docs(galaxy): neutralize remaining stale SystemPlatform/alias terminology in comments + a test name

Replace "SystemPlatform mirror tag", "Galaxy alias", and "SystemPlatform-kind" in doc-comments and
test names with neutral accurate wording ("FolderPath-scoped tag", "EquipmentId == null", etc.).
No code, logic, or test bodies changed — comments and one test method name only.

tests/Core/ZB.MOM.WW.OtOpcUa.Configuration.Tests/DraftValidatorTests.cs

@@ -123,9 +123,8 @@ public sealed class DraftValidatorTests
     }
 
     /// <summary>Verifies that the canonical Galaxy driver type (GalaxyMxGateway, per PR 7.2 —
-    /// it was "Galaxy" pre-PR-7.2) is now a standard Equipment-kind driver: binding it to an
-    /// Equipment namespace produces no kind-mismatch error (the SystemPlatform namespace split
-    /// is being retired — Galaxy under Equipment is valid).</summary>
+    /// it was "Galaxy" pre-PR-7.2) is a standard Equipment-kind driver: binding it to an
+    /// Equipment namespace produces no kind-mismatch error.</summary>
     [Fact]
     public void GalaxyMxGateway_driver_in_Equipment_namespace_is_allowed()
     {
@@ -357,10 +356,10 @@ public sealed class DraftValidatorTests
         DraftValidator.Validate(draft).ShouldNotContain(e => e.Code == "EquipmentSignalNameCollision");
     }
 
-    /// <summary>Verifies that a SystemPlatform Tag (EquipmentId == null) is excluded from the
+    /// <summary>Verifies that a FolderPath-scoped tag (EquipmentId == null) is excluded from the
     /// equipment-signal node space and so never collides with an equipment VirtualTag.</summary>
     [Fact]
-    public void SystemPlatform_tag_sharing_name_with_equipment_vtag_excluded()
+    public void Unbound_tag_EquipmentId_null_does_not_collide_with_equipment_vtag()
     {
         var draft = new DraftSnapshot
         {