Goal

Add a small expected-output / verification note for the isolated pytest trace-store recipe in examples/README.md.

Scope

Please keep this docs-only and limited to examples/README.md unless you find an existing command in that file is wrong.

A good target section is the pytest example just before ## Public Export Flow, where the docs show:

def test_browsertrace_trace_uses_temp_store(tmp_path, monkeypatch):
    monkeypatch.setenv("BROWSERTRACE_HOME", str(tmp_path))
    ...
    assert (tmp_path / "db.sqlite").exists()

Add 2-4 sentences that tell a first-time contributor what to expect after this test/recipe works. For example:

• the isolated store should contain db.sqlite under the temporary path, not ~/.browsertrace/
• the recorded run should be named pytest isolated trace
• passing Tracer(home=tmp_path) is the safer option if the module imports BrowserTrace before setting BROWSERTRACE_HOME
• no screenshots, browser, network, or API keys are required for this recipe

Verification

Please include the exact commands you ran in the PR. A good local docs check is:

uv run --python 3.11 --extra dev pytest tests/test_metadata.py -q

If you run the example manually, mention whether you used BROWSERTRACE_HOME or Tracer(home=tmp_path).

Non-goals

• Do not change trace storage implementation.
• Do not add generated SQLite databases or trace artifacts to the repository.
• Do not change unrelated examples.