Check in poetry.lock for poetry_simple_math and mark poetry_broken_simple_math with network/slow

[Copilot]

test_existing_test_packages scans poetry fixtures in auto mode, triggering poetry install when poetry.lock is absent. This causes network/slow operations even when users filter those markers.

Changes:

• poetry_simple_math: Generated and checked in poetry.lock with pinned dependencies (requests 2.26.0, numpy 2.0.0). Scanning no longer triggers poetry install.

• poetry_broken_simple_math: Applied network and slow markers via pytest.param(). This fixture has an intentionally malformed pyproject.toml that cannot generate a valid lock file, so poetry install is unavoidable.

EXISTING_PACKAGES = [
    "python_simple_math",
    "poetry_simple_math",
    pytest.param(
        "poetry_broken_simple_math",
        marks=[pytest.mark.network, pytest.mark.slow]
    ),
    # ...
]

Test collection now respects marker filtering: -m "not network and not slow" skips poetry_broken_simple_math (5/6 collected), while unfiltered collection includes all 6 packages.

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High-level PR Summary

This is a work-in-progress PR created to address feedback from PR #45 regarding testing improvements in a poetry update. The PR is currently empty with no file changes, as it was just opened to track the feedback implementation work. It is intended to merge into PR #45 rather than directly into the main branch.

⏱️ Estimated Review Time: 5-15 minutes

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