fix(driver-historian-wonderware): resolve Low code-review findings (Driver.Historian.Wonderware-004,005,007,008,010,011,012)

- Driver.Historian.Wonderware-004: ToHistorianEvent synthesises a fresh
  Guid when the upstream EventId is unparseable and logs the substitution
  instead of writing the historian with Guid.Empty.
- Driver.Historian.Wonderware-005: GetHealthSnapshot derives the
  connection-open booleans from the active-node fields so the snapshot
  is self-consistent without depending on the secondary lock.
- Driver.Historian.Wonderware-007: SID-mismatch branch in PipeServer now
  sends a HelloAck { Accepted=false, RejectReason } so the client sees a
  symmetric rejection.
- Driver.Historian.Wonderware-008: classify StartQuery failures —
  connection-class codes drop the connection, query-class codes throw
  QueryClassStartQueryException so the IPC layer surfaces Success=false.
- Driver.Historian.Wonderware-010: RequestTimeoutSeconds now enforced
  via BuildRequestCts linked to the caller's CancellationToken.
- Driver.Historian.Wonderware-011: refreshed XML docs to describe the
  current sidecar / named-pipe architecture (Galaxy.Host / Proxy
  references reframed as historical context).
- Driver.Historian.Wonderware-012: pinned the previously-uncovered
  HistorianDataSource behaviours with five new test files; also removed
  the stale empty tests/ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Tests
  directory.

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

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware/Backend/HistorianSample.cs

@@ -3,10 +3,11 @@ using System;
 namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Backend
 {
     /// <summary>
-    ///     OPC-UA-free representation of a single historical data point. The Host returns these
-    ///     across the IPC boundary as <c>GalaxyDataValue</c>; the Proxy maps quality and value to
-    ///     OPC UA <c>DataValue</c>. Raw MX quality byte is preserved so the Proxy can use the same
-    ///     quality mapper it already uses for live reads.
+    ///     OPC-UA-free representation of a single historical data point. The sidecar serialises
+    ///     these onto the named-pipe wire (<c>HistorianSampleDto</c>) for the .NET 10
+    ///     <c>WonderwareHistorianClient</c>, which maps quality and value into OPC UA
+    ///     <c>DataValue</c> on its side. Raw OPC DA quality byte is preserved so the client
+    ///     can reuse the same quality mapper it already uses for live reads.
     /// </summary>
     public sealed class HistorianSample
     {
@@ -20,7 +21,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Backend
 
     /// <summary>
     ///     Result of <see cref="IHistorianDataSource.ReadAggregateAsync"/>. When <see cref="Value"/> is
-    ///     null the aggregate is unavailable for that bucket (Proxy maps to <c>BadNoData</c>).
+    ///     null the aggregate is unavailable for that bucket — the client maps to <c>BadNoData</c>.
     /// </summary>
     public sealed class HistorianAggregateSample
     {