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/SdkAlarmHistorianWriteBackend.cs

@@ -205,6 +205,19 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Backend
             {
                 historianEvent.Id = id;
             }
+            else
+            {
+                // Driver.Historian.Wonderware-004: an unparseable / empty EventId previously
+                // left Id as Guid.Empty, which made every such alarm collide on the same id
+                // with no diagnostic. Synthesize a fresh Guid so each event still gets a
+                // unique identifier (the historian still accepts the write — outcome stays
+                // Ack — and the sender can correlate the synthesized id via the warning log).
+                var synthesized = Guid.NewGuid();
+                Log.Warning(
+                    "Alarm historian event has non-parseable EventId {EventId} for source {Source}; synthesizing Id={SynthesizedId}",
+                    dto.EventId ?? "(null)", dto.SourceName ?? "(none)", synthesized);
+                historianEvent.Id = synthesized;
+            }
 #pragma warning restore CS0618
 
             if (!string.IsNullOrEmpty(dto.AckComment))