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/Domain/GalaxyRuntimeStatus.cs

@@ -0,0 +1,72 @@
+using System;
+
+namespace ZB.MOM.WW.OtOpcUa.Host.Domain
+{
+    /// <summary>
+    ///     Point-in-time runtime state of a single Galaxy runtime host ($WinPlatform or $AppEngine)
+    ///     as tracked by the <c>GalaxyRuntimeProbeManager</c>. Surfaced on the status dashboard and
+    ///     consumed by <c>HealthCheckService</c> so operators can detect a stopped host before
+    ///     downstream clients notice the stale data.
+    /// </summary>
+    public sealed class GalaxyRuntimeStatus
+    {
+        /// <summary>
+        ///     Gets or sets the Galaxy tag_name of the host (e.g., <c>DevPlatform</c> or
+        ///     <c>DevAppEngine</c>).
+        /// </summary>
+        public string ObjectName { get; set; } = "";
+
+        /// <summary>
+        ///     Gets or sets the Galaxy gobject_id of the host.
+        /// </summary>
+        public int GobjectId { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the Galaxy template category name — <c>$WinPlatform</c> or
+        ///     <c>$AppEngine</c>. Used by the dashboard to group hosts by kind.
+        /// </summary>
+        public string Kind { get; set; } = "";
+
+        /// <summary>
+        ///     Gets or sets the current runtime state.
+        /// </summary>
+        public GalaxyRuntimeState State { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the UTC timestamp of the most recent probe callback, whether it
+        ///     reported success or failure. <see langword="null"/> before the first callback.
+        /// </summary>
+        public DateTime? LastStateCallbackTime { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the UTC timestamp of the most recent <see cref="State"/> transition.
+        ///     Backs the dashboard "Since" column. <see langword="null"/> in the initial Unknown
+        ///     state before any transition.
+        /// </summary>
+        public DateTime? LastStateChangeTime { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the last <c>ScanState</c> value received from the probe, or
+        ///     <see langword="null"/> before the first update or when the last callback carried
+        ///     a non-success item status (no value delivered).
+        /// </summary>
+        public bool? LastScanState { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the detail message from the most recent failure callback, cleared on
+        ///     the next successful <c>ScanState = true</c> delivery.
+        /// </summary>
+        public string? LastError { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the cumulative number of callbacks where <c>ScanState = true</c>.
+        /// </summary>
+        public long GoodUpdateCount { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the cumulative number of callbacks where <c>ScanState != true</c>
+        ///     or the item status reported failure.
+        /// </summary>
+        public long FailureCount { get; set; }
+    }
+}