refactor: Rename breakEvenTriggerPercent to profitLockAfterTP1Percent for clarity

- Renamed config variable to accurately reflect behavior (locks profit, not breakeven)
- Updated log messages to say 'lock +X% profit' instead of misleading 'breakeven'
- Maintains backwards compatibility (accepts old BREAKEVEN_TRIGGER_PERCENT env var)
- Updated .env with new variable name and explanatory comment

Why: Config was named 'breakeven' but actually locks profit at entry ± X%
For SHORT at $141.51 with 0.3% lock: SL moves to $141.08 (not breakeven $141.51)
This protects remaining runner position after TP1 by allowing small profit giveback

Files changed:
- config/trading.ts: Interface + default + env parsing
- lib/trading/position-manager.ts: Usage + log message
- .env: Variable rename with migration comment

.env

@@ -129,7 +129,7 @@ EMERGENCY_STOP_PERCENT=-2
 
 # Dynamic stop-loss adjustments
 # Move SL to breakeven when profit reaches this level
-BREAKEVEN_TRIGGER_PERCENT=0.3
+PROFIT_LOCK_AFTER_TP1_PERCENT=0.3  # Lock this % profit on remaining position after TP1 (was BREAKEVEN_TRIGGER_PERCENT)
 
 # Lock in profit when price reaches this level
 PROFIT_LOCK_TRIGGER_PERCENT=1

config/trading.ts

@@ -40,7 +40,7 @@ export interface TradingConfig {
   hardStopPercent: number // Hard stop trigger (e.g., -2.5)
   
   // Dynamic adjustments
-  breakEvenTriggerPercent: number // When to move SL to breakeven
+  profitLockAfterTP1Percent: number // Lock this % profit on remaining position after TP1
   profitLockTriggerPercent: number // When to lock in profit
   profitLockPercent: number // How much profit to lock
   
@@ -132,7 +132,7 @@ export const DEFAULT_TRADING_CONFIG: TradingConfig = {
   hardStopPercent: -2.5, // Hard stop (TRIGGER_MARKET)
   
   // Dynamic adjustments
-  breakEvenTriggerPercent: 0.4, // Move SL to this profit level after TP1 hits
+  profitLockAfterTP1Percent: 0.4, // Lock this % profit on remaining position after TP1
   profitLockTriggerPercent: 1.0, // Lock profit at +1.0%
   profitLockPercent: 0.4, // Lock +0.4% profit
   
@@ -482,8 +482,8 @@ export function getConfigFromEnv(): Partial<TradingConfig> {
       ? parseFloat(process.env.MAX_TP2_PERCENT)
       : undefined,
       
-    breakEvenTriggerPercent: process.env.BREAKEVEN_TRIGGER_PERCENT
-      ? parseFloat(process.env.BREAKEVEN_TRIGGER_PERCENT)
+    profitLockAfterTP1Percent: process.env.PROFIT_LOCK_AFTER_TP1_PERCENT || process.env.BREAKEVEN_TRIGGER_PERCENT
+      ? parseFloat(process.env.PROFIT_LOCK_AFTER_TP1_PERCENT || process.env.BREAKEVEN_TRIGGER_PERCENT!)
       : undefined,
     profitLockTriggerPercent: process.env.PROFIT_LOCK_TRIGGER_PERCENT
       ? parseFloat(process.env.PROFIT_LOCK_TRIGGER_PERCENT)

lib/trading/position-manager.ts

@@ -708,13 +708,13 @@ export class PositionManager {
       trade.currentSize = trade.positionSize * ((100 - this.config.takeProfit1SizePercent) / 100)
       const newStopLossPrice = this.calculatePrice(
         trade.entryPrice,
-        this.config.breakEvenTriggerPercent, // Use configured breakeven level
+        this.config.profitLockAfterTP1Percent, // Lock profit on remaining position
         trade.direction
       )
       trade.stopLossPrice = newStopLossPrice
       trade.slMovedToBreakeven = true
       
-      console.log(`🔒 SL moved to +${this.config.breakEvenTriggerPercent}% (${this.config.takeProfit1SizePercent}% closed, ${100 - this.config.takeProfit1SizePercent}% remaining): ${newStopLossPrice.toFixed(4)}`)
+      console.log(`🔒 SL moved to lock +${this.config.profitLockAfterTP1Percent}% profit (${this.config.takeProfit1SizePercent}% closed, ${100 - this.config.takeProfit1SizePercent}% remaining): ${newStopLossPrice.toFixed(4)}`)
       
       // CRITICAL: Cancel old on-chain SL orders and place new ones at updated price
       // BUT: Only if this is the ONLY active trade on this symbol