[codex] assert scalar scale predicates are selective

[tobyhede]

Summary

• add row-count assertions to scalar scale-preference matrix predicates
• reuse each natural/extractor predicate for both EXPLAIN index checks and count(*) selectivity checks
• leave unrelated untracked docs out of the commit

Validation

• cargo fmt --check
• attempted cargo test --features bench --test encrypted_domain -- --list, but the run was interrupted before completion during the long link step

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch eql_v3_scale_index_engagement_expand

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