fix(launcher): harden Campaign LA11 gate evidence

tests/AcDream.Launcher.Core.Tests.Fixtures.InstallLeaseHolder/Program.cs

@@ -31,7 +31,7 @@ if (!string.IsNullOrWhiteSpace(selfUpdateData)
     SelfUpdateStartupResult startup = await LauncherSelfUpdateBootstrap.HandleAsync(
         effectiveArgs,
         manager,
-        Path.GetFullPath(selfUpdateTarget),
+        Path.GetFullPath(AppContext.BaseDirectory),
         Path.GetFullPath(
             Environment.ProcessPath
             ?? throw new InvalidOperationException("Process path is unavailable.")));
@@ -53,6 +53,8 @@ return effectiveArgs.FirstOrDefault() switch
     "stage-self-update" => await StageSelfUpdateAsync(effectiveArgs[1..]),
     "bootstrap-probe" => await BootstrapProbeAsync(effectiveArgs[1..]),
     "canonical-probe" => CanonicalProbe(effectiveArgs[1..]),
+    "hold-campaign-la-process" =>
+        await HoldCampaignLaProcessAsync(effectiveArgs[1..]),
     _ => 2,
 };
 
@@ -60,7 +62,7 @@ static bool IsBootstrapInvocation(string[] arguments) =>
     arguments.Length > 0
     && arguments[0] is LauncherSelfUpdateBootstrap.HelperArgument
         or LauncherSelfUpdateBootstrap.ConfirmArgument
-        or LauncherSelfUpdateBootstrap.DeferredArgument
+        or "--acdream-self-update-deferred-v1"
         or "canonical-probe";
 
 static ApplicationPathSet Paths(string dataDirectory)
@@ -180,6 +182,34 @@ static int CanonicalProbe(string[] arguments)
     return 0;
 }
 
+static async Task<int> HoldCampaignLaProcessAsync(string[] arguments)
+{
+    if (arguments.Length != 4
+        || arguments[0] is not ("--config" or "--session-config"))
+    {
+        return 2;
+    }
+
+    string configPath = Path.GetFullPath(arguments[1]);
+    string readyPath = Path.GetFullPath(arguments[2]);
+    string releasePath = Path.GetFullPath(arguments[3]);
+    if (!File.Exists(configPath))
+    {
+        return 3;
+    }
+
+    File.WriteAllText(
+        readyPath,
+        Environment.ProcessId.ToString(
+            System.Globalization.CultureInfo.InvariantCulture));
+    while (!File.Exists(releasePath))
+    {
+        await Task.Delay(10);
+    }
+
+    return 0;
+}
+
 static async Task<int> HoldUpdateLeaseAsync(string[] arguments)
 {
     if (arguments.Length != 4