Align docs with StyleGuide and add CLAUDE.md

- Rename 16 kebab-case docs to PascalCase per StyleGuide
- Move per-language client design docs from docs/ to clients/<lang>/
  alongside their READMEs
- Add ## Related Documentation sections to 15 docs that lacked one
- Fix sentence-case violations in H3 headings (StyleGuide rule)
- Update cross-references in gateway.md, client READMEs, scripts,
  and generate-proto.ps1 helpers to follow the new paths
- Add CLAUDE.md with build/test commands, the source-update
  verification matrix, the parity-first contract, and pointers
  to MXAccess and Galaxy Repository analysis sources

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

clients/dotnet/README.md

@@ -164,6 +164,19 @@ foreach (GalaxyObject galaxyObject in objects)
 }
 ```
 
+Use `DiscoverHierarchyOptions` to request a server-side slice without pulling
+the full Galaxy:
+
+```csharp
+IReadOnlyList<GalaxyObject> pumps = await repository.DiscoverHierarchyAsync(
+    new DiscoverHierarchyOptions
+    {
+        RootContainedPath = "Area1/Line3",
+        TagNameGlob = "Pump_*",
+        IncludeAttributes = false,
+    });
+```
+
 The CLI exposes the same operations:
 
 ```powershell
@@ -230,5 +243,5 @@ dotnet run --project clients/dotnet/MxGateway.Client.Cli -- smoke --endpoint $en
 ## Related Documentation
 
 - [Client Packaging](../../docs/ClientPackaging.md)
-- [Client Proto Generation](../../docs/client-proto-generation.md)
-- [.NET Client Detailed Design](../../docs/clients-dotnet-csharp-design.md)
+- [Client Proto Generation](../../docs/ClientProtoGeneration.md)
+- [.NET Client Detailed Design](./DotnetClientDesign.md)