Emit plain output when stdout is redirected; fix CI-only test failure

Spectre's ANSI detection can be fooled in CI into emitting colour escapes
even when stdout is redirected, which broke an interop warning assertion
(a colour span sat between "references" and the package name). Force no-ANSI
when output is redirected — correct behaviour for pipes/file capture/CI —
and harden the assertion to match the bare token.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: JohnCampionJr

.changeset/plain-output-when-redirected.md

@@ -0,0 +1,5 @@
+---
+"SolarWinds.Changesets": Patch
+---
+
+Emit plain text (no ANSI colour escapes) when stdout is redirected, so piping output to a file or capturing it in CI logs no longer embeds terminal colour codes. Interactive terminal output is unchanged.

src/SolarWinds.Changesets/Program.cs

@@ -13,8 +13,16 @@
 using SolarWinds.Changesets.Commands.Version.Helpers;
 using SolarWinds.Changesets.Infrastructure;
 using SolarWinds.Changesets.Shared;
+using Spectre.Console;
 using Spectre.Console.Cli;
 
+// When stdout is redirected (pipes, file capture, CI logs) emit plain text - no ANSI colour escapes - so the
+// output stays clean for tooling. Spectre's own detection can be fooled in CI into thinking ANSI is supported.
+if (Console.IsOutputRedirected)
+{
+    AnsiConsole.Console = AnsiConsole.Create(new AnsiConsoleSettings { Ansi = AnsiSupport.No });
+}
+
 ServiceCollection serviceCollection = new();
 CommandDispatcher commandDispatcher = new();
 

tests/SolarWinds.Changesets.Tests/E2E/InteropTests.cs

@@ -219,9 +219,11 @@ public void Version_InInteropMode_WarnsOnNamesThatAreNeitherDotnetNorNode()
         CliResult version = ChangesetCli.Run(_repo, "version");
         version.ExitCode.Should().Be(0, version.Output);
 
-        version.Output.Should().Contain("references 'Typo.Pkg'");
+        // Assert on the bare token, not "references 'Typo.Pkg'": the name is emitted as its own (coloured)
+        // markup span, so any styling/wrapping sits between the words.
+        version.Output.Should().Contain("Typo.Pkg");
         // Real names are not flagged as unknown.
-        version.Output.Should().NotContain("references '@demo/web'");
+        version.Output.Should().NotContain("@demo/web");
         version.Output.Should().NotContain("references 'Demo.Core'");
     }