review(Driver.Historian.Wonderware): AtTime fails over on connection-class errors

Re-review at 7286d320. -014 (Medium): ReadAtTimeAsync didn't classify StartQuery failures,
so a connection-class failure left a dead connection, re-failed every timestamp, and returned
Success=true with all-Bad (no failover); now resets+fails over via a shared classifier + tests.
-015: refresh stale named-pipe comments to TCP (no wire change). -013 (silent cap truncation,
ties OpcUaServer-002/Core.Abstractions-009) deferred cross-module. NOTE: the SDK-touching tests
are net48 + native aahClientManaged and run only on Windows; macOS verifies build + the SDK-free
subset only.

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

@@ -4,7 +4,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Backend
 {
     /// <summary>
     ///     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
+    ///     these onto the TCP 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.