Merge main into vectors (structural reconciliation)

Reconcile vectors with main's parallel evolution. Resolution rules:

- Quantities: take vectors. dimensions.json + source generator is the
  intended end state; main's per-domain folder reorg of soon-to-be-deleted
  hand-written types is dropped (110 conflicts).
- Path types: take main's flat layout (Semantics.Paths/{Implementations,
  Interfaces,Primitives}/...) instead of vectors' doubled
  Semantics.Paths/Paths/... (~50 conflicts via rename/rename).
- Path utility: take main's conditional-compilation PathPolyfill pattern;
  drop vectors' PathHelper duplicate (Utilities/NetStandard20Polyfills.cs).
- Validation: take vectors' attribute-per-file reorganisation under
  Semantics.Strings/Validation/Attributes/{Casing,Format,FirstClassTypes,
  Text}/ and Semantics.Paths/Validation/Attributes/Path/.
- scripts/: take vectors' deletion (build moved to ktsu MSBuild SDKs).
- Tests: take vectors where it adds coverage; take main where it improved
  assertion messages (PathUtilityTests).
- Solution: take vectors (only it includes Semantics.SourceGenerators).
- csproj files: take vectors (reflect new package layout, including
  InternalsVisibleTo and Microsoft.Bcl.AsyncInterfaces conditional refs).
- Directory.Packages.props: merge — keep vectors' source-generator deps
  (CodeBlocker, Microsoft.CodeAnalysis.*, System.Text.Json, PreciseNumber,
  Microsoft.Bcl.AsyncInterfaces) plus main's bumped versions
  (Polyfill 10.5.0) and added packages (ktsu.RoundTripStringJsonConverter).
- global.json: take main's MSTest.Sdk 4.2.2.

This is pass 1 of the two-pass reconciliation. Pass 2 audits the
substantive main commits (RoundTripStringJsonConverter integration,
Ensure.NotNull replacement of Guard, DirectoryName type, .NET 10 / SDK
adjustments) to ensure their content is applied where the resolution
rules took vectors' file.

Author: claude

.gitignore

@@ -644,4 +644,10 @@ Temporary Items
 /.what-is-this.md
 # SpecStory derived-cursor-rules.mdc backup files
 /ai_rules_backups/*
-.specstory/ai_rules_backups/*
+.specstory/ai_rules_backups/*
+
+# Claude.ai local settings
+.claude/settings.local.json
+
+# ImGui.ini files
+imgui.ini

CHANGELOG.md

@@ -1 +1 @@
-Copyright (c) 2023-2025 ktsu-dev
+Copyright (c) 2023-2026 ktsu-dev contributors

COPYRIGHT.md

@@ -8,13 +8,13 @@
     <!-- Test packages -->
     <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.3.2" />
     <PackageVersion Include="Microsoft.Testing.Extensions.TrxReport" Version="2.0.2" />
-    <!-- Semantics project packages -->
-    <!-- Strings has no external validation dependency - uses native ValidationAdapter -->
+    <!-- Semantics runtime packages -->
     <PackageVersion Include="ktsu.PreciseNumber" Version="1.7.5" />
-    <PackageVersion Include="Polyfill" Version="9.8.1" />
+    <PackageVersion Include="ktsu.RoundTripStringJsonConverter" Version="1.0.10" />
+    <PackageVersion Include="Polyfill" Version="10.5.0" />
     <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="9.0.3" />
     <PackageVersion Include="System.Memory" Version="4.6.3" />
-    <!-- SourceGenerators project packages -->
+    <!-- Source generator packages -->
     <PackageVersion Include="ktsu.CodeBlocker" Version="1.2.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />

Directory.Packages.props

@@ -1,3 +1,19 @@
-## v1.0.20-pre.1 (prerelease)
+## v1.0.35 (patch)
+
+Changes since v1.0.34:
+
+- Bump Polyfill from 10.4.0 to 10.5.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 10.3.0 to 10.4.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump MSTest.Sdk from 4.2.1 to 4.2.2 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 10.1.1 to 10.3.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 10.0.0 to 10.1.1 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump MSTest.Sdk from 4.1.0 to 4.2.1 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 9.24.0 to 10.0.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 9.23.0 to 9.24.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 9.22.0 to 9.23.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 9.18.0 to 9.22.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 9.17.0 to 9.18.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 9.16.0 to 9.17.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 9.13.0 to 9.16.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
+- Bump Polyfill from 9.12.0 to 9.13.0 ([@dependabot[bot]](https://github.com/dependabot[bot]))
 
-Changes since v1.0.20-pre.1:

LATEST_CHANGELOG.md

@@ -2,7 +2,7 @@ MIT License
 
 https://github.com/ktsu-dev/Semantics
 
-Copyright (c) 2023-2025 ktsu-dev
+Copyright (c) 2023-2026 ktsu-dev contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -20,4 +20,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+SOFTWARE.

LICENSE.md

@@ -0,0 +1,7 @@
+// Copyright (c) ktsu.dev
+// All rights reserved.
+// Licensed under the MIT license.
+
+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("ktsu.Semantics.Test")]