Auto: abcip-4.1 — per-tag scan rate / scan group bucketing

Closes #238

src/ZB.MOM.WW.OtOpcUa.Driver.AbCip/AbCipDriverOptions.cs

@@ -269,6 +269,16 @@ public enum AddressingMode
 ///     in pre-declared config). Surfaces as the OPC UA <c>Description</c> attribute on the
 ///     produced Variable node so SCADA / engineering clients see the comment from the source
 ///     project. <c>null</c> leaves Description unset, matching pre-2.3 behaviour.</param>
+/// <param name="ScanRateMs">PR abcip-4.1 — optional per-tag publish rate (in milliseconds) that
+///     overrides the subscription's default <c>publishingInterval</c> for this tag. Mirrors
+///     Kepware's "scan classes" + Siemens / Mitsubishi per-tag scan groups; the driver buckets
+///     tags by resolved interval at <see cref="AbCipDriver.SubscribeAsync"/> time + runs one
+///     <see cref="Core.Abstractions.PollGroupEngine"/> loop per distinct interval so a fast HMI
+///     tag is not delayed behind a slow batch tag's 10 s tick. <c>null</c> = use the subscription
+///     default (legacy behaviour). The 100 ms floor enforced by the engine still applies — a
+///     <c>ScanRateMs &lt; 100</c> is clamped up. UDT member tags inherit the parent tag's
+///     <c>ScanRateMs</c> at member-fan-out time. See
+///     <c>docs/drivers/AbCip-Operability.md</c> §"Per-tag scan rate".</param>
 public sealed record AbCipTagDefinition(
     string Name,
     string DeviceHostAddress,
@@ -279,7 +289,8 @@ public sealed record AbCipTagDefinition(
     IReadOnlyList<AbCipStructureMember>? Members = null,
     bool SafetyTag = false,
     int? StringLength = null,
-    string? Description = null);
+    string? Description = null,
+    int? ScanRateMs = null);
 
 /// <summary>
 ///     One declared member of a UDT tag. Name is the member identifier on the PLC (e.g. <c>Speed</c>,