fix(cli): resolve CLI-002..007 — robust response rendering, URL/JSON arg validation, credential env-vars, doc refresh

tests/ScadaLink.CLI.Tests/TestCollections.cs

@@ -0,0 +1,16 @@
+namespace ScadaLink.CLI.Tests;
+
+/// <summary>
+/// xUnit runs test classes in parallel by default. Several CLI test classes redirect
+/// the process-global <see cref="System.Console.Out"/> / <see cref="System.Console.Error"/>,
+/// which races when they run concurrently. Tests in this collection run serially.
+/// </summary>
+[CollectionDefinition("Console")]
+public sealed class ConsoleCollection { }
+
+/// <summary>
+/// Test classes that mutate process-global environment variables run serially so they
+/// do not observe each other's changes.
+/// </summary>
+[CollectionDefinition("Environment")]
+public sealed class EnvironmentCollection { }