feat: resolve Ortho viewport membership from confirmed evidence

Plant3D2026/P_Rec_Annot/src/PRecAnnot.Abstractions/Contracts.cs

@@ -64,6 +64,15 @@ public sealed record PlantObjectSnapshot
 
 public enum ViewMembershipStatus { NotResolved, Resolved, PartiallyResolved, ObjectOutsideView, Unsupported, Failed }
 
+public sealed record SourceObjectViewportMembership
+{
+    public required string SourceObjectStableKey { get; init; }
+    public required string ViewStableKey { get; init; }
+    public required ViewMembershipStatus Status { get; init; }
+    public IReadOnlyList<string> EvidenceCodes { get; init; } = Array.Empty<string>();
+    public string? ReasonCode { get; init; }
+}
+
 public sealed record PlantRuntimeContext
 {
     public bool HasActiveDocument { get; init; }