feat(render): implement Campaign AR and terrain fidelity

samples/AcDream.RenderPacks.NoOp/AcDream.RenderPacks.NoOp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <LangVersion>latest</LangVersion>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+  </PropertyGroup>
+  <ItemGroup>
+    <!-- The only acdream dependency available to an external render pack. -->
+    <ProjectReference Include="..\..\src\AcDream.Plugin.Abstractions\AcDream.Plugin.Abstractions.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="plugin.json" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+</Project>

samples/AcDream.RenderPacks.NoOp/NoOpRenderPack.cs

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+using AcDream.Plugin.Abstractions.Rendering;
+
+namespace AcDream.RenderPacks.NoOp;
+
+/// <summary>
+/// Minimal external render-pack entry point. It declares no resources, passes,
+/// pipeline variants, shaders, or GPU capabilities, so selecting it is a
+/// renderer no-op while still exercising discovery and atomic activation.
+/// </summary>
+public sealed class NoOpRenderPack : IRenderPackPlugin, IRenderPackAssets
+{
+    private static RenderPackDescriptor Descriptor { get; } = new(
+        "sample.no-op-render-pack",
+        "No-op Render Pack Sample",
+        new Version(1, 0, 0),
+        RenderPackApi.Current,
+        RenderPackTier.Tier1,
+        RequiredCapabilities: [],
+        OptionalCapabilities: [],
+        Resources: [],
+        Passes: [],
+        SceneReplays: [],
+        PipelineVariants: [],
+        QualityPresets:
+        [
+            new RenderQualityPreset(
+                "conformance",
+                "Conformance",
+                RequiredCapabilities: [],
+                ResourceOverrides: [],
+                SettingOverrides: [],
+                MaxResidentGpuBytes: 0,
+                MaxIncrementalGpuMillisecondsP50: 0,
+                MaxIncrementalGpuMillisecondsP99: 0,
+                MaxIncrementalCpuMillisecondsP50: 0,
+                MaxIncrementalCpuMillisecondsP99: 0),
+        ],
+        Settings: [],
+        AtmospherePolicy: null)
+    {
+        FeatureSummary = "No visual changes; exercises render-pack discovery and atomic activation.",
+    };
+
+    public void Register(IRenderPackRegistry registry)
+    {
+        ArgumentNullException.ThrowIfNull(registry);
+        registry.Register(Descriptor, this);
+    }
+
+    public Stream OpenRead(string assetKey) =>
+        throw new FileNotFoundException(
+            "The no-op conformance pack declares no assets.",
+            assetKey);
+}

samples/AcDream.RenderPacks.NoOp/packages.neutral.lock.json

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+{
+  "version": 2,
+  "dependencies": {
+    "net10.0": {
+      "acdream.plugin.abstractions": {
+        "type": "Project"
+      }
+    }
+  }
+}

samples/AcDream.RenderPacks.NoOp/plugin.json

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+{
+  "$schema": "../../docs/render-packs/plugin-manifest-v1.schema.json",
+  "id": "sample.no-op-render-pack",
+  "displayName": "No-op Render Pack Sample",
+  "version": "1.0.0",
+  "entryDll": "AcDream.RenderPacks.NoOp.dll",
+  "apiVersion": 1,
+  "dependencies": [],
+  "kinds": ["renderPack"]
+}