refactor(historian): single-parse ExtractTagHistorize + review-nit tests/docs

Stop parsing TagConfig twice per tag on the deploy hot path: Phase7Composer's
equipment-tag Select lambda is now block-bodied (captures isHistorized/historianTagname
once), and DeploymentArtifact.BuildEquipmentTagPlans captures locals before result.Add.
Add wrong-type-historianTagname InlineData to ExtractTagHistorizeTests. Extend the
parity round-trip fixture with a 4th tag (isHistorized:false + JSON-null tagname)
exercising the artifact-side private guard path. Align DeploymentArtifact's
ExtractTagHistorize doc-comment with the composer-side phrasing (ExtractTagFullName /
ExtractTagAlarm cross-reference).

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Composer.cs

@@ -335,18 +335,22 @@ public static class Phase7Composer
             .OrderBy(t => t.EquipmentId, StringComparer.Ordinal)
             .ThenBy(t => t.FolderPath ?? string.Empty, StringComparer.Ordinal) // coalesce so the sort matches the artifact-decode side exactly
             .ThenBy(t => t.Name, StringComparer.Ordinal)
-            .Select(t => new EquipmentTagPlan(
-                TagId: t.TagId,
-                EquipmentId: t.EquipmentId!,
-                DriverInstanceId: t.DriverInstanceId,
-                FolderPath: t.FolderPath ?? string.Empty,
-                Name: t.Name,
-                DataType: t.DataType,
-                FullName: ExtractTagFullName(t.TagConfig),
-                Writable: t.AccessLevel == TagAccessLevel.ReadWrite,
-                Alarm: ExtractTagAlarm(t.TagConfig),
-                IsHistorized: ExtractTagHistorize(t.TagConfig).IsHistorized,
-                HistorianTagname: ExtractTagHistorize(t.TagConfig).HistorianTagname))
+            .Select(t =>
+            {
+                var (isHistorized, historianTagname) = ExtractTagHistorize(t.TagConfig);
+                return new EquipmentTagPlan(
+                    TagId: t.TagId,
+                    EquipmentId: t.EquipmentId!,
+                    DriverInstanceId: t.DriverInstanceId,
+                    FolderPath: t.FolderPath ?? string.Empty,
+                    Name: t.Name,
+                    DataType: t.DataType,
+                    FullName: ExtractTagFullName(t.TagConfig),
+                    Writable: t.AccessLevel == TagAccessLevel.ReadWrite,
+                    Alarm: ExtractTagAlarm(t.TagConfig),
+                    IsHistorized: isHistorized,
+                    HistorianTagname: historianTagname);
+            })
             .ToList();
 
         // Per-equipment tag base = the shared substring-before-first-dot across each equipment's

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Drivers/DeploymentArtifact.cs

@@ -437,6 +437,7 @@ public static class DeploymentArtifact
             // ordinary equipment tags now (GalaxyMxGateway is a standard Equipment-kind driver).
             if (!equipmentNamespaces.Contains(nsId)) continue;
 
+            var (isHistorized, historianTagname) = ExtractTagHistorize(tagConfig);
             result.Add(new EquipmentTagPlan(
                 TagId: tagId!,
                 EquipmentId: equipmentId!,
@@ -447,8 +448,8 @@ public static class DeploymentArtifact
                 FullName: ExtractTagFullName(tagConfig),
                 Writable: writable,
                 Alarm: ExtractTagAlarm(tagConfig),
-                IsHistorized: ExtractTagHistorize(tagConfig).IsHistorized,
-                HistorianTagname: ExtractTagHistorize(tagConfig).HistorianTagname));
+                IsHistorized: isHistorized,
+                HistorianTagname: historianTagname));
         }
 
         result.Sort((a, b) =>
@@ -678,7 +679,8 @@ public static class DeploymentArtifact
     /// the <c>isHistorized</c> bool (absent / not a bool / non-object root / blank / malformed ⇒
     /// <c>false</c>) and the optional <c>historianTagname</c> string override (absent / not a string /
     /// whitespace-or-empty ⇒ <c>null</c>, meaning the historian tagname defaults to the tag's FullName,
-    /// resolved later). The raw string value is used — not trimmed. Never throws. The live-edit side
+    /// resolved later). The raw string value is used — not trimmed — matching <c>ExtractTagFullName</c> /
+    /// <c>ExtractTagAlarm</c>. Never throws. The live-edit side
     /// (<c>Phase7Composer.ExtractTagHistorize</c>) MUST parse identically (byte-parity).</summary>
     private static (bool IsHistorized, string? HistorianTagname) ExtractTagHistorize(string? tagConfig)
     {