feat(polymarket): widen market filter for more uncertainty-zone markets

- min_volume: 1000 → 500 USDC (surface lower-liquidity but real markets)
- max_days_to_resolution: 30 → 60 days (more markets with unresolved uncertainty)
- Tech keywords: +tesla, +elon, +nuclear, +quantum, +chip
- Macro keywords: +recession, +gdp, +unemployment, +trade war, +trade deal
  (inflation/tariff already present)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bot/data/polymarket.py

@@ -66,6 +66,7 @@ class PolymarketClient:
         "nasdaq", "sp500", "s&p 500", "s&p500",
         "federal reserve", "fed rate", "interest rate",
         "inflation", "tariff", "treasury yield",
+        "recession", " gdp ", "unemployment", "trade war", "trade deal",
         " ipo ", "sec ", "cftc",
     ]
 
@@ -77,6 +78,7 @@ class PolymarketClient:
     _TECH_KEYWORDS: list[str] = [
         " ai ", "openai", "apple", "google", "microsoft", "meta",
         "nvidia", "regulation", "antitrust",
+        "tesla", "elon", "nuclear", "quantum", "chip",
     ]
 
     _EVENTS_KEYWORDS: list[str] = [
@@ -118,10 +120,10 @@ class PolymarketClient:
 
     async def get_active_markets(
         self,
-        min_volume: float = 1000,
+        min_volume: float = 500,
         pages: int = 3,
         page_size: int = 200,
-        max_days_to_resolution: int = 30,
+        max_days_to_resolution: int = 60,
     ) -> list[Market]:
         """Fetch active markets from Gamma API (no auth needed).