Add Cursor Cloud setup notes

AGENTS.md

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+
+# Agent instructions
+
+## Cursor Cloud specific instructions
+
+- This is a Java 21 / Maven monorepo. The core end-to-end development stack is documented in `packaging/src/docker/README.md` and runs Postgres, Hive Metastore, and HiveServer2 from `packaging/src/docker/docker-compose.yml`.
+- In Cursor Cloud, Docker commands may require `sudo` even when the Docker CLI is installed. If the daemon is not running, start it in a persistent shell/tmux session before using Compose.
+- The Docker Compose stack requires `HIVE_VERSION` and `POSTGRES_LOCAL_PATH`; the VM startup update script refreshes the PostgreSQL JDBC artifact, so `POSTGRES_LOCAL_PATH` can be derived from Maven's local repository as shown in `packaging/src/docker/README.md`.
+- The optional LLAP, Ozone, Polaris, Gravitino, Kubernetes operator, and storage-handler stacks are separate integration surfaces; keep them opt-in unless the task explicitly targets those flows.