fix(headless): complete connected movement gate

src/AcDream.Headless/HeadlessEntryPoint.cs

@@ -14,7 +14,7 @@ internal static class HeadlessEntryPoint
         Usage:
           acdream-headless --help
           acdream-headless validate --config <path> [path overrides]
-          acdream-headless run --config <path> [path overrides]
+          acdream-headless run --config <path> [path overrides] [credentials]
 
         Commands:
           validate   Validate a versioned headless configuration without connecting.
@@ -25,7 +25,9 @@ internal static class HeadlessEntryPoint
           --data-dir <path>
           --cache-dir <path>
 
-        Secrets are never accepted on the command line.
+        Direct single-session credentials:
+          -user <account> -password <password>
+          --user <account> --password <password>
         """;
 
     internal static int Run(
@@ -76,7 +78,9 @@ internal static class HeadlessEntryPoint
                     configuration,
                     paths,
                     standardInput,
-                    output);
+                    output,
+                    directCredentials:
+                        commandLine.DirectCredentials);
                 return (int)host.RunAsync(cancellationToken)
                     .GetAwaiter()
                     .GetResult();