chore(env): add Cloud Agent development environment for dyro

.cursor/environment.json

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+{
+  "name": "DyroEngineeringFlow (dyro)",
+  "install": "bash .cursor/install.sh"
+}

.cursor/install.sh

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+#!/usr/bin/env bash
+# Idempotent Cloud Agent bootstrap for DyroEngineeringFlow (the `dyro` CLI).
+#
+# Mirrors the toolchain the CI workflow (.github/workflows/ci.yml) relies on:
+# uv-managed Python + a locked `uv sync`, plus the TypeScript interop runner deps.
+set -euo pipefail
+
+# uv is the project package/environment manager (see uv.lock + CI). Install once;
+# it lands in ~/.local/bin, which is already on the login-shell PATH.
+if ! command -v uv >/dev/null 2>&1; then
+  curl -LsSf https://astral.sh/uv/install.sh | sh
+fi
+export PATH="$HOME/.local/bin:$PATH"
+
+# Provision a uv-managed CPython so venv creation and `python -m build`
+# isolation do not depend on the base image shipping python3.x-venv.
+uv python install 3.12
+
+# Fail fast if uv.lock has drifted from pyproject.toml, then install the locked
+# project with all extras + dev tools (ruff / build / twine) into .venv.
+uv lock --check
+uv sync --locked --all-extras --dev --python-preference only-managed
+
+# Optional TypeScript protocol interop reference runner (CI job: typescript-interop).
+if command -v npm >/dev/null 2>&1; then
+  ( cd examples/typescript-runner && npm ci )
+fi
+
+echo "dyro environment ready: $(uv run dyro --version)"