chore: add Cloud Agent development environment (JDK 16 + Maven)

.cursor/Dockerfile

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+# Base image bundles Maven 3.8.5 and Eclipse Temurin JDK 16, matching the
+# project's Java 16 compiler target and the JDK 16 used by the GitHub Actions CI.
+# JDK 16 is required because JaCoCo 0.8.7 (used for coverage) does not support
+# bytecode from newer JDKs such as 21.
+FROM maven:3.8.5-eclipse-temurin-16
+
+# git and curl are handy for source checkout and general tooling in Cloud Agents.
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends git curl ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Run as a non-root user matching Cloud Agent conventions.
+RUN groupadd -g 1000 ubuntu \
+    && useradd -m -u 1000 -g 1000 -s /bin/bash ubuntu
+
+USER ubuntu
+WORKDIR /home/ubuntu

.cursor/environment.json

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+{
+    "name": "veryfi-java",
+    "user": "ubuntu",
+    "build": {
+        "dockerfile": "Dockerfile"
+    },
+    "install": "mvn -B -ntp -DskipTests package"
+}