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/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/Phase7ComposerAliasTagTests.cs

@@ -7,19 +7,17 @@ namespace ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests;
 
 /// <summary>
 ///     Verifies the live-edit compose seam (<see cref="Phase7Composer.Compose"/>) treats a Galaxy
-///     point as an ordinary equipment tag now that <c>GalaxyMxGateway</c> is a standard
-///     Equipment-kind driver. An equipment-scoped <see cref="Tag"/> (non-null
-///     <see cref="Tag.EquipmentId"/>) bound to a <c>GalaxyMxGateway</c> driver living in an
-///     <c>Equipment</c>-kind namespace must surface under
-///     <see cref="Phase7CompositionResult.EquipmentTags"/> (carrying its driver-side FullName). The
-///     SystemPlatform-mirror <c>GalaxyTags</c> contract is retired entirely.
+///     point as an ordinary equipment tag: <c>GalaxyMxGateway</c> is a standard Equipment-kind driver.
+///     An equipment-scoped <see cref="Tag"/> (non-null <see cref="Tag.EquipmentId"/>) bound to a
+///     <c>GalaxyMxGateway</c> driver living in an <c>Equipment</c>-kind namespace must surface under
+///     <see cref="Phase7CompositionResult.EquipmentTags"/> (carrying its driver-side FullName).
 /// </summary>
 public sealed class Phase7ComposerAliasTagTests
 {
     /// <summary>A <c>GalaxyMxGateway</c> driver in an Equipment-kind namespace carries an
     /// equipment-scoped Galaxy tag (EquipmentId set, FolderPath null, TagConfig FullName = the Galaxy
     /// ref). Compose must put it in EquipmentTags with its FullName, coalescing the null FolderPath to
-    /// <c>string.Empty</c> (the SystemPlatform mirror producer is gone entirely).</summary>
+    /// <c>string.Empty</c>.</summary>
     [Fact]
     public void Compose_admits_galaxy_equipment_tag_in_equipment_tags()
     {