Status: ready-for-agent

# 19 — DOC: Cryptography dependency + test environment note

## What to build

Document and verify test/dev environment setup for wallet crypto paths. `packages/node/meshnet_node/wallet.py` uses `cryptography`; failures occur when `.venv` lacks deps. `cryptography>=41` is already declared in `packages/node/pyproject.toml`, so this issue should focus on documenting the editable-install path and only add root/dev extras if tests still import the node wallet without installing the node package.

**Code refs:**

- `packages/node/pyproject.toml` — `cryptography>=41` (verify declared)
- `packages/node/meshnet_node/wallet.py`
- Handoff: tests fail without `cryptography`, `openai`, `langchain` in `.venv`

## Acceptance criteria

- [ ] Confirm `cryptography>=41` remains in node package deps; add to root/dev extras only if tests import wallet without node install
- [ ] Add short **Test environment** section to `docs/dev/test-env.md` (or `CONTRIBUTING.md` if created): use `.venv/Scripts/python.exe`, `pip install -e packages/node ...`, optional dep skips
- [ ] Note which tests require optional deps (`--ignore=test_openai_gateway,...`)
- [ ] No unrelated production code changes

## Blocked by

None