Add opt-in AppHost Server v2 to the CLI bundle

docs/specs/appmodel.md

@@ -1,6 +1,7 @@
 # Aspire Resource Model: Concepts, Design, and Authoring Guidance
 > **Audience** – Aspire integrators, advanced users, and contributors who are defining custom resource types, implementing publishers, or working across both runtime and publish workflows.  
 > This documentation's focus is on hosting integrations *NOT* client integrations.
+> For the ATS-native model being explored in the native hosting proof of concept, see [App Model v2](appmodelv2.md). That document describes proposed contracts, not supported APIs.
 > *Just getting started? Jump straight to [Quick Start](#quick-start) and come back later for the deep‑dive.*
 
 ---

playground/NativeHosting/.gitignore

@@ -0,0 +1,4 @@
+generated/
+compatible-generated/
+compatible-projection.mts
+compatible-projection.mjs

playground/NativeHosting/Ats/IntegrationContracts.cs

@@ -0,0 +1,43 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Aspire.Hosting;
+
+namespace NativeHosting;
+
+// Only scanned offline. These capabilities are implemented by a registered
+// TypeScript integration host, never by these CLR declarations.
+public static class IntegrationContracts
+{
+    /// <summary>Adds an authenticated Redis service with a session data volume.</summary>
+    [AspireExport]
+    public static NativeResource AddRedis(this NativeBuilder builder, string name) => throw new NotSupportedException();
+
+    /// <summary>Adds an authenticated PostgreSQL server with a session data volume.</summary>
+    [AspireExport]
+    public static NativeResource AddPostgres(this NativeBuilder builder, string name) => throw new NotSupportedException();
+
+    /// <summary>Adds and initializes a logical database under a PostgreSQL server.</summary>
+    [AspireExport]
+    public static NativeResource AddDatabase(this NativeResource server, string name, string databaseName) => throw new NotSupportedException();
+
+    /// <summary>Adds a Nuxt workload referencing a Redis connection property.</summary>
+    [AspireExport]
+    public static NativeResource AddNuxt(this NativeBuilder builder, string name, string directory, NativeResource cache) => throw new NotSupportedException();
+
+    /// <summary>Adds a run-only tunnel port with an external CLI executable owner.</summary>
+    [AspireExport]
+    public static NativeResource AddDevTunnel(this NativeBuilder builder, string name, NativeResource target, string directory, bool allowAnonymous) => throw new NotSupportedException();
+
+    /// <summary>Executes a bounded authenticated Redis operation.</summary>
+    [AspireExport]
+    public static Task<string> RedisCommand(this NativeResource resource, string operation, string key, string value, bool wrongPassword, CancellationToken cancellationToken) => throw new NotSupportedException();
+
+    /// <summary>Executes a bounded authenticated query against a database child.</summary>
+    [AspireExport]
+    public static Task<string> Query(this NativeResource resource, string sql, bool wrongPassword, CancellationToken cancellationToken) => throw new NotSupportedException();
+
+    /// <summary>Stops integration controllers and releases session-owned external state.</summary>
+    [AspireExport]
+    public static Task<bool> ReleaseGraph(this NativeBuilder builder, string[] callbackIds, CancellationToken cancellationToken) => throw new NotSupportedException();
+}