Phase 0 — mechanical rename ZB.MOM.WW.LmxOpcUa.* → ZB.MOM.WW.OtOpcUa.*

Renames all 11 projects (5 src + 6 tests), the .slnx solution file, all source-file namespaces, all axaml namespace references, and all v1 documentation references in CLAUDE.md and docs/*.md (excluding docs/v2/ which is already in OtOpcUa form). Also updates the TopShelf service registration name from "LmxOpcUa" to "OtOpcUa" per Phase 0 Task 0.6.

Preserves runtime identifiers per Phase 0 Out-of-Scope rules to avoid breaking v1/v2 client trust during coexistence: OPC UA `ApplicationUri` defaults (`urn:{GalaxyName}:LmxOpcUa`), server `EndpointPath` (`/LmxOpcUa`), `ServerName` default (feeds cert subject CN), `MxAccessConfiguration.ClientName` default (defensive — stays "LmxOpcUa" for MxAccess audit-trail consistency), client OPC UA identifiers (`ApplicationName = "LmxOpcUaClient"`, `ApplicationUri = "urn:localhost:LmxOpcUaClient"`, cert directory `%LocalAppData%\LmxOpcUaClient\pki\`), and the `LmxOpcUaServer` class name (class rename out of Phase 0 scope per Task 0.5 sed pattern; happens in Phase 1 alongside `LmxNodeManager → GenericDriverNodeManager` Core extraction). 23 LmxOpcUa references retained, all enumerated and justified in `docs/v2/implementation/exit-gate-phase-0.md`.

Build clean: 0 errors, 30 warnings (lower than baseline 167). Tests at strict improvement over baseline: 821 passing / 1 failing vs baseline 820 / 2 (one flaky pre-existing failure passed this run; the other still fails — both pre-existing and unrelated to the rename). `Client.UI.Tests`, `Historian.Aveva.Tests`, `Client.Shared.Tests`, `IntegrationTests` all match baseline exactly. Exit gate compliance results recorded in `docs/v2/implementation/exit-gate-phase-0.md` with all 7 checks PASS or DEFERRED-to-PR-review (#7 service install verification needs Windows service permissions on the reviewer's box).

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

src/ZB.MOM.WW.OtOpcUa.Host/MxAccess/MxAccessClient.EventHandlers.cs

@@ -0,0 +1,97 @@
+using System;
+using ArchestrA.MxAccess;
+using ZB.MOM.WW.OtOpcUa.Host.Domain;
+
+namespace ZB.MOM.WW.OtOpcUa.Host.MxAccess
+{
+    public sealed partial class MxAccessClient
+    {
+        /// <summary>
+        ///     COM event handler for MxAccess OnDataChange events.
+        ///     Signature matches the ArchestrA.MxAccess ILMXProxyServerEvents interface.
+        /// </summary>
+        private void HandleOnDataChange(
+            int hLMXServerHandle,
+            int phItemHandle,
+            object pvItemValue,
+            int pwItemQuality,
+            object pftItemTimeStamp,
+            ref MXSTATUS_PROXY[] ItemStatus)
+        {
+            try
+            {
+                if (!_handleToAddress.TryGetValue(phItemHandle, out var address))
+                {
+                    Log.Debug("OnDataChange for unknown handle {Handle}", phItemHandle);
+                    return;
+                }
+
+                var quality = QualityMapper.MapFromMxAccessQuality(pwItemQuality);
+
+                // Check MXSTATUS_PROXY — if success is false, use more specific quality
+                if (ItemStatus != null && ItemStatus.Length > 0 && ItemStatus[0].success == 0)
+                    quality = MxErrorCodes.MapToQuality(ItemStatus[0].detail);
+
+                var timestamp = ConvertTimestamp(pftItemTimeStamp);
+                var vtq = new Vtq(pvItemValue, timestamp, quality);
+
+                // Update probe timestamp
+                if (string.Equals(address, _probeTag, StringComparison.OrdinalIgnoreCase))
+                    _lastProbeValueTime = DateTime.UtcNow;
+
+                // Invoke stored subscription callback
+                if (_storedSubscriptions.TryGetValue(address, out var callback)) callback(address, vtq);
+
+                if (_pendingReadsByAddress.TryGetValue(address, out var pendingReads))
+                    foreach (var pendingRead in pendingReads.Values)
+                        pendingRead.TrySetResult(vtq);
+
+                // Global handler
+                OnTagValueChanged?.Invoke(address, vtq);
+            }
+            catch (Exception ex)
+            {
+                Log.Error(ex, "Error processing OnDataChange for handle {Handle}", phItemHandle);
+            }
+        }
+
+        /// <summary>
+        ///     COM event handler for MxAccess OnWriteComplete events.
+        /// </summary>
+        private void HandleOnWriteComplete(
+            int hLMXServerHandle,
+            int phItemHandle,
+            ref MXSTATUS_PROXY[] ItemStatus)
+        {
+            try
+            {
+                if (_pendingWrites.TryRemove(phItemHandle, out var tcs))
+                {
+                    var success = ItemStatus == null || ItemStatus.Length == 0 || ItemStatus[0].success != 0;
+                    if (success)
+                    {
+                        tcs.TrySetResult(true);
+                    }
+                    else
+                    {
+                        var detail = ItemStatus![0].detail;
+                        var message = MxErrorCodes.GetMessage(detail);
+                        Log.Warning("Write failed for handle {Handle}: {Message}", phItemHandle, message);
+                        tcs.TrySetResult(false);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Log.Error(ex, "Error processing OnWriteComplete for handle {Handle}", phItemHandle);
+            }
+        }
+
+        private static DateTime ConvertTimestamp(object pftItemTimeStamp)
+        {
+            if (pftItemTimeStamp is DateTime dt)
+                return dt.Kind == DateTimeKind.Utc ? dt : dt.ToUniversalTime();
+            return DateTime.UtcNow;
+        }
+    }
+}