The adaptive scraping feature relies on SQLiteStorageSystem to persist
and relocate elements, but the existing tests only verified object
creation — not the actual save/retrieve workflow. This adds:
- _get_base_url: None, empty, valid URL, and case-normalization paths
- _get_hash: determinism, uniqueness, strip/lowercase, length suffix
- save/retrieve round-trip: basic, overwrite (upsert), nonexistent key
- URL-based isolation between different websites
- element_to_dict: with/without text, attributes, whitespace filtering
- _get_element_path: nested and root element paths
- Thread safety: 20 concurrent saves with result verification
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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