docs: add disclaimer to README, documentation, and release notes

Author: brunoborges

.github/workflows/notes.template

@@ -1,4 +1,6 @@
 # Installation
+
+> ⚠️ **Disclaimer:** This is an **unofficial, community-driven SDK** and is **not supported or endorsed by GitHub**. Use at your own risk.
 
 📦 [View on Maven Central](https://central.sonatype.com/artifact/${GROUP_ID}/${ARTIFACT_ID}/${VERSION})
 

README.md

@@ -5,6 +5,8 @@
 [![Java 17+](https://img.shields.io/badge/Java-17%2B-blue)](https://openjdk.org/)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
+> ⚠️ **Disclaimer:** This is an **unofficial, community-driven SDK** and is **not supported or endorsed by GitHub**. Use at your own risk.
+
 Java SDK for programmatic control of GitHub Copilot CLI.
 
 > **Note:** This SDK may change in breaking ways.

src/site/markdown/documentation.md

@@ -1,5 +1,7 @@
 # Copilot SDK for Java - Documentation
 
+> ⚠️ **Disclaimer:** This is an **unofficial, community-driven SDK** and is **not supported or endorsed by GitHub**. Use at your own risk.
+
 This document provides detailed API reference and usage examples for the Copilot SDK for Java.
 
 ## Table of Contents