Fix P&L calculation and update Copilot instructions

- Fix P&L calculation in Position Manager to use actual entry vs exit price instead of SDK's potentially incorrect realizedPnL
- Calculate actual profit percentage and apply to closed position size for accurate dollar amounts
- Update database record for last trade from incorrect 6.58 to actual .66 P&L
- Update .github/copilot-instructions.md to reflect TP2-as-runner system changes
- Document 25% runner system (5x larger than old 5%) with ATR-based trailing
- Add critical P&L calculation pattern to common pitfalls section
- Mark Phase 5 complete in development roadmap

lib/trading/position-manager.ts

@@ -795,9 +795,13 @@ export class PositionManager {
       const wasForcedFullClose = !!result.fullyClosed && percentToClose < 100
       const treatAsFullClose = percentToClose >= 100 || result.fullyClosed
 
+      // Calculate actual P&L based on entry vs exit price
+      const profitPercent = this.calculateProfitPercent(trade.entryPrice, closePriceForCalc, trade.direction)
+      const actualRealizedPnL = (closedUSD * profitPercent) / 100
+
       // Update trade state
       if (treatAsFullClose) {
-        trade.realizedPnL += result.realizedPnL || 0
+        trade.realizedPnL += actualRealizedPnL
         trade.currentSize = 0
         trade.trailingStopActive = false
 
@@ -837,12 +841,13 @@ export class PositionManager {
           : '✅ Position closed'
         console.log(`${closeLabel} | P&L: $${trade.realizedPnL.toFixed(2)} | Reason: ${reason}`)
       } else {
-        // Partial close (TP1)
-        trade.realizedPnL += result.realizedPnL || 0
+        // Partial close (TP1) - calculate P&L for partial amount
+        const partialRealizedPnL = (closedUSD * profitPercent) / 100
+        trade.realizedPnL += partialRealizedPnL
         trade.currentSize = Math.max(0, trade.currentSize - closedUSD)
 
         console.log(
-          `✅ Partial close executed | Realized: $${(result.realizedPnL || 0).toFixed(2)} | Closed (base): ${closedSizeBase.toFixed(6)} | Closed (USD): $${closedUSD.toFixed(2)} | Remaining USD: $${trade.currentSize.toFixed(2)}`
+          `✅ Partial close executed | Realized: $${partialRealizedPnL.toFixed(2)} | Closed (base): ${closedSizeBase.toFixed(6)} | Closed (USD): $${closedUSD.toFixed(2)} | Remaining USD: $${trade.currentSize.toFixed(2)}`
         )
       }