feat(news): configurable fetch params via DEFAULT_CONFIG

Per-ticker article limit, global article limit, global lookback
window, and macro query list are now read from get_config()
instead of being hardcoded. Tool wrapper get_global_news passes
None defaults so config overrides flow through the LLM-tool path
too. Macro query defaults broadened from 4 US-centric strings to
5 covering Fed, S&P 500, geopolitics, ECB/BOJ/BOE, commodities.

#606 #558 #562

tradingagents/default_config.py

@@ -35,6 +35,21 @@ DEFAULT_CONFIG = {
     "max_debate_rounds": 1,
     "max_risk_discuss_rounds": 1,
     "max_recur_limit": 100,
+    # News / data fetching parameters
+    # Increase for longer lookback strategies or to broaden macro coverage;
+    # decrease to reduce token usage in agent prompts.
+    "news_article_limit": 20,             # max articles per ticker (ticker-news)
+    "global_news_article_limit": 10,      # max articles for global/macro news
+    "global_news_lookback_days": 7,       # macro news lookback window
+    # Search queries used by get_global_news for macro headlines. Extend or
+    # replace to broaden geographic / sector coverage.
+    "global_news_queries": [
+        "Federal Reserve interest rates inflation",
+        "S&P 500 earnings GDP economic outlook",
+        "geopolitical risk trade war sanctions",
+        "ECB Bank of England BOJ central bank policy",
+        "oil commodities supply chain energy",
+    ],
     # Data vendor configuration
     # Category-level configuration (default for all tools in category)
     "data_vendors": {