feat(data): add FRED macro indicators as an optional vendor

Surface Federal Reserve Economic Data (rates, inflation, labor, growth) to the
news analyst via a new get_macro_indicators tool and a macro_data vendor
category. Friendly aliases (cpi, unemployment, fed_funds_rate, 10y_treasury,
yield_curve, ...) map to FRED series IDs; raw series IDs are accepted too. The
report gives the latest value, change over the window, and a recent observation
table. Windowing is lookahead-safe (observation_end = curr_date), missing values
are skipped, and a missing FRED_API_KEY surfaces as a clear not-configured
condition through the vendor router rather than a crash.

tradingagents/dataflows/interface.py

@@ -24,6 +24,7 @@ from .alpha_vantage import (
     get_global_news as get_alpha_vantage_global_news,
 )
 from .alpha_vantage_common import AlphaVantageRateLimitError
+from .fred import get_macro_data as get_fred_macro_data
 from .symbol_utils import NoMarketDataError
 
 # Configuration and routing logic
@@ -61,11 +62,18 @@ TOOLS_CATEGORIES = {
             "get_global_news",
             "get_insider_transactions",
         ]
+    },
+    "macro_data": {
+        "description": "Macroeconomic indicators (rates, inflation, labor, growth)",
+        "tools": [
+            "get_macro_indicators",
+        ]
     }
 }
 
 VENDOR_LIST = [
     "yfinance",
+    "fred",
     "alpha_vantage",
 ]
 
@@ -111,6 +119,10 @@ VENDOR_METHODS = {
         "alpha_vantage": get_alpha_vantage_insider_transactions,
         "yfinance": get_yfinance_insider_transactions,
     },
+    # macro_data
+    "get_macro_indicators": {
+        "fred": get_fred_macro_data,
+    },
 }
 
 def get_category_for_method(method: str) -> str: