Context

BrowserTrace examples and tests often set BROWSERTRACE_HOME to a temporary directory so demo traces do not pollute ~/.browsertrace/. This pattern is useful for contributors and teams adding BrowserTrace to existing test suites, but it is not documented as a small copyable recipe yet.

Task

Add a short pytest-focused recipe to the examples docs. Keep it small and practical: show how to isolate trace storage with tmp_path and monkeypatch.setenv("BROWSERTRACE_HOME", str(tmp_path)), then create or run a trace without a browser, network, or API key.

Acceptance criteria

• examples/README.md includes a compact pytest recipe for isolated BrowserTrace storage.
• The recipe uses BROWSERTRACE_HOME with a temporary directory.
• The text does not require API keys, hosted browser accounts, or network access.
• Existing GitHub-tag install and uvx commands stay on v0.1.14 while PyPI is pending.
• Run uv run --python 3.11 --extra dev pytest -q before opening a PR.