Add Game Engine and Language section to Platform Compatibility

Documents minimum supported versions for Standalone C++ (C++20), Unity
(2021.3), and Unreal Engine (5.5), with callouts for the PS4/PS5 C++17
carve-out and the pre-1.9 C++17 minimum. Removes the duplicate PS
callout from the C++ getting-started guide now that it lives in the
shared Platform Compatibility page.

Author: markmandel

developers/discord-social-sdk/core-concepts/platform-compatibility.mdx

@@ -9,6 +9,31 @@ import SonyCallout from '/snippets/discord-social-sdk/callouts/sony.mdx';
 You can find instructions on how to download the SDK for each platform in the [Getting Started](/developers/discord-social-sdk/getting-started) guide.
 </Info>
 
+---
+
+## Game Engine and Language
+
+The Discord Social SDK supports the following game engines and language environments:
+
+| Integration    | Minimum Supported Version |
+|----------------|---------------------------|
+| Standalone C++ | C++20                     |
+| Unity          | 2021.3                    |
+| Unreal Engine  | 5.5                       |
+
+<Info>
+    **PlayStation 4 / PS5 exception:** If you're targeting PlayStation 4, or PlayStation 5 with a PS5 SDK older than
+    13.000, the Discord Social SDK still supports C++17. All other platforms require C++20.
+</Info>
+
+<Info>
+    Prior to Social SDK release 1.9, C++17 is the minimum supported version.
+</Info>
+
+---
+
+## Platforms
+
 The Discord Social SDK is available for the following platforms:
 
 | Platform         | Minimum Supported Version | Support Level       | Standalone C++ | Unreal Engine | Unity |
@@ -62,6 +87,7 @@ Configure authentication, explore features, and get started with setup:
 
 ## Change Log
 
-| Date          | Changes         |
-|---------------|-----------------|
-| July 21, 2025 | initial release |
+| Date          | Changes                                 |
+|---------------|-----------------------------------------|
+| May 20, 2026  | Added Game Engine and Language section. |
+| July 21, 2025 | initial release                         |

developers/discord-social-sdk/getting-started/using-c++.mdx

@@ -26,10 +26,6 @@ We are going to make a simple C++ console application for this guide. Make sure
 - C++ Compiler and Build System that supports [C++20](https://en.cppreference.com/w/cpp/20) or greater.
 - A network connection that can access Discord's API endpoints.
 
-<Info>
-**PlayStation 4 / PS5 exception:** If you're targeting PlayStation 4, or PlayStation 5 with a PS5 SDK older than 13.000, the Discord Social SDK still supports C++17. All other platforms (Windows, macOS, Linux, iOS, PS5 with SDK 13.000+) require C++20.
-</Info>
-
 Let's walk through the steps in detail.
 
 ---
@@ -976,10 +972,10 @@ import {InboxIcon} from '/snippets/icons/InboxIcon.jsx'
 
 ## Change Log
 
-| Date           | Changes                                |
-|----------------|----------------------------------------|
-| May 20, 2026   | Updated required C++ standard to C++20 |
-| March 17, 2025 | initial release                        |
+| Date           | Changes                                                 |
+|----------------|---------------------------------------------------------|
+| May 20, 2026   | Updated required C++ standard to C++20 with 1.9 release |
+| March 17, 2025 | initial release                                         |
 
 {/* Autogenerated Reference Links */}
 [`Activity`]: https://discord.com/developers/docs/social-sdk/classdiscordpp_1_1Activity.html#ae793d9adbe16fef402b859ba02bee682