fix(opcua): equipment-tag planner diff + folder-scoped NodeIds (review findings)

Two bundle-review fixes + idempotency coverage:
- CRITICAL: the planner ignored EquipmentTags, so an incremental deploy changing only
  equipment tags produced an empty plan and HandleRebuild short-circuited before
  materialising them. Add TagId to EquipmentTagPlan + Added/Removed/ChangedEquipmentTags
  to Phase7Plan (diffed by TagId, in IsEmpty, driving Apply's needsRebuild) — mirroring
  the GalaxyTags treatment.
- IMPORTANT: equipment variable NodeId was the raw driver FullName, which collides across
  identical machines (e.g. two PLCs both exposing register 40001) — the second variable
  was silently dropped. NodeId is now folder-scoped (parent/Name); FullName stays on
  EquipmentTagPlan for the later values-routing milestone.
- Task 4: SDK-backed idempotency test (double-apply -> single variable); restart-safety
  confirmed (RestoreApplied reuses the same RebuildAddressSpace -> HandleRebuild path).
- Minor: align composer equipment-tag sort with the artifact decoder (coalesce FolderPath).

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Plan.cs

@@ -26,17 +26,33 @@ public sealed record Phase7Plan(
     IReadOnlyList<GalaxyTagPlan> RemovedGalaxyTags,
     IReadOnlyList<Phase7Plan.GalaxyTagDelta> ChangedGalaxyTags)
 {
+    /// <summary>
+    ///     Equipment-namespace tag diff sets, keyed by <see cref="EquipmentTagPlan.TagId"/>. Added as
+    ///     init-only members (defaulting empty) rather than positional parameters so existing
+    ///     <c>Phase7Plan</c> construction sites compile unchanged — consistent with how
+    ///     <see cref="Phase7CompositionResult.EquipmentTags"/> was added. Without these, an
+    ///     incremental deploy that changes ONLY equipment tags produced an empty plan and
+    ///     <c>OpcUaPublishActor.HandleRebuild</c> short-circuited before materialising them.
+    /// </summary>
+    public IReadOnlyList<EquipmentTagPlan> AddedEquipmentTags { get; init; } = Array.Empty<EquipmentTagPlan>();
+    /// <inheritdoc cref="AddedEquipmentTags"/>
+    public IReadOnlyList<EquipmentTagPlan> RemovedEquipmentTags { get; init; } = Array.Empty<EquipmentTagPlan>();
+    /// <inheritdoc cref="AddedEquipmentTags"/>
+    public IReadOnlyList<EquipmentTagDelta> ChangedEquipmentTags { get; init; } = Array.Empty<EquipmentTagDelta>();
+
     /// <summary>Gets a value indicating whether the composition plan contains no changes.</summary>
     public bool IsEmpty =>
         AddedEquipment.Count == 0 && RemovedEquipment.Count == 0 && ChangedEquipment.Count == 0 &&
         AddedDrivers.Count == 0 && RemovedDrivers.Count == 0 && ChangedDrivers.Count == 0 &&
         AddedAlarms.Count == 0 && RemovedAlarms.Count == 0 && ChangedAlarms.Count == 0 &&
-        AddedGalaxyTags.Count == 0 && RemovedGalaxyTags.Count == 0 && ChangedGalaxyTags.Count == 0;
+        AddedGalaxyTags.Count == 0 && RemovedGalaxyTags.Count == 0 && ChangedGalaxyTags.Count == 0 &&
+        AddedEquipmentTags.Count == 0 && RemovedEquipmentTags.Count == 0 && ChangedEquipmentTags.Count == 0;
 
     public sealed record EquipmentDelta(EquipmentNode Previous, EquipmentNode Current);
     public sealed record DriverDelta(DriverInstancePlan Previous, DriverInstancePlan Current);
     public sealed record AlarmDelta(ScriptedAlarmPlan Previous, ScriptedAlarmPlan Current);
     public sealed record GalaxyTagDelta(GalaxyTagPlan Previous, GalaxyTagPlan Current);
+    public sealed record EquipmentTagDelta(EquipmentTagPlan Previous, EquipmentTagPlan Current);
 }
 
 public static class Phase7Planner
@@ -74,11 +90,21 @@ public static class Phase7Planner
             t => t.TagId,
             (a, b) => new Phase7Plan.GalaxyTagDelta(a, b));
 
+        var (addedEqTags, removedEqTags, changedEqTags) = DiffById(
+            previous.EquipmentTags, next.EquipmentTags,
+            t => t.TagId,
+            (a, b) => new Phase7Plan.EquipmentTagDelta(a, b));
+
         return new Phase7Plan(
             addedEq, removedEq, changedEq,
             addedDrv, removedDrv, changedDrv,
             addedAlarm, removedAlarm, changedAlarm,
-            addedGalaxy, removedGalaxy, changedGalaxy);
+            addedGalaxy, removedGalaxy, changedGalaxy)
+        {
+            AddedEquipmentTags = addedEqTags,
+            RemovedEquipmentTags = removedEqTags,
+            ChangedEquipmentTags = changedEqTags,
+        };
     }
 
     private static (IReadOnlyList<T> Added, IReadOnlyList<T> Removed, IReadOnlyList<TDelta> Changed)