ci(release): bundle and verify external nesting engines

scripts/ReleaseSmoke/Program.cs

@@ -0,0 +1,40 @@
+using System.Reflection;
+using System.Runtime.Loader;
+using System.Text.Json;
+
+try
+{
+    if (args.Length != 1)
+        throw new ArgumentException("Usage: ReleaseSmoke <extracted-package-directory>");
+
+    var package = Path.GetFullPath(args[0]);
+    // No project references: resolve against the extracted release, never the build tree.
+    AssemblyLoadContext.Default.Resolving += (_, name) =>
+    {
+        var path = Path.Combine(package, name.Name + ".dll");
+        return File.Exists(path) ? AssemblyLoadContext.Default.LoadFromAssemblyPath(path) : null;
+    };
+
+    var engineAssembly = Assembly.LoadFrom(Path.Combine(package, "OpenNest.Engine.dll"));
+    var registry = engineAssembly.GetType("OpenNest.Engine.Jobs.NestingEngineRegistry", true)!;
+    var engineDirectory = Path.Combine(package, "Engines");
+    registry.GetMethod("LoadPlugins")!.Invoke(null, [engineDirectory]);
+    using var manifest = JsonDocument.Parse(File.ReadAllText(Path.Combine(engineDirectory, "manifest.json")));
+    foreach (var entry in manifest.RootElement.GetProperty("engines").EnumerateArray())
+    {
+        var name = entry.GetProperty("registryName").GetString()!;
+        var expected = Path.Combine(engineDirectory, entry.GetProperty("project").GetString() + ".dll");
+        if (!File.Exists(expected))
+            throw new FileNotFoundException("Required engine missing", expected);
+        var engine = registry.GetMethod("Create")!.Invoke(null, [name])!;
+        if (!string.Equals(engine.GetType().Assembly.Location, expected, StringComparison.OrdinalIgnoreCase))
+            throw new InvalidOperationException($"Engine {name} was not loaded from the release package.");
+        Console.WriteLine($"PASS: {name} loaded and instantiated from {expected}");
+    }
+    return 0;
+}
+catch (Exception exception)
+{
+    Console.Error.WriteLine(exception);
+    return 1;
+}

scripts/ReleaseSmoke/ReleaseSmoke.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+</Project>