[C# 15-Fundamentals]: New Feature - Closed hierarchies
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:checkered_flag: Release: .NET 11
:pushpin: seQUESTered
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Description
### .NET 11 Preview
.NET 11 Preview 5
### Link to speclet
- [Speclet](https://github.com/dotnet/csharplang/blob/main/proposals/closed-hierarchies.md)
### Link to Pull request
- [PR](https://github.com/dotnet/roslyn/pull/83736)
### New behavior
To quickly follow the .NET 11 release add fundamentals coverage for closed hierarchies.
In addition, compare with unions and the work in #52320
### Language reference tasks
Should be covered before this issue.
### Everyday C# tasks
- Update pattern matching articles on this.
- Update class and type system discussions.
- Update records and types discussions.
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[Associated WorkItem - 582356](https://dev.azure.com/msft-skilling/Content/_workitems/edit/582356)
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