feat(historian): #677 Part 13/SDK reverse anchoring, start-of-data Partial, AggregateConfiguration, IntegralDivisor

- BucketPlan: reverse processed reads anchored at the later time for every
  aggregate: window (end, start], partial interval earliest, results stamped
  with the later edge, latest first (SDK CreateSlice/GetTimestamp/backward
  GetValues). SqlServer adds @bucketAdjustTicks + flips the window predicate;
  QuestDB binds BucketBaseUnixTicks. IndexOf is the C# statement of the math.
- Partial bit on the interval the tag's data starts inside (SDK m_startOfData),
  every aggregate but Average; per-sample reads fetch the earliest sample.
- Node manager: non-default client AggregateConfiguration =>
  BadAggregateConfigurationRejected per node (ServerAggregateConfiguration,
  pinned to the SDK AggregateManager defaults).
- GatewayTagProvisioner sends IntegralDivisor = 1.
- SDK parity oracle (Opc.Ua.Server calculators) in unit + both backends'
  conformance suites, forward and reverse; remaining divergences documented.
- docs/Historian.md + CLAUDE.md release note (client-visible).

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.SqlServer.IntegrationTests/ZB.MOM.WW.OtOpcUa.Driver.Historian.SqlServer.IntegrationTests.csproj

@@ -13,6 +13,8 @@
         <PackageReference Include="xunit.v3"/>
         <PackageReference Include="Shouldly"/>
         <PackageReference Include="Microsoft.NET.Test.Sdk"/>
+        <!-- SDK Part 13 aggregate calculators: the conformance suite's processed-read parity oracle (#677). -->
+        <PackageReference Include="OPCFoundation.NetStandard.Opc.Ua.Server"/>
         <PackageReference Include="xunit.runner.visualstudio">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>