feat(cli): scadalink audit verify-chain subcommand v1 no-op (#23 M8)

tests/ScadaLink.CLI.Tests/Commands/AuditCommandTestHarness.cs

@@ -25,15 +25,38 @@ internal static class AuditCommandTestHarness
         return root;
     }
 
+    /// <summary>
+    /// Parses and invokes the command tree, capturing output from both channels the CLI
+    /// uses: System.CommandLine's parser diagnostics flow through the
+    /// <see cref="InvocationConfiguration"/> writers, while command actions write through
+    /// <see cref="Console"/> (consistent with the rest of the CLI). Both are merged into
+    /// the returned <c>Out</c>/<c>Err</c> strings. Callers must be in the <c>Console</c>
+    /// xUnit collection so the global <see cref="Console"/> redirect is not racy.
+    /// </summary>
     public static (int Exit, string Out, string Err) Invoke(RootCommand root, params string[] args)
     {
         var output = new StringWriter();
         var error = new StringWriter();
-        var exit = root.Parse(args).Invoke(new InvocationConfiguration
+
+        var originalOut = Console.Out;
+        var originalErr = Console.Error;
+        Console.SetOut(output);
+        Console.SetError(error);
+        int exit;
+        try
         {
-            Output = output,
-            Error = error,
-        });
+            exit = root.Parse(args).Invoke(new InvocationConfiguration
+            {
+                Output = output,
+                Error = error,
+            });
+        }
+        finally
+        {
+            Console.SetOut(originalOut);
+            Console.SetError(originalErr);
+        }
+
         return (exit, output.ToString(), error.ToString());
     }
 }