Add NestPipeline: one validated engine path for all front ends

build NestJob -> resolve engine by name -> Solve -> independent
NestLayoutCheck validation -> bind placements to caller drawings.
The pipeline never commits to plates and never mutates caller items;
validation failures are returned as messages naming real drawings
(unknown-requirement placements are reported, not dropped). Console,
MCP, API and desktop Auto Nest will adopt this path in later phases.

- NestPipeline.Run(request): registry-resolved engine, unknown names
  list the registered engines; cancellation propagates untouched.
- NestPipeline.Run(engine, ...): stub/plug-in engines take the same path.
- NestResultBinder: pose semantics identical to NestResultMaterializer.
- NestLayoutCheck: Violations overload with per-requirement display names.

Tests: overlap stub -> violations w/ drawing names, no throw; ghost
placement -> violation + excluded from further checks; unknown engine
-> NotSupportedException listing engines; cancelled token -> no result;
happy path -> bound by reference, caller quantity untouched.

OpenNest.Engine/Jobs/Adapters/NestResultBinder.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using OpenNest.Geometry;
+
+namespace OpenNest.Engine.Jobs.Adapters;
+
+/// <summary>
+/// Binds one result sheet's poses to the caller's own drawings. The pose semantics match
+/// <see cref="NestResultMaterializer"/>: rotate about the snapshot origin, then translate.
+/// Placements whose requirement ID is not in the map are skipped here; the pipeline reports
+/// them as violations instead of dropping them silently.
+/// </summary>
+public static class NestResultBinder
+{
+    public static IReadOnlyList<Part> Bind(
+        NestJobPlateResult sheet,
+        IReadOnlyDictionary<string, Drawing> drawingsByPartId
+    )
+    {
+        ArgumentNullException.ThrowIfNull(sheet);
+        ArgumentNullException.ThrowIfNull(drawingsByPartId);
+        var parts = new List<Part>(sheet.Placements.Count);
+        foreach (var pose in sheet.Placements)
+        {
+            if (!drawingsByPartId.TryGetValue(pose.PartId, out var drawing))
+                continue;
+            var part = new Part(drawing);
+            part.Rotate(pose.Rotation);
+            part.Location = new Vector(pose.X, pose.Y);
+            part.UpdateBounds();
+            parts.Add(part);
+        }
+        return parts;
+    }
+}