Self improve promote sandbox

    private string InvokePromoteSandbox()    {        var paths = RequirePaths();        if (!Directory.Exists(paths.Sandbox))            return "Error: sandbox does not exist.";​        SourceTreeService.CreateBackup(paths);        SourceTreeService.CopyTree(paths.Sandbox, paths.Live, overwriteDestination: true);​        string deployLog = PromoteDeploymentService.DeploySandboxBuildToRunningConsole(paths);        PromoteDeploymentService.SyncLiveSourceToShippedSource(paths);​        string promoteNote = Path.Combine(paths.Root, "last-promote.txt");        File.WriteAllText(promoteNote, $"Promoted at {DateTime.UtcNow:O}\n{deployLog}");​        bool testMode = Environment.GetEnvironmentVariable("LILITH_TESTER") == "1";        if (testMode)        {            return $"PROMOTED — {deployLog} Test runner will restart Lilith into the upgraded build.";        }​        string? runningExe = Environment.ProcessPath            ?? Process.GetCurrentProcess().MainModule?.FileName;        if (string.IsNullOrWhiteSpace(runningExe))            return $"PROMOTED — {deployLog} Restart Lilith manually to run the upgraded build.";​        var startInfo = new ProcessStartInfo(runningExe)        {            UseShellExecute = false,            WorkingDirectory = Path.GetDirectoryName(runningExe)!,        };​        foreach (System.Collections.DictionaryEntry entry in Environment.GetEnvironmentVariables())        {            if (entry.Key is string key && entry.Value is string value)                startInfo.Environment[key] = value;        }​        startInfo.Environment["GENESIS_AFTER_PROMOTE"] = "1";        Process.Start(startInfo);        Environment.Exit(0);        return "PROMOTED — restarting upgraded Lilith.";    }