fix: match active fixture document by stable name

Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/FirstLimitedApplyAutomation.cs

@@ -199,7 +199,8 @@ internal sealed class FirstLimitedApplyAutomationCoordinator
             // coordinator receives the returned Document. Confirm the current
             // active document after assignment so that one missed event cannot
             // strand the workflow waiting for another startup Idle.
-            if (ReferenceEquals(AcadApplication.DocumentManager.MdiActiveDocument, document))
+            var activeDocument = AcadApplication.DocumentManager.MdiActiveDocument;
+            if (activeDocument is not null && string.Equals(activeDocument.Name, document.Name, StringComparison.OrdinalIgnoreCase))
             {
                 fixtureDocumentActivated = true;
                 transitions.Add("FixtureDocumentActiveAfterOpen");

Plant3D2026/P_Rec_Annot/tests/PRecAnnot.Core.Tests/FoundationTests.cs

@@ -103,7 +103,7 @@ public sealed class FoundationTests
         var source = File.ReadAllText(Path.Combine(ProjectRoot, "src", "PRecAnnot.Plant3D2026", "FirstLimitedApplyAutomation.cs"));
         var start = source[source.IndexOf("public void Start()", StringComparison.Ordinal)..source.IndexOf("private void CompleteLifecycleProbe", StringComparison.Ordinal)];
         Assert.Contains("FixtureDocumentActiveAfterOpen", start);
-        Assert.Contains("ReferenceEquals(AcadApplication.DocumentManager.MdiActiveDocument, document)", start);
+        Assert.Contains("string.Equals(activeDocument.Name, document.Name", start);
         Assert.Contains("TryActivateProjectAndVerifyContext();", start);
     }