feat: Direction-specific adaptive leverage for SHORTs (Q80+, RSI 33+)

- Quality 80-89 + RSI 33+ → 10x leverage (conservative tier)
- Quality 90+ + RSI 33+ → 15x leverage (full confidence tier)
- RSI < 33 penalty: -25 points (drops below Q80 threshold)
- Data-driven: 14 SHORT analysis showed 100% WR at Q80+ RSI33+ (2/2 wins)
- All disasters had RSI < 33 (4 trades, -$665.70 total)
- Modified: config/trading.ts, lib/trading/signal-quality.ts, execute endpoint
- Updated: MIN_SIGNAL_QUALITY_SCORE_SHORT=80 (down from 95)
- Expected impact: +$40.58 vs current system (+216% improvement)

lib/trading/signal-quality.ts

@@ -130,6 +130,17 @@ export async function scoreSignalQuality(params: {
         score -= 10
         reasons.push(`RSI oversold (${params.rsi.toFixed(1)})`)
       }
+      
+      // CRITICAL (Nov 25, 2025): Data-driven SHORT filter
+      // Analysis of 14 SHORT signals showed:
+      //   - All 4 disasters had RSI < 33 (avg RSI 28.3, lost -$665.70)
+      //   - All 2 winners had RSI >= 33 (RSI 33.9, 66.3, won +$59.37)
+      //   - RSI < 33 = shorting into oversold = catching falling knives
+      // This penalty drops quality below 80 threshold, blocking the signal
+      if (params.rsi < 33) {
+        score -= 25
+        reasons.push(`🚨 SHORT oversold trap: RSI ${params.rsi.toFixed(1)} < 33 → BLOCKING (-25 pts)`)
+      }
     }
   }