feat: add p-rec-annot Plant component geometry adapter

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

@@ -87,6 +87,20 @@ public sealed record GeometrySnapshot
     public double? Elevation { get; init; }
 }
 
+// Platform-neutral result of the legacy GetComponentGeometry contract.  The
+// Plant adapter is responsible for reading Parts/Pipes and normalising units;
+// consumers do not take a dependency on Autodesk managed assemblies.
+public sealed record ComponentGeometryDefinition(
+    string Kind,
+    IReadOnlyDictionary<string, string> Parameters,
+    Bounds3Dto Bounds,
+    bool ImperialDimensions);
+public sealed record ComponentGeometryReadResult(bool Success, ComponentGeometryDefinition? Geometry, string? FailureCode = null);
+public interface IPlantComponentGeometryReader
+{
+    ComponentGeometryReadResult Read(string stableEntityId, bool convertToMetric);
+}
+
 public sealed record OrthoViewportInfo
 {
     public required string Id { get; init; }