fix(driver-historian-wonderware): resolve Medium code-review finding (Driver.Historian.Wonderware-009)

Apply _config.MaxValuesPerRead as a bucket cap in ReadAggregateAsync,
mirroring the existing cap in ReadRawAsync. Without this guard a processed
read over a wide time range with a small IntervalMs could accumulate an
unbounded HistorianAggregateSample list; if the serialised reply exceeded
the 16 MiB FrameWriter frame cap WriteAsync would throw and the client
correlation-id wait would hang. Truncation now logs a Warning with a hint
to widen IntervalMs or reduce the time range.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -373,6 +373,12 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Backend
                     return Task.FromResult(results);
                 }
 
+                // Apply the same bucket cap as the raw-read path so a wide time range with a
+                // small IntervalMs cannot produce an unbounded result set that would overflow
+                // the 16 MiB FrameWriter frame cap and lose the entire reply.
+                var bucketLimit = _config.MaxValuesPerRead;
+                var bucketCount = 0;
+
                 while (query.MoveNext(out error))
                 {
                     ct.ThrowIfCancellationRequested();
@@ -386,6 +392,15 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Wonderware.Backend
                         Value = value,
                         TimestampUtc = timestamp,
                     });
+
+                    bucketCount++;
+                    if (bucketLimit > 0 && bucketCount >= bucketLimit)
+                    {
+                        Log.Warning(
+                            "HistoryRead aggregate ({Aggregate}): {Tag} truncated at {Limit} buckets — widen IntervalMs or reduce time range",
+                            aggregateColumn, tagName, bucketLimit);
+                        break;
+                    }
                 }
 
                 query.EndQuery(out _);