feat(twincat): opt-in ADS sum-read and /hosts diagnostics bag; refresh TwinCAT backlog (#645, #612)

Sum-read (#310): batches a poll's reads per device into sum commands capped at sumReadMaxItems,
per-item ADS errors mapped per tag, falls back to individual reads when the target refuses the
command. Diagnostics (#314): ADS state, app name, online-change count, task cycle/exec/jitter via
IDriverDiagnostics. Re-implemented against the current raw-byte read path (stranded auto/driver-gaps
commits predate it). Sum-write not ported. Unit tests only; live gate pending a route.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT/TwinCATDriverFactoryExtensions.cs

@@ -78,6 +78,8 @@ public static class TwinCATDriverFactoryExtensions
             UseNativeNotifications = dto.UseNativeNotifications ?? true,
             EnableControllerBrowse = dto.EnableControllerBrowse ?? false,
             NotificationMaxDelayMs = dto.NotificationMaxDelayMs ?? 0,
+            UseSumRead = dto.UseSumRead ?? false,
+            SumReadMaxItems = dto.SumReadMaxItems ?? 200,
         };
     }
 
@@ -114,6 +116,12 @@ public static class TwinCATDriverFactoryExtensions
         /// <summary>Gets or sets the maximum notification delay in milliseconds.</summary>
         public int? NotificationMaxDelayMs { get; init; }
 
+        /// <summary>Gets or sets a value indicating whether a poll's reads are batched into ADS sum-reads.</summary>
+        public bool? UseSumRead { get; init; }
+
+        /// <summary>Gets or sets the maximum symbols per sum-read command.</summary>
+        public int? SumReadMaxItems { get; init; }
+
         /// <summary>Gets or sets the list of configured devices.</summary>
         public List<TwinCATDeviceDto>? Devices { get; init; }