Single-trade backtest of an entry, stop and target

Give a direction and three levels — entry, stop, target. The plan is compiled and walked bar by bar (filled at the next open, then exited at stop, target or horizon — no look-ahead), and the run reports the trade: R-multiple, return, and maximum adverse excursion (the deepest unrealised loss it carried before exiting), plus an alert derived from the same plan. Replayed on real price history only. It is one trade on one name, gross of every trading cost — not a hit rate, and not a forecast.