[WotCon] Add the WoT Connectivity registry and its stores

[marcschier]

Adds the WoT Connectivity registry service and stores for Thing Description and Thing Model documents.

This is PR 13 of the stacked split of integration PR #4093 and is stacked on #4140 (marcschier/wot-11-bindings-core). The materialization runtime that consumes this registry follows separately.

The registry has no dependency on the binding runtime or the NodeManager lifecycle; the stacking is only because this change shares the WoT Connectivity server project file with the preceding PRs.

Validation:

• dotnet build src\Opc.Ua.WotCon.Server\Opc.Ua.WotCon.Server.csproj -c Release -f net10.0 -v:m
• dotnet build tests\Opc.Ua.WotCon.Tests\Opc.Ua.WotCon.Tests.csproj -c Release -p:CustomTestTarget=net10.0 -v:m
• dotnet test tests\Opc.Ua.WotCon.Tests\Opc.Ua.WotCon.Tests.csproj -c Release -p:CustomTestTarget=net10.0 --no-build -v:q
• dotnet build src\Opc.Ua.WotCon.Server\Opc.Ua.WotCon.Server.csproj -c Release -v:m

[marcschier]

Fixed the net10.0 solution build failure on this PR.

This branch carries the FluentBuilderGenerator change, which emits calls to
INodeManagerBuilder.VariableFromDataTypeId and to a NodeManagerBuilder constructor
overload carrying the data-type lookup. The runtime side of that API was not present on
any branch in the stack - it had been grouped into a later server PR that does not exist
yet - so every generated node manager failed to compile:

BoilerNodeManager.NodeManager.g.cs(97,31): CS1729: 'NodeManagerBuilder' does not
  contain a constructor that takes 7 arguments
BoilerNodeManager.FluentBuilders.g.cs(140,24): CS1061: 'INodeManagerBuilder' does not
  contain a definition for 'VariableFromDataTypeId'

The fix lands in #4132 (where the generator change belongs) and is cherry-picked here so
this branch builds standalone. It adds VariableFromDataTypeId to the builder interface
and implementation, NodeStateLookupExtensions.FindByDataType, and eight tests covering
the resolution rules.

Verified locally: MinimalBoilerServer - one of the two projects failing in CI - builds
clean on this branch.

[Copilot]

Pull request overview

Adds the WoT Connectivity (WoT-Con) registry surface to Opc.Ua.WotCon.Server, including an injectable registry service model and document stores (in-memory and file-backed via an xRegistry IXRegistryResourceStore abstraction), plus a comprehensive new test suite validating CRUD, labels, persistence, and OPC UA FileType file-handle behavior.

Changes:

• Introduces the registry domain model + bounds/validation helpers (WotRegistryModel, WotRegistryPersistenceBounds, WotLabelValidator) and injectable service/store contracts (IWotRegistryService, IWotRegistryStore).
• Adds document storage implementations, including a content-addressed blob store behind IXRegistryResourceStore (WotBlobResourceStore) and a generalized per-resource FileType manager (WotResourceFileManager).
• Adds extensive NUnit coverage for store contracts, transactional commit outcomes, FileType behavior, labels/ordering, and file-store reload behavior.

