fix: retain prepared Ortho context for script PXP-OA

Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/EntryPoint.cs

@@ -77,7 +77,9 @@ public sealed class EntryPoint : IExtensionApplication
             // document lags behind MDI activation. Bind the planner to the
             // command document captured above, which is also the observer's
             // fixture identity.
-            var context = new PlantRuntimeContextReader().ReadCurrentContext(document);
+            var context = ScriptDrivenFirstApplyAutomation.TryGetPreparedContext(document, out var scriptContext)
+                ? scriptContext
+                : new PlantRuntimeContextReader().ReadCurrentContext(document);
             var details = new Dictionary<string, object?>
             {
                 ["ExecutionMode"] = mode.ToString(),
@@ -113,7 +115,8 @@ public sealed class EntryPoint : IExtensionApplication
             var applyPermit = (mode == PRecAnnotExecutionMode.Apply || hasLimitedApplyPermit) && document is not null
                 ? FirstLimitedApplyPermitReader.ReadFor(document)
                 : null;
-            var automationTarget = FirstLimitedApplyAutomationCoordinator.SelectedTargetSnapshotId;
+            var automationTarget = ScriptDrivenFirstApplyAutomation.SelectedTargetSnapshotId
+                ?? FirstLimitedApplyAutomationCoordinator.SelectedTargetSnapshotId;
             var limitedTarget = applyPermit?.TargetSnapshotId ?? automationTarget;
             if (mode == PRecAnnotExecutionMode.Apply && context.Viewports.Count != 1)
                 throw new InvalidOperationException("APPLY_REQUIRES_EXACTLY_ONE_VIEWPORT");

Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/ScriptDrivenFirstApplyAutomation.cs

@@ -6,6 +6,7 @@ using Autodesk.AutoCAD.DatabaseServices;
 using Autodesk.AutoCAD.Runtime;
 using Autodesk.ProcessPower.PlantInstance;
 using Autodesk.ProcessPower.ProjectManager;
+using PRecAnnot.Abstractions;
 using AcadApplication = Autodesk.AutoCAD.ApplicationServices.Application;
 
 namespace PRecAnnot.Plant3D2026;
@@ -26,6 +27,11 @@ internal static class ScriptDrivenFirstApplyAutomation
     private static readonly List<AutomationSentinelEvidence> sentinels = [];
     private static readonly List<AutomationCommandCorrelationEvidence> correlations = [];
     private static PxpOaDiscoveryEvidence? discovery;
+    // Plant's implicit current-document lookup can lag between script commands.
+    // PREPARE has already proved this immutable context belongs to the live fixture;
+    // retain it for the two immediately following public PXP-OA commands only.
+    private static PlantRuntimeContext? preparedContext;
+    private static string? selectedTargetSnapshotId;
     private static bool prepared;
     private static bool terminal;
 
@@ -53,6 +59,12 @@ internal static class ScriptDrivenFirstApplyAutomation
             var context = new PlantRuntimeContextReader().ReadCurrentContext(fixture);
             if (!context.HasPlantProject || !context.IsOrthoDrawing || context.Viewports.Count != 1)
                 throw new InvalidOperationException("AUTOMATION_ORTHO_CONTEXT_INVALID");
+            var candidates = new PlantObjectReader().ReadObjects(context.Viewports.Single(), CancellationToken.None)
+                .Where(x => string.Equals(x.ObjectClass, "Pipe", StringComparison.OrdinalIgnoreCase) && x.MembershipStatus == ViewMembershipStatus.Resolved && x.Geometry.PaperPosition is not null)
+                .Select(x => x.SnapshotId).OrderBy(x => x, StringComparer.Ordinal).ToArray();
+            if (candidates.Length == 0) throw new InvalidOperationException("AUTOMATION_NO_ELIGIBLE_CANDIDATE");
+            preparedContext = context;
+            selectedTargetSnapshotId = candidates[0];
             dbmodBaseline = Dbmod();
             baseline = Counts(database);
             prepared = true;
@@ -81,6 +93,18 @@ internal static class ScriptDrivenFirstApplyAutomation
         runs[^1] = last with { PlanId = planId, Candidates = candidates, View = view, Create = create, Skip = skip, SourceRows = sourceRows, MembershipResolved = membershipResolved };
     }
 
+    internal static bool TryGetPreparedContext(Document? commandDocument, out PlantRuntimeContext context)
+    {
+        context = null!;
+        if (!prepared || terminal || fixture is null || preparedContext is null || commandDocument is null || config is null) return false;
+        if (!SamePath(commandDocument.Name, config.OrthoDrawingPath) || !SamePath(fixture.Name, config.OrthoDrawingPath)) return false;
+        if (commandDocument.Database is null || database is null || !SamePath(commandDocument.Database.Filename, database.Filename)) return false;
+        context = preparedContext;
+        return true;
+    }
+
+    internal static string? SelectedTargetSnapshotId => prepared && !terminal ? selectedTargetSnapshotId : null;
+
     internal static void FinalizePreview()
     {
         try
@@ -149,7 +173,12 @@ internal static class ScriptDrivenFirstApplyAutomation
     }
     private static void Guard(Action action) { try { if (!terminal) action(); } catch (System.Exception ex) { Fail("AUTOMATION_EVENT_HANDLER_FAILED", ex); } }
     private static void Fail(string code, System.Exception exception) { if (terminal) return; terminal = true; transitions.Add("Failed:" + code); try { Write(false, code + ":" + exception); } finally { Unsubscribe(); } }
-    private static void Unsubscribe() { if (fixture is null) return; try { fixture.CommandWillStart -= OnWillStart; fixture.CommandEnded -= OnEnded; fixture.CommandFailed -= OnFailed; fixture.CommandCancelled -= OnCancelled; } catch { } }
+    private static void Unsubscribe()
+    {
+        if (fixture is not null) try { fixture.CommandWillStart -= OnWillStart; fixture.CommandEnded -= OnEnded; fixture.CommandFailed -= OnFailed; fixture.CommandCancelled -= OnCancelled; } catch { }
+        preparedContext = null;
+        selectedTargetSnapshotId = null;
+    }
     private static int? Dbmod() { try { return Convert.ToInt32(AcadApplication.GetSystemVariable("DBMOD")); } catch { return null; } }
     private static AutomationEntityCounts Counts(Database db)
     {

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

@@ -34,4 +34,6 @@ public sealed class PxpOaRegistrationTests
     [Fact] public void Observer_RecordsExactlyTwoSequentialRuns() => Assert.Contains("runs.Count < 2", Observer);
     [Fact] public void Finalize_ReportsMissingPlanSeparatelyFromMissingRuns() => Assert.True(Observer.IndexOf("AUTOMATION_EXPECTS_EXACTLY_TWO_PXP_OA", StringComparison.Ordinal) < Observer.IndexOf("AUTOMATION_PLAN_IDS_DIFFER", StringComparison.Ordinal));
     [Fact] public void ScriptDrivenPxpOa_BindsPlantContextToCommandDocument() => Assert.Contains("ReadCurrentContext(document)", Entry);
+    [Fact] public void ScriptDrivenPxpOa_UsesPreparedFixtureContextBeforeImplicitLookup() => Assert.Contains("TryGetPreparedContext(document, out var scriptContext)", Entry);
+    [Fact] public void ScriptDrivenPrepare_SelectsCanonicalTargetAndRetainsReadOnlyContext() { Assert.Contains("preparedContext = context", Observer); Assert.Contains("selectedTargetSnapshotId = candidates[0]", Observer); }
 }