feat(hosts): driver diagnostics channel on /hosts, S7 negotiated PDU size first (#640)

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

src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/IDriverHealthPublisher.cs

@@ -34,6 +34,10 @@ public interface IDriverHealthPublisher
     ///     <see cref="ISkippedTagReporter"/>. Contradicts the "Healthy, 0 errors, reads advancing" reading
     ///     of a driver that is in fact ignoring part or all of its configuration (Gitea #541).
     /// </param>
+    /// <param name="diagnostics">
+    ///     Bounded driver diagnostics from <see cref="IDriverDiagnostics.GetDiagnostics"/>; null when the
+    ///     driver is not an <see cref="IDriverDiagnostics"/> (Gitea #640).
+    /// </param>
     void Publish(
         string clusterId,
         string driverInstanceId,
@@ -42,7 +46,8 @@ public interface IDriverHealthPublisher
         DateTime? rediscoveryNeededUtc = null,
         string? rediscoveryReason = null,
         IReadOnlyList<HostConnectivityStatus>? hostStatuses = null,
-        SkippedTagReport? skippedTags = null);
+        SkippedTagReport? skippedTags = null,
+        IReadOnlyDictionary<string, string>? diagnostics = null);
 }
 
 /// <summary>
@@ -65,6 +70,7 @@ public sealed class NullDriverHealthPublisher : IDriverHealthPublisher
         DateTime? rediscoveryNeededUtc = null,
         string? rediscoveryReason = null,
         IReadOnlyList<HostConnectivityStatus>? hostStatuses = null,
-        SkippedTagReport? skippedTags = null)
+        SkippedTagReport? skippedTags = null,
+        IReadOnlyDictionary<string, string>? diagnostics = null)
     { /* no-op */ }
 }