory_log.py

@@ -629,6 +629,14 @@ class TestDeferredReflection:
         # .SH is the exchange's own suffix; Yahoo spells Shanghai .SS (#1260)
         assert TradingAgentsGraph._resolve_benchmark(mock_graph, "600519.SH") == "000001.SS"
 
+    def test_resolve_benchmark_brazil(self):
+        """B3 tickers were measured against SPY."""
+        from tradingagents.default_config import DEFAULT_CONFIG
+        mock_graph = MagicMock(spec=TradingAgentsGraph)
+        mock_graph.config = {"benchmark_ticker": None,
+                             "benchmark_map": DEFAULT_CONFIG["benchmark_map"]}
+        assert TradingAgentsGraph._resolve_benchmark(mock_graph, "PETR4.SA") == "^BVSP"
+
     def test_resolve_benchmark_us_ticker_defaults_to_spy(self):
         """US tickers (no dotted suffix) take the empty-suffix entry."""
         mock_graph = MagicMock(spec=TradingAgentsGraph)

tradingagents/default_config.py

@@ -168,6 +168,7 @@ DEFAULT_CONFIG = _apply_env_overrides({
         ".AX":  "^AXJO",       # Australia (ASX 200)
         ".SS":  "000001.SS",   # Shanghai (SSE Composite)
         ".SZ":  "399001.SZ",   # Shenzhen (SZSE Component)
+        ".SA":  "^BVSP",       # B3 Brazil (Ibovespa)
         "":     "SPY",         # default for US-listed tickers (no suffix)
     },
 })