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/Ipc/Contracts.cs

@@ -4,7 +4,7 @@ using MessagePack;
 namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Ipc;
 
 // ============================================================================
-// Wire DTOs for the sidecar pipe protocol. The sidecar speaks its own legacy
+// Wire DTOs for the sidecar TCP protocol. The sidecar speaks its own legacy
 // shape (List<HistorianSample> etc.) — the .NET 10 client (PR 3.4) translates
 // to / from Core.Abstractions.DataValueSnapshot + HistoricalEvent.
 //

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware/Ipc/Framing.cs

@@ -1,7 +1,7 @@
 namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Ipc;
 
 /// <summary>
-///     Length-prefixed framing constants for the Wonderware historian sidecar pipe protocol.
+///     Length-prefixed framing constants for the Wonderware historian sidecar TCP protocol.
 ///     Each frame on the wire is:
 ///     <c>[4-byte big-endian length][1-byte message kind][MessagePack body]</c>.
 ///     Length is the body size only; the kind byte is not part of the prefixed length.