Add AGENTS.md with Cursor Cloud development environment instructions

[SimonBaars]

Summary

Adds AGENTS.md with Cursor Cloud specific development instructions for the CloneRefactor project.

What's included

• Build/test/run command reference table
• Non-obvious notes about pre-existing test failures, exec:java configuration, output directories, JVM config, and lack of a dedicated linter
• Instructions for running the CLI entry point directly (since mvn exec:java targets RunOnCorpus, not Main)

Environment verification

The development environment was verified end-to-end:

Check	Result
mvn clean compile	153 source files compiled successfully
mvn test	72 tests run (pre-existing: 3 failures, 54 errors — not environment-related)
mvn clean package -DskipTests	JAR built successfully
Clone detection on own source	Detected 15 clone classes, 530 cloned lines across 153 source files

Clone detection output (hello-world demo)

clone_detection_output.log

_{To show artifacts inline, enable in settings.}