Load a Hyphenated Sibling Check From One Shared Helper #532

Summary

Three files in checks/ each define the same five-line helper, which loads a sibling script by path because a hyphenated file name cannot be imported by name:

• checks/fuzz-media-parsers.py, load
• checks/tests/test_check_media_metadata.py, load
• checks/check-csp.py, load_sibling, the third copy, which the CSP gate added to reuse check-url-parity.py's site_origin

A defect class seen a second time gets one primitive, per GOVERNANCE.md "Design Before Code". Each copy is the import bootstrap itself, so none can be reused from the others. The consolidation is a small importable module in checks/, such as checks/sibling.py, that all three import by name. A script run as checks/<name>.py has checks/ on its path, and the test suite runs from checks/, so both reach it.

Done

One definition, all three sites on it, and ruff, mypy, and the suite passing under checks/.

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