Tracks the "JSON stack" open item in PLAN.md §5.

Tasks

• Audit whether the v2 code still references Newtonsoft.Json (the dead Serializers.cs using TypeNameHandling.All was already removed in Updates OCGV and SHOT to Terminal.Gui v2 PowerShell/ConsoleGuiTools#267).
• If present, migrate remaining usage to System.Text.Json.
• Drop the Newtonsoft.Json package reference from Directory.Packages.props and project files.

Legacy-cruft cleanup; pairs with the de-Microsoft rebrand.