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/HistorianConfiguration.cs

@@ -3,9 +3,12 @@ using System.Collections.Generic;
 namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Backend
 {
     /// <summary>
-    ///     Wonderware Historian SDK configuration. Populated from environment variables at Host
-    ///     startup (see <c>Program.cs</c>) or from the Proxy's <c>DriverInstance.DriverConfig</c>
-    ///     section passed during OpenSession. Kept OPC-UA-free — the Proxy side owns UA translation.
+    ///     Wonderware Historian SDK configuration. Populated from environment variables at
+    ///     sidecar startup (see <c>Program.cs</c>): the supervisor (lmxopcua-side
+    ///     <c>WonderwareHistorianClient</c>) spawns the sidecar with these env vars; UA
+    ///     translation lives on the client side of the named-pipe IPC, so this surface is
+    ///     kept OPC-UA-free. The legacy v1 Galaxy.Host / Proxy host this lived in retired
+    ///     in PR 7.2.
     /// </summary>
     public sealed class HistorianConfiguration
     {