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/IHistorianDataSource.cs

@@ -6,9 +6,11 @@ using System.Threading.Tasks;
 namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Backend
 {
     /// <summary>
-    ///     OPC-UA-free surface for the Wonderware Historian subsystem inside Galaxy.Host.
-    ///     Implementations read via the aahClient* SDK; the Proxy side maps returned samples
-    ///     to OPC UA <c>DataValue</c>.
+    ///     OPC-UA-free surface for the Wonderware Historian subsystem inside the historian
+    ///     sidecar process. Implementations read via the aahClient* SDK; the .NET 10
+    ///     <c>WonderwareHistorianClient</c> on the other side of the named-pipe IPC maps
+    ///     returned samples to OPC UA <c>DataValue</c>. The v1 Galaxy.Host / Proxy hosts
+    ///     this lived in retired in PR 7.2.
     /// </summary>
     public interface IHistorianDataSource : IDisposable
     {