Reviewed changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
tests/Opc.Ua.WotCon.Tests/TestMaterialization.cs	Shared TD/TM/invalid JSON builders used across registry/materialization tests.
tests/Opc.Ua.WotCon.Tests/Registry/XRegistryResourceStoreContractTests.cs	Shared contract test suite for IXRegistryResourceStore implementations.
tests/Opc.Ua.WotCon.Tests/Registry/WotResourceFileManagerTests.cs	Unit tests for the new WotResourceFileManager FileType behavior (handles, auth, bounds, commit).
tests/Opc.Ua.WotCon.Tests/Registry/WotRegistryTransactionTests.cs	Fault-injection tests for transactional commit outcomes and service publish semantics.
tests/Opc.Ua.WotCon.Tests/Registry/WotRegistryServiceTests.cs	Core CRUD/versioning/state tests for WotRegistryService.
tests/Opc.Ua.WotCon.Tests/Registry/WotRegistryServiceExtendedTests.cs	Additional coverage for group helpers, slug/normalize paths, and registry/group label APIs.
tests/Opc.Ua.WotCon.Tests/Registry/WotRegistryServiceCrudTests.cs	Tests for xRegistry CRUD methods used by UA management methods (group/resource create/delete, validate).
tests/Opc.Ua.WotCon.Tests/Registry/WotRegistryModelTests.cs	Value-object tests for digest/version/labels model types.
tests/Opc.Ua.WotCon.Tests/Registry/WotRegistryLabelsServiceTests.cs	Label/attribute service tests (validation, bounds, ordering, persistence).
tests/Opc.Ua.WotCon.Tests/Registry/WotBlobResourceStoreTests.cs	Runs the shared store contract against WotBlobResourceStore and validates on-disk layout expectations.
tests/Opc.Ua.WotCon.Tests/Registry/FileWotRegistryStoreExtendedTests.cs	File-store error-path and persistence regression coverage (manifest/blob/labels).
src/Opc.Ua.WotCon.Server/WotConnectivityNodeManager.cs	Updates method handler result types to match source-generated method state result types.
src/Opc.Ua.WotCon.Server/Registry/WotResourceFileManager.cs	New generalized FileType manager for registry document nodes (read snapshot, buffered write, commit-on-close).
src/Opc.Ua.WotCon.Server/Registry/WotRegistryPersistenceBounds.cs	New bounds object enforcing caps for documents, groups/resources, labels, etc.
src/Opc.Ua.WotCon.Server/Registry/WotRegistryModel.cs	New immutable snapshot model for registry/groups/resources/versions + digest and label ordering helpers.
src/Opc.Ua.WotCon.Server/Registry/WotLabelValidator.cs	Key/value validation for xRegistry labels prior to materialization into browseable nodes.
src/Opc.Ua.WotCon.Server/Registry/WotBlobResourceStore.cs	New IXRegistryResourceStore implementation using content-addressed blob files with atomic replace.
src/Opc.Ua.WotCon.Server/Registry/IWotRegistryStore.cs	Defines transactional commit contract + explicit commit outcome exceptions for external stores.
src/Opc.Ua.WotCon.Server/Registry/IWotRegistryService.cs	Defines the stable, injectable registry service API and DTOs/event args.
src/Opc.Ua.WotCon.Server/Registry/InMemoryWotRegistryStore.cs	In-memory implementation of the transactional store contract for tests/startup-seeded deployments.
src/Opc.Ua.WotCon.Server/Opc.Ua.WotCon.Server.csproj	Adds reference to Opc.Ua.XRegistry.Server.
src/Opc.Ua.WotCon.Server/Assets/WotAssetFileManager.cs	Updates handler delegate type to the source-generated method handler type.
src/Opc.Ua.Types/Utils/FileSystem/VirtualFileSystem.cs	Improves Replace atomic publish behavior using AddOrUpdate while preserving “no partial publish” semantics.

Suppressed comments (3)

tests/Opc.Ua.WotCon.Tests/Registry/XRegistryResourceStoreContractTests.cs:128

• Assert.Multiple(async () => ...) becomes an async-void lambda and can hide assertion failures. Capture the awaited values before entering Assert.Multiple and keep the delegate synchronous.

            Assert.Multiple(async () =>
            {
                Assert.That(document.Span.ToArray(),
                    Is.EqualTo(new byte[] { 0x01, 0xAA, 0xBB, 0x04 }));
                Assert.That(await store.GetLengthAsync("a").ConfigureAwait(false), Is.EqualTo(4),

tests/Opc.Ua.WotCon.Tests/Registry/XRegistryResourceStoreContractTests.cs:172

• Assert.Multiple(async () => ...) uses an async-void delegate, so the awaited ReadAsync and the asserts may run outside the test body. Await ReadAsync first, then assert synchronously inside Assert.Multiple.

            Assert.Multiple(async () =>
            {
                Assert.That(removed, Is.True);
                Assert.That(again, Is.False, "Deleting an absent key is a no-op, not a fault.");
                Assert.That(

tests/Opc.Ua.WotCon.Tests/Registry/XRegistryResourceStoreContractTests.cs:189

• Assert.Multiple(async () => ...) is async-void under NUnit and can drop failures from awaited reads. Await the reads first and then assert synchronously.

            Assert.Multiple(async () =>
            {
                Assert.That(
                    (await store.ReadAsync("a", 0, 16).ConfigureAwait(false)).Span.ToArray(),
                    Is.EqualTo(new byte[] { 0x01 }));