feat(render): implement Campaign AR and terrain fidelity

tests/AcDream.Core.Tests/Plugins/PluginLoaderTests.cs

@@ -1,6 +1,7 @@
 using AcDream.Core.Plugins;
 using AcDream.Core.Selection;
 using AcDream.Plugin.Abstractions;
+using AcDream.Plugin.Abstractions.Rendering;
 
 namespace AcDream.Core.Tests.Plugins;
 
@@ -69,6 +70,36 @@ public class PluginLoaderTests
         }
     }
 
+    private sealed class RecordingRenderPackRegistry : IRenderPackRegistry, IDisposable
+    {
+        private readonly List<Registration> _registrations = [];
+
+        public int ActiveCount => _registrations.Count(static item => item.Active);
+        public RenderPackDescriptor? Descriptor { get; private set; }
+
+        public IDisposable Register(
+            RenderPackDescriptor descriptor,
+            IRenderPackAssets assets)
+        {
+            Descriptor = descriptor;
+            var registration = new Registration();
+            _registrations.Add(registration);
+            return registration;
+        }
+
+        public void Dispose()
+        {
+            foreach (Registration registration in _registrations)
+                registration.Dispose();
+        }
+
+        private sealed class Registration : IDisposable
+        {
+            public bool Active { get; private set; } = true;
+            public void Dispose() => Active = false;
+        }
+    }
+
     [Fact]
     public void Load_FixtureDll_InstantiatesPluginAndCallsInitialize()
     {
@@ -89,13 +120,42 @@ public class PluginLoaderTests
             manifest: manifest,
             host: host);
 
-        Assert.True(loaded.Success);
+        Assert.True(loaded.Success, loaded.Error?.ToString());
         Assert.NotNull(loaded.Plugin);
         Assert.Equal("HelloPlugin", loaded.Plugin!.GetType().Name);
         loaded.Plugin.Disable();
         loaded.LoadContext!.Unload();
     }
 
+    [Fact]
+    public void Load_RenderPackOnlyFixture_RegistersWithoutGameplayEntrypointRequirement()
+    {
+        string dllPath = FixturePluginPath();
+        var host = new StubHost();
+        using var registry = new RecordingRenderPackRegistry();
+        var manifest = new PluginManifest(
+            Id: "acdream.test.render-pack",
+            DisplayName: "Render pack",
+            Version: "1.0.0",
+            EntryDll: Path.GetFileName(dllPath),
+            ApiVersion: 1,
+            Dependencies: [],
+            Kinds: [PluginKind.RenderPack]);
+
+        LoadedPlugin loaded = PluginLoader.Load(
+            Path.GetDirectoryName(dllPath)!,
+            manifest,
+            host,
+            registry);
+
+        Assert.True(loaded.Success, loaded.Error?.ToString());
+        Assert.Null(loaded.Plugin);
+        Assert.NotNull(loaded.RenderPackPlugin);
+        Assert.Equal(1, registry.ActiveCount);
+        Assert.Equal("acdream.test.noop-pack", registry.Descriptor?.Id);
+        loaded.LoadContext!.Unload();
+    }
+
     [Fact]
     public void Load_UnsupportedApiVersion_IsRefusedBeforeAnyCodeLoads()
     {