feat: delete thin facade pass-throughs and break service→shim circular imports (RFC #20)#27

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longieirl merged 7 commits intomainfrom

feat/rfc-20-delete-facade-passthroughs

Mar 24, 2026

Commits on Mar 24, 2026

refactor(20-01): break service→shim circular imports in _classify_row_type
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refactor(20-02): delete three thin facade pass-throughs; rewire shim to service singletons
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test(20-02): add facade-deletion guard and singleton reuse test
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style: apply black formatting to RFC #20 modified files
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style: fix isort import order in RFC #20 modified files
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style: consolidate extraction_params imports to fix isort instability
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fix: add missing type annotation for has_column_type required_types param
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