chore: add Cursor cloud agent environment

.cursor/Dockerfile

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+FROM node:24-bookworm-slim
+
+ARG PNPM_VERSION=10.32.1
+ENV COREPACK_ENABLE_DOWNLOAD_PROMPT=0
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends git sudo \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN id -u ubuntu >/dev/null 2>&1 || useradd -m -s /bin/bash ubuntu \
+    && usermod -aG sudo ubuntu \
+    && echo "ubuntu ALL=(ALL) NOPASSWD:ALL" >/etc/sudoers.d/ubuntu \
+    && chmod 0440 /etc/sudoers.d/ubuntu
+
+RUN corepack enable && corepack prepare "pnpm@${PNPM_VERSION}" --activate
+
+WORKDIR /workspace
+
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
+COPY packages/cddl/package.json packages/cddl/package.json
+COPY packages/cddl2ts/package.json packages/cddl2ts/package.json
+COPY packages/cddl2java/package.json packages/cddl2java/package.json
+COPY packages/cddl2py/package.json packages/cddl2py/package.json
+
+RUN pnpm install --frozen-lockfile
+
+RUN chown -R ubuntu:ubuntu /workspace
+
+USER ubuntu

.cursor/environment.json

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+{
+  "name": "node-24-pnpm-workspace",
+  "user": "ubuntu",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": ".."
+  }
+}

AGENTS.md

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+# Cursor Cloud specific instructions
+
+- This repository defines a repo-level cloud agent environment in `.cursor/environment.json`.
+- The corresponding `.cursor/Dockerfile` pins Node 24 and pnpm 10.32.1, then preinstalls the pnpm workspace dependencies into `/workspace`.
+- You can run these commands immediately in a fresh cloud agent without a preliminary `pnpm install`:
+  - `pnpm compile`
+  - `pnpm run test:typechecks`
+- For focused Vitest runs, disable coverage so single-file or narrow test selections are not blocked by the repo's global coverage thresholds:
+  - `pnpm exec vitest --config vitest.config.ts --run --coverage.enabled=false packages/cddl/tests/parser.test.ts`