feat: add first limited Pipe Apply preflight

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

@@ -183,6 +183,30 @@ public interface IAnnotationPlanBuilder { AnnotationPlan Build(AnnotationPlannin
 public enum PRecAnnotExecutionMode { Smoke, DryRun, Apply }
 public interface IRuntimeWriteGuard { void EnsureWriteAllowed(string operation); }
 
+public sealed record CreatePipeAnnotationOperation
+{
+    public required string OperationId { get; init; }
+    public required string SourceObjectStableKey { get; init; }
+    public required string ViewStableKey { get; init; }
+    public required string RuleId { get; init; }
+    public required AnnotationPoint Placement { get; init; }
+    public required string DuplicateKey { get; init; }
+}
+
+public sealed record FirstLimitedApplyPermit
+{
+    public required string FixtureMarker { get; init; }
+    public required bool AllowApply { get; init; }
+    public required string TargetSnapshotId { get; init; }
+    public required string ExpectedPlanId { get; init; }
+}
+
+public sealed record FirstLimitedApplyPreflight
+{
+    public required string PlanId { get; init; }
+    public required CreatePipeAnnotationOperation Operation { get; init; }
+}
+
 public sealed record OrthoViewportRef(string DrawingId, string ViewportId);
 
 public sealed record PlantObjectData