PR 3.4 — Wonderware historian sidecar .NET 10 client

New project Driver.Historian.Wonderware.Client (net10 x64) implements both
Core.Abstractions.IHistorianDataSource (read paths consumed by the server's
IHistoryRouter) and Core.AlarmHistorian.IAlarmHistorianWriter (alarm-event
drain consumed by SqliteStoreAndForwardSink) against the sidecar's PR 3.3
pipe protocol.

Wire-format files (Framing/MessageKind, Hello, Contracts, FrameReader,
FrameWriter) are byte-identical mirrors of the sidecar's net48 originals —
the sidecar can't be referenced as a ProjectReference because of the
runtime/bitness gap, so we duplicate and pin the wire bytes via tests.

PipeChannel owns one bidirectional NamedPipeClientStream + Hello handshake +
serializes calls. Single in-flight at a time (semaphore); transport failures
trigger one in-flight reconnect-and-retry before propagating. Connect is
abstracted behind a Func<CancellationToken, Task<Stream>> so tests inject
in-process pipes.

WonderwareHistorianClient maps:
- HistorianSampleDto.Quality (raw OPC DA byte) → OPC UA StatusCode uint via
  QualityMapper (port of HistorianQualityMapper from sidecar).
- HistorianAggregateSampleDto.Value=null → BadNoData (0x800E0000).
- WriteAlarmEventsReply.PerEventOk[i]=true → Ack, false → RetryPlease.
  Whole-call failure or transport exception → RetryPlease for every event in
  the batch (drain worker handles backoff).
- AlarmHistorianEvent → AlarmHistorianEventDto with severity bucketed via
  AlarmSeverity-to-ushort mapping (Low=250, Medium=500, High=700, Crit=900).

GetHealthSnapshot tracks transport success + sidecar-reported failure
separately; ConsecutiveFailures rises on operation-level errors, not just
transport drops.

10 round-trip tests via FakeSidecarServer (in-process net10 fake using the
client's own framing): byte→uint quality mapping, null-bucket BadNoData,
at-time order preservation, event-field round-trip, sidecar error surfacing,
WriteBatch per-event status, whole-call retry-please mapping, Hello
shared-secret rejection, transport-drop reconnect-and-retry, health snapshot
counters.

PR 3.W will register this client as IHistorianDataSource + IAlarmHistorianWriter
in OpcUaServerService DI.

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

src/ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Client/Ipc/FrameReader.cs

@@ -0,0 +1,63 @@
+using MessagePack;
+
+namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Client.Ipc;
+
+/// <summary>
+///     Reads length-prefixed, kind-tagged frames from a stream. Single-consumer — do not call
+///     <see cref="ReadFrameAsync"/> from multiple threads against the same instance. Mirror of
+///     the sidecar's <c>FrameReader</c>; kept byte-identical so the wire protocol stays stable.
+/// </summary>
+public sealed class FrameReader : IDisposable
+{
+    private readonly Stream _stream;
+    private readonly bool _leaveOpen;
+
+    public FrameReader(Stream stream, bool leaveOpen = false)
+    {
+        _stream = stream ?? throw new ArgumentNullException(nameof(stream));
+        _leaveOpen = leaveOpen;
+    }
+
+    public async Task<(MessageKind Kind, byte[] Body)?> ReadFrameAsync(CancellationToken ct)
+    {
+        var lengthPrefix = new byte[Framing.LengthPrefixSize];
+        if (!await ReadExactAsync(lengthPrefix, ct).ConfigureAwait(false))
+            return null; // clean EOF on frame boundary
+
+        var length = (lengthPrefix[0] << 24) | (lengthPrefix[1] << 16) | (lengthPrefix[2] << 8) | lengthPrefix[3];
+        if (length < 0 || length > Framing.MaxFrameBodyBytes)
+            throw new InvalidDataException($"Sidecar IPC frame length {length} out of range.");
+
+        var kindByte = _stream.ReadByte();
+        if (kindByte < 0) throw new EndOfStreamException("EOF after length prefix, before kind byte.");
+
+        var body = new byte[length];
+        if (!await ReadExactAsync(body, ct).ConfigureAwait(false))
+            throw new EndOfStreamException("EOF mid-frame.");
+
+        return ((MessageKind)(byte)kindByte, body);
+    }
+
+    public static T Deserialize<T>(byte[] body) => MessagePackSerializer.Deserialize<T>(body);
+
+    private async Task<bool> ReadExactAsync(byte[] buffer, CancellationToken ct)
+    {
+        var offset = 0;
+        while (offset < buffer.Length)
+        {
+            var read = await _stream.ReadAsync(buffer.AsMemory(offset, buffer.Length - offset), ct).ConfigureAwait(false);
+            if (read == 0)
+            {
+                if (offset == 0) return false;
+                throw new EndOfStreamException($"Stream ended after reading {offset} of {buffer.Length} bytes.");
+            }
+            offset += read;
+        }
+        return true;
+    }
+
+    public void Dispose()
+    {
+        if (!_leaveOpen) _stream.Dispose();
+    }
+}