Using the GitHub Copilot SDK for Java

What this post added

Introduces the GitHub Copilot SDK for Java, a framework-agnostic client library for server-side Java applications to drive AI. Details how to use the SDK to create agent sessions, register tools using `@CopilotTool` annotations and inline lambdas, send prompts, and receive structured responses. Explains the use of virtual threads for agent processing and Jakarta WebSocket for real-time UI updates. Provides a Maven dependency and configuration for the annotation processor. Demonstrates a sample Jakarta EE 11 application with a real-estate lead-management agent pipeline.