Full test suite can leak ThrowingTextWriter into unrelated tests

[Widthdom]

Summary

While attempting the full suite, multiple tests failed with:

ObjectDisposedException: Cannot access a disposed object.
Object name: 'ThrowingTextWriter'

The command used was:

dotnet test CodeIndex.sln -c Release -p:UseSharedCompilation=false --no-build

This appears to be existing Console state pollution: after a test installs/disposes ThrowingTextWriter, unrelated tests that write to Console can fail under parallel execution.

Expected

Console redirection tests should restore global state in a way that cannot leak into unrelated tests, or the affected tests should be isolated from parallel execution.

[Widthdom]

Closing: current origin/main includes the process-global test isolation fix, and this was observed on an older base while validating this branch.