Add Cloud Agent development environment

.cursor/environment.json

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+{
+  "name": "coding-tools-mcp",
+  "install": "./.cursor/install.sh",
+  "ports": [
+    {
+      "name": "MCP HTTP server",
+      "port": 8765
+    }
+  ]
+}

.cursor/install.sh

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+#!/usr/bin/env bash
+# Idempotent Cloud Agent bootstrap for coding-tools-mcp.
+#
+# The repository is a Python >=3.11 MCP server whose canonical dev loop is
+# `python -m pip install -e ".[dev]"` followed by `make ci` (lint, typecheck,
+# unittest discovery, protocol/integration/docs/schema gates, dogfood, and
+# benchmark smokes). This script prepares that loop on the default Cursor image.
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+# 1. The compliance fixtures invoke a bare `python` (e.g. `python -m pytest`,
+#    `python repl.py`). Ubuntu ships only `python3`, so provide the alias.
+if ! command -v python >/dev/null 2>&1; then
+  sudo apt-get update -y
+  sudo apt-get install -y --no-install-recommends python-is-python3
+fi
+
+# 2. Grant the runtime's Landlock exec sandbox access to toolchain paths that
+#    live outside the system prefixes (/usr, /bin, ...) it allows by default.
+#    On the Cursor image:
+#      - Node/npm live under nvm (~/.nvm) and the agent exec daemon
+#        (/exec-daemon), so suites that shell out to `npm test` / `node --test`
+#        are otherwise blocked with LANDLOCK_READ_ROOT_BLOCKED.
+#      - Debian symlinks /usr/lib/pythonX.Y/sitecustomize.py into
+#        /etc/pythonX.Y, so on stricter Landlock kernels a sandboxed `python`
+#        fails to read it and pollutes stderr; grant the /etc python config dir.
+#    This mirrors how the project's own Dockerfile keeps the toolchain under
+#    system-readable roots. The export is placed in ~/.bashrc alongside the
+#    image's nvm init so it reaches the exec daemon that spawns the MCP server
+#    during `make test`.
+BASHRC="${HOME}/.bashrc"
+MARKER_TAG="coding-tools-mcp: allow Landlock"
+MARKER="# ${MARKER_TAG} exec/read of the nvm + exec-daemon + python toolchain"
+PY_ETC="/etc/python$(python3 -c 'import sys; print(f"{sys.version_info.major}.{sys.version_info.minor}")')"
+# Replace any previously-managed block (any marker variant) so re-runs and
+# rebuilds from an older snapshot pick up an updated value without duplicating.
+if grep -qF "$MARKER_TAG" "$BASHRC" 2>/dev/null || grep -qF 'CODING_TOOLS_MCP_EXEC_ALLOW_ROOTS' "$BASHRC" 2>/dev/null; then
+  tmp_bashrc="$(mktemp)"
+  grep -vF "$MARKER_TAG" "$BASHRC" | grep -vF 'CODING_TOOLS_MCP_EXEC_ALLOW_ROOTS' > "$tmp_bashrc" || true
+  # collapse any trailing blank lines left behind, then move back
+  sed -e :a -e '/^\n*$/{$d;N;ba}' "$tmp_bashrc" > "$BASHRC"
+  rm -f "$tmp_bashrc"
+fi
+{
+  echo ""
+  echo "$MARKER"
+  # Fixed assignment (not self-appending) so re-sourcing ~/.bashrc in nested
+  # shells keeps the value stable instead of growing on each source.
+  echo "export CODING_TOOLS_MCP_EXEC_ALLOW_ROOTS=\"/exec-daemon:\${HOME}/.nvm:${PY_ETC}\""
+} >> "$BASHRC"
+
+# 3. Install the package plus dev tooling (ruff, mypy, PyYAML, typing_extensions)
+#    in editable mode. Ubuntu 24.04's system interpreter is PEP 668 managed;
+#    this is a disposable agent VM, so install directly into it (mirrors CI's
+#    `pip install -e ".[dev]"`).
+python3 -m pip install --break-system-packages -e ".[dev]"
+
+echo "coding-tools-mcp environment ready."