[alexanderlinne]

Namespace has derived from Slice since the initial import, but uses almost nothing from it: the loader creates it with an empty list and fills Types by casting it back, and ArchBuilder only reads Types. The inheritance also gave it Identifier, NameSpace, CountOfAsteriskInPattern and ContainsNamespace(), which mean nothing for a namespace, and tied its Name and FullName to how slices describe themselves.

Namespace is now a class of its own that implements IHasName, IHasDescription and IHasDependencies. Name, FullName, Description, Types, Classes, Interfaces, Dependencies, BackwardsDependencies and equality by full name are unchanged. The loader adds types through an internal AddType instead of the cast.

The namespace parts of PlantUmlFileBuilder.WithDependenciesFrom(slices) move into a new overload WithDependenciesFrom(IEnumerable), so WithDependenciesFrom(Architecture.Namespaces) keeps compiling and drawing the same diagram. The slice overload and focus mode lose their "slice is Namespace" branches; the comment there already said that namespaces and slices can't be mixed in one diagram.

Both overloads choose dependency targets and drop nodes without dependencies through the same generic helpers. The node removal now collects the nodes before removing them, as removing entries while enumerating a dictionary throws on .NET Framework.

A snapshot of a namespace diagram, recorded before the change, pins the output, and a test pins namespace equality.

Breaking changes:

• Namespace no longer derives from Slice. Code that used a Namespace as a Slice, or used Identifier, NameSpace, CountOfAsteriskInPattern or ContainsNamespace() on it, no longer compiles.
• Namespaces can no longer be passed to the slice overload of WithDependenciesFrom or to WithDependenciesFromFocusOn.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.12121% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.53%. Comparing base (f439e0d) to head (bf4efd7).

Files with missing lines	Patch %	Lines
ArchUnitNET/Domain/Namespace.cs	66.66%	7 Missing and 4 partials ⚠️
...tNET/Domain/PlantUml/Export/PlantUmlFileBuilder.cs	93.87%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #512      +/-   ##
==========================================
- Coverage   86.55%   86.53%   -0.02%     
==========================================
  Files         261      261              
  Lines       12648    12713      +65     
  Branches     1236     1241       +5     
==========================================
+ Hits        10947    11001      +54     
- Misses       1359     1366       +7     
- Partials      342      346       +4     

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