feat: enforce profit-only spot exits

.env.example

@@ -93,9 +93,14 @@ TIME_SERIES_REQUIRE_FRESH_MODEL=true
 TIME_SERIES_MODEL_MAX_AGE_HOURS=48
 MARKET_TICKER_MAX_AGE_SECONDS=45
 STOP_LOSS_PERCENT=0.04
+STOP_LOSS_EXIT_ENABLED=false
 TAKE_PROFIT_PERCENT=0.035
 TRAILING_STOP_PERCENT=0.015
 MIN_HOLD_SECONDS=180
+# Ordinary RSI/EMA/model/exposure exits are only executed when the estimated
+# result after entry fee, exit fee, spread and slippage clears this net margin.
+PROFIT_ONLY_EXIT_ENABLED=true
+MIN_EXIT_NET_PERCENT=0.31
 ENTRY_COOLDOWN_SECONDS=180
 MAX_DAILY_DRAWDOWN_USDT=6
 MIN_CASH_RESERVE_USDT=5