critical: Fix P&L accumulation for two-stage closes (Bug #85)

- Bug: TP1 profit never accumulated, only TP2 profit recorded
- Impact: Database understated all two-stage trades by TP1 amount
- Example: Actual 7.69 (5.87 TP1 + 1.82 TP2) showed as 5.83
- Fix: Accumulate realizedPnL for ALL closes (partial and full)
- Root Cause: percentToClose >= 100 check excluded TP1 (60%) from P&L update
- File: lib/trading/position-manager.ts line 1916-1920
- Discovered: Dec 15, 2025 - User caught calculation error

lib/trading/position-manager.ts

@@ -1914,10 +1914,15 @@ export class PositionManager {
         return
       }
 
+      // CRITICAL FIX (Dec 15, 2025): Accumulate P&L for BOTH partial and full closes
+      // Bug was: TP1 (60% close) never updated trade.realizedPnL, only TP2 (100% close) did
+      // Result: Database only showed TP2 runner profit, missing TP1 profit
+      trade.realizedPnL += result.realizedPnL || 0
+      logger.log(`💰 P&L accumulated: +$${(result.realizedPnL || 0).toFixed(2)} | Total: $${trade.realizedPnL.toFixed(2)}`)
+      
       // Update trade state
       if (percentToClose >= 100) {
         // Full close - remove from monitoring
-        trade.realizedPnL += result.realizedPnL || 0
         
         // Save to database (only for valid exit reasons)
         if (reason !== 'error') {