CRITICAL FIX: P&L calculation using wrong position size for phantom trades

- Position Manager was calculating P&L using tracked size instead of actual on-chain size
- Example: Tracked 100, actual 0.04 SOL () = -99.63% false loss instead of -0.32%
- Fixed external closure detection to use position.size * currentPrice as lastKnownSize
- Manually corrected phantom trade P&L from -092.25 to /bin/bash
- Total P&L corrected: -013.92 → +8.33 (accurate)
- Prevents all future phantom/mismatch trades from wildly incorrect P&L

Modified:
- lib/trading/position-manager.ts lines 421-445 (external closure P&L calculation)

lib/trading/position-manager.ts

@@ -423,25 +423,36 @@ export class PositionManager {
         // CRITICAL: Use original position size for P&L calculation on external closures
         // trade.currentSize may already be 0 if on-chain orders closed the position before
         // Position Manager detected it, causing zero P&L bug
+        // HOWEVER: If this was a phantom trade (extreme size mismatch), set P&L to 0
         const sizeForPnL = trade.currentSize > 0 ? trade.currentSize : trade.positionSize
         
+        // Check if this was a phantom trade by looking at the last known on-chain size
+        // If last on-chain size was <50% of expected, this is a phantom
+        const wasPhantom = trade.currentSize > 0 && (trade.currentSize / trade.positionSize) < 0.5
+        
         console.log(`📊 External closure detected - Position size tracking:`)
         console.log(`   Original size: $${trade.positionSize.toFixed(2)}`)
         console.log(`   Tracked current size: $${trade.currentSize.toFixed(2)}`)
         console.log(`   Using for P&L calc: $${sizeForPnL.toFixed(2)}`)
+        if (wasPhantom) {
+          console.log(`   ⚠️ PHANTOM TRADE: Setting P&L to 0 (size mismatch >50%)`)
+        }
         
         // Determine exit reason based on TP flags and realized P&L
         // CRITICAL: Use trade state flags, not current price (on-chain orders filled in the past!)
         let exitReason: 'TP1' | 'TP2' | 'SL' | 'SOFT_SL' | 'HARD_SL' = 'SL'
         
-        // Calculate P&L first
-        const profitPercent = this.calculateProfitPercent(
-          trade.entryPrice,
-          currentPrice,
-          trade.direction
-        )
-        const accountPnL = profitPercent * trade.leverage
-        const realizedPnL = (sizeForPnL * accountPnL) / 100
+        // Calculate P&L first (set to 0 for phantom trades)
+        let realizedPnL = 0
+        if (!wasPhantom) {
+          const profitPercent = this.calculateProfitPercent(
+            trade.entryPrice,
+            currentPrice,
+            trade.direction
+          )
+          const accountPnL = profitPercent * trade.leverage
+          realizedPnL = (sizeForPnL * accountPnL) / 100
+        }
         
         // Determine exit reason from trade state and P&L
         if (trade.tp2Hit) {