chore: add Cloud Agent development environment config

[Abhishek Patil (abhishek-pattern)]

Summary

Adds a .cursor/environment.json so Cloud Agents get a working development environment for ds-platform-utils out of the box.

The project is a Python library managed with uv (Python 3.10, pinned via .python-version). The environment config installs uv and runs uv sync to create the virtualenv from uv.lock, matching the CI workflow (astral-sh/setup-uv + uv).

{
  "name": "ds-platform-utils",
  "install": "curl -LsSf https://astral.sh/uv/install.sh | sh && \"$HOME/.local/bin/uv\" sync"
}

No start/terminals are needed — this is a library, not a long-running service.

Validation (on this VM)

Check	Result
uv sync (Python 3.10.21)	Passed
Install idempotence	Passed (re-ran with no changes)
uv run poe test	91 passed; 6 failed + 7 errored — all require live Snowflake/Outerbounds credentials (external service), which CI supplies via OIDC
SKIP=no-commit-to-branch uv run poe lint	All ruff/pre-commit hooks passed
uv build --wheel	Built ds_platform_utils-0.6.1-py2.py3-none-any.whl
import ds_platform_utils + submodules	Passed

The remaining test failures are not environment issues: they call get_snowflake_connection(...) which needs OBP_INTEGRATIONS_URL / Outerbounds service-principal auth. CI provides these via outerbounds service-principal-configure --github-actions.