feat: Phase 7.2 Real-Time Quality Validation

FEATURE: Validate signal quality before Smart Entry execution
- Re-checks market conditions after pullback wait (2-4 min)
- Cancels trade if conditions degraded significantly

VALIDATION CHECKS (4):
1. ADX degradation: Cancel if drops >2 points (enhanced existing)
2. Volume collapse: Cancel if drops >40% (NEW - momentum fading)
3. RSI reversal: Cancel if LONG RSI <30 or SHORT RSI >70 (NEW)
4. MAGAP divergence: Cancel if wrong MA structure (NEW)

EXPECTED IMPACT:
- Block 5-10% of signals that degrade during Smart Entry wait
- Save $300-800 in prevented losses over 100 trades
- Prevent entries when ADX/volume/momentum weakens

FILES CHANGED:
- lib/trading/smart-entry-timer.ts (115 lines validation logic)
- lib/trading/market-data-cache.ts (added maGap to interface)

INTEGRATION: Works with Phase 7.1 Smart Entry Timer
- Smart Entry waits for pullback (2-4 min)
- Phase 7.2 validates quality before execution
- Cancels if conditions degraded, executes if maintained

lib/trading/market-data-cache.ts

@@ -14,6 +14,7 @@ export interface MarketMetrics {
   rsi: number            // Relative Strength Index (momentum)
   volumeRatio: number    // Current volume / average volume
   pricePosition: number  // Position in recent range (0-100%)
+  maGap?: number         // MA50-MA200 gap percentage (v9+)
   currentPrice: number   // Latest close price
   timestamp: number      // Unix timestamp (ms)
   timeframe: string      // "5" for 5min, "60" for 1h, etc.