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/Historian/HistoryContinuationPoint.cs

@@ -0,0 +1,97 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using Opc.Ua;
+using Serilog;
+
+namespace ZB.MOM.WW.OtOpcUa.Host.Historian
+{
+    /// <summary>
+    ///     Manages continuation points for OPC UA HistoryRead requests that return
+    ///     more data than the per-request limit allows.
+    /// </summary>
+    internal sealed class HistoryContinuationPointManager
+    {
+        private static readonly ILogger Log = Serilog.Log.ForContext<HistoryContinuationPointManager>();
+
+        private readonly ConcurrentDictionary<Guid, StoredContinuation> _store = new();
+        private readonly TimeSpan _timeout;
+
+        public HistoryContinuationPointManager() : this(TimeSpan.FromMinutes(5)) { }
+
+        internal HistoryContinuationPointManager(TimeSpan timeout)
+        {
+            _timeout = timeout;
+        }
+
+        /// <summary>
+        ///     Stores remaining data values and returns a continuation point identifier.
+        /// </summary>
+        public byte[] Store(List<DataValue> remaining)
+        {
+            PurgeExpired();
+            var id = Guid.NewGuid();
+            _store[id] = new StoredContinuation(remaining, DateTime.UtcNow);
+            Log.Debug("Stored history continuation point {Id} with {Count} remaining values", id, remaining.Count);
+            return id.ToByteArray();
+        }
+
+        /// <summary>
+        ///     Retrieves and removes the remaining data values for a continuation point.
+        ///     Returns null if the continuation point is invalid or expired.
+        /// </summary>
+        public List<DataValue>? Retrieve(byte[] continuationPoint)
+        {
+            PurgeExpired();
+            if (continuationPoint == null || continuationPoint.Length != 16)
+                return null;
+
+            var id = new Guid(continuationPoint);
+            if (!_store.TryRemove(id, out var stored))
+                return null;
+
+            if (DateTime.UtcNow - stored.CreatedAt > _timeout)
+            {
+                Log.Debug("History continuation point {Id} expired", id);
+                return null;
+            }
+
+            return stored.Values;
+        }
+
+        /// <summary>
+        ///     Releases a continuation point without retrieving its data.
+        /// </summary>
+        public void Release(byte[] continuationPoint)
+        {
+            PurgeExpired();
+            if (continuationPoint == null || continuationPoint.Length != 16)
+                return;
+
+            var id = new Guid(continuationPoint);
+            _store.TryRemove(id, out _);
+        }
+
+        private void PurgeExpired()
+        {
+            var cutoff = DateTime.UtcNow - _timeout;
+            foreach (var kvp in _store)
+            {
+                if (kvp.Value.CreatedAt < cutoff)
+                    _store.TryRemove(kvp.Key, out _);
+            }
+        }
+
+        private sealed class StoredContinuation
+        {
+            public StoredContinuation(List<DataValue> values, DateTime createdAt)
+            {
+                Values = values;
+                CreatedAt = createdAt;
+            }
+
+            public List<DataValue> Values { get; }
+            public DateTime CreatedAt { get; }
+        }
+    }
+}