refactor(driver-historian-wonderware-client): extract WonderwareHistorianClientOptions to .Contracts

Move WonderwareHistorianClientOptions to a new
Driver.Historian.Wonderware.Client.Contracts sibling project. The record
had no using directives and uses only primitive types (string, TimeSpan)
so the contracts project is dependency-free.

Convert one doc-comment reference:
  <see cref="WonderwareHistorianClient"/> → <c>WonderwareHistorianClient</c>
per the approved decision — no compilable usings were present.

The runtime Driver.Historian.Wonderware.Client project gains a
ProjectReference to .Contracts; the .slnx is updated accordingly.

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Client.Contracts/WonderwareHistorianClientOptions.cs

@@ -0,0 +1,33 @@
+namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Client;
+
+/// <summary>
+///     Connection options for <c>WonderwareHistorianClient</c>.
+/// </summary>
+/// <remarks>
+///     <para>
+///         <b>Retry / backoff ownership (finding 006):</b> this module performs exactly one
+///         in-place transport reconnect inside <c>PipeChannel.InvokeAsync</c> with no delay,
+///         and does NOT implement exponential reconnect backoff. Broader retry/backoff is the
+///         caller's responsibility — the alarm drain worker
+///         (<c>Core.AlarmHistorian.SqliteStoreAndForwardSink</c>) and the read-side
+///         history router are expected to layer their own backoff on top.
+///     </para>
+/// </remarks>
+/// <param name="PipeName">Named-pipe name the sidecar listens on (matches the sidecar's <c>OTOPCUA_HISTORIAN_PIPE</c>).</param>
+/// <param name="SharedSecret">Per-process shared secret the sidecar will verify in the Hello frame.</param>
+/// <param name="PeerName">Diagnostic peer identifier sent in Hello — typically the OtOpcUa instance id.</param>
+/// <param name="ConnectTimeout">Cap on the named-pipe connect + Hello round trip on each (re)connect.</param>
+/// <param name="CallTimeout">Cap on a single read/write call once connected.</param>
+public sealed record WonderwareHistorianClientOptions(
+    string PipeName,
+    string SharedSecret,
+    string PeerName = "OtOpcUa",
+    TimeSpan? ConnectTimeout = null,
+    TimeSpan? CallTimeout = null)
+{
+    /// <summary>Gets the effective connect timeout, using the default if not explicitly set.</summary>
+    public TimeSpan EffectiveConnectTimeout => ConnectTimeout ?? TimeSpan.FromSeconds(10);
+
+    /// <summary>Gets the effective call timeout, using the default if not explicitly set.</summary>
+    public TimeSpan EffectiveCallTimeout => CallTimeout ?? TimeSpan.FromSeconds(30);
+}

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Client.Contracts/ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Client.Contracts.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    </PropertyGroup>
+    <!-- NO PackageReference. NO ProjectReference. -->
+</Project>