feat(mtconnect): authoring DataType warning + loud ignored-DeviceName warning (#613 slice)

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

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect/MTConnectDriver.cs

@@ -3232,6 +3232,29 @@ public sealed class MTConnectDriver
 
     // ---- v3 tag binding: RawPath ↔ dataItemId, and the definitions the index coerces against ----
 
+    /// <summary>
+    ///     Names the distinct, non-blank <see cref="RawTagEntry.DeviceName"/> values when there are two or
+    ///     more, else <c>null</c> (#613). The driver never routes by that field — one instance owns one
+    ///     Agent client — so differing values mean the author expects a split the driver silently does
+    ///     not perform. A single value is NOT reported: it is the <c>/raw</c> Device's own name, which
+    ///     routinely differs from the Agent's device name and would make the warning noise.
+    /// </summary>
+    /// <param name="rawTags">The authored raw tags.</param>
+    /// <returns>A comma-joined, sorted list of the distinct names, or <c>null</c> when fewer than two.</returns>
+    internal static string? DescribeIgnoredDeviceNames(IReadOnlyList<RawTagEntry> rawTags)
+    {
+        var names = new SortedSet<string>(StringComparer.Ordinal);
+        foreach (var entry in rawTags)
+        {
+            if (entry is not null && !string.IsNullOrWhiteSpace(entry.DeviceName))
+            {
+                names.Add(entry.DeviceName.Trim());
+            }
+        }
+
+        return names.Count >= 2 ? string.Join(", ", names) : null;
+    }
+
     /// <summary>
     ///     Derives the driver's tag tables from an options document — the <c>RawPath → dataItemId</c>
     ///     translation the data plane runs through, its reverse, and the definition set the
@@ -3295,6 +3318,13 @@ public sealed class MTConnectDriver
                 BuildWriteTargets(only, probeModel, options.DeviceName));
         }
 
+        if (DescribeIgnoredDeviceNames(options.RawTags) is { } ignoredDevices)
+        {
+            _logger.LogWarning(
+                "MTConnect driver {DriverInstanceId}: raw tags carry differing DeviceName values ({DeviceNames}), but RawTagEntry.DeviceName is not used for routing — every tag is served from the one Agent connection scoped by the driver-level DeviceName ({ConfiguredDevice}). Author one MTConnect driver instance per Agent device if they must be kept apart.",
+                _driverInstanceId, ignoredDevices, options.DeviceName ?? "<whole Agent>");
+        }
+
         var declared = IndexProbeDataItems(probeModel);
         var idByRawPath = new Dictionary<string, string>(options.RawTags.Count, StringComparer.Ordinal);
         var rawPathsById = new Dictionary<string, List<string>>(StringComparer.Ordinal);