Make TP2 the runner - no more partial closes

CHANGE: TP2 now activates trailing stop on full 25% remaining instead
of closing 80% and leaving 5% runner.

Benefits:
- 5x larger runner (25% vs 5%) = 25 vs 05 on 100 position
- Eliminates Drift minimum size issues completely
- Simplifies logic - no more canUseRunner() viability checks
- Better R:R on extended moves

New flow:
- TP1 (+0.4%): Close 75%, keep 25%
- TP2 (+0.7%): Skip close, activate trailing stop on full 25%
- Runner: 25% with ATR-based trailing (0.25-0.9%)

Config change: takeProfit2SizePercent: 80 → 0
Position Manager: Remove canUseRunner logic, activate trailing at TP2 hit

lib/trading/position-manager.ts

@@ -9,7 +9,6 @@ import { closePosition } from '../drift/orders'
 import { getPythPriceMonitor, PriceUpdate } from '../pyth/price-monitor'
 import { getMergedConfig, TradingConfig, getMarketConfig } from '../../config/trading'
 import { updateTradeExit, updateTradeState, getOpenTrades } from '../database/trades'
-import { canUseRunner, getViableTP2Percent } from './runner-calculator'
 
 export interface ActiveTrade {
   id: string
@@ -704,61 +703,24 @@ export class PositionManager {
       await this.saveTradeState(trade)
     }
 
-    // 5. Take profit 2 (remaining position)
+    // 5. TP2 Hit - Activate runner (no close, just start trailing)
     if (trade.tp1Hit && !trade.tp2Hit && this.shouldTakeProfit2(currentPrice, trade)) {
-      console.log(`🎊 TP2 HIT: ${trade.symbol} at ${profitPercent.toFixed(2)}%`)
+      console.log(`🎊 TP2 HIT: ${trade.symbol} at ${profitPercent.toFixed(2)}% - Activating 25% runner!`)
       
-      // Check if runner would be viable with current position size
-      const runnerCheck = canUseRunner(
-        trade.symbol,
-        trade.currentSize,
-        currentPrice,
-        this.config.takeProfit1SizePercent,
-        this.config.takeProfit2SizePercent
+      // Mark TP2 as hit and activate trailing stop on full remaining 25%
+      trade.tp2Hit = true
+      trade.peakPrice = currentPrice
+      trade.runnerTrailingPercent = this.getRunnerTrailingPercent(trade)
+      
+      console.log(
+        `🏃 Runner activated on full remaining position: ${((trade.currentSize / trade.positionSize) * 100).toFixed(1)}% | trailing buffer ${trade.runnerTrailingPercent?.toFixed(3)}%`
       )
       
-      if (!runnerCheck.viable) {
-        console.log(`⚠️ Runner not viable: ${runnerCheck.reason}`)
-        console.log(`   Skipping TP2 close, will use trailing stop on full 25% remaining`)
-        
-        // Mark TP2 as "hit" but don't close anything - activate trailing on full 25%
-        trade.tp2Hit = true
-        trade.trailingStopActive = true
-        trade.runnerTrailingPercent = this.getRunnerTrailingPercent(trade)
-        
-        console.log(
-          `🏃 Runner activated on full remaining position: ${((trade.currentSize / trade.positionSize) * 100).toFixed(1)}% | trailing buffer ${trade.runnerTrailingPercent?.toFixed(3)}%`
-        )
-        
-        await this.saveTradeState(trade)
-        return
-      }
-      
-      // Runner is viable - proceed with TP2 close
-      const percentToClose = this.config.takeProfit2SizePercent
-      
-      console.log(`✅ Runner viable: ${runnerCheck.runnerSizeBase.toFixed(4)} base (${runnerCheck.runnerSizeUSD.toFixed(2)} USD)`)
-      
-      await this.executeExit(trade, percentToClose, 'TP2', currentPrice)
-      
-      // If some position remains, mark TP2 as hit and activate trailing stop
-      if (percentToClose < 100) {
-        trade.tp2Hit = true
-        trade.currentSize = trade.currentSize * ((100 - percentToClose) / 100)
-        trade.runnerTrailingPercent = this.getRunnerTrailingPercent(trade)
-        
-        console.log(
-          `🏃 Runner activated: ${((trade.currentSize / trade.positionSize) * 100).toFixed(1)}% remaining | trailing buffer ${trade.runnerTrailingPercent?.toFixed(3)}%`
-        )
-        
-        // Save state after TP2
-        await this.saveTradeState(trade)
-      }
+      // Save state after TP2 activation
+      await this.saveTradeState(trade)
       
       return
-    }
-    
-    // 6. Trailing stop for runner (after TP2)
+    }    // 6. Trailing stop for runner (after TP2 activation)
     if (trade.tp2Hit && this.config.useTrailingStop) {
       // Check if trailing stop should be activated
       if (!trade.trailingStopActive && profitPercent >= this.config.trailingStopActivation) {