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Phase 4 (5 of 9 cruft sites obliterated): OBLITERATED wrappers: 1. _reread_file_items (4 callers in _send_gemini + _send_gemini_cli + 2 others) 2. _list_anthropic_models (1 caller in list_models) 3. _list_gemini_models (1 caller in list_models) 4. _extract_gemini_thoughts (1 caller in _send_gemini) 5. _list_minimax_models (2 callers in _set_minimax_provider_result + set_provider) Migration: each caller now uses the _result sibling directly with .ok check + .data extraction. The Result[T] error context (structured ErrorInfo) is now propagated instead of dropped. _send_gemini gets .data with explicit .ok check. Updated tests to assert OBLITERATED state (5 sub-track 5 tests inverted from '_legacy_preserved' to '_legacy_obliterated'): - tests/test_baseline_result.py: test_phase9_redo_modules_import_cleanly - tests/tier2/phase10_invariant_test.py: _list_gemini_models removed from list - tests/tier2/phase10_site1_test.py: _legacy_unchanged -> _legacy_obliterated - tests/tier2/phase11_invariant_test.py: _extract/_list_minimax moved to obliterated - tests/tier2/phase11_sites78_test.py: _legacy_preserved -> _legacy_obliterated - tests/tier2/phase12_invariant_test.py: _list_anthropic moved to obliterated - tests/tier2/phase12_site4_test.py: _legacy_preserved -> _legacy_obliterated - tests/test_gemini_thinking_format.py: helper uses _result directly - tests/test_cruft_removal.py: 5 new obliterated-wrappers invariant tests Test result: 122/122 pass (31 baseline + 16 heuristic + 9 cruft + 5 thinking + 61 tier2). Audit gate: src/ai_client.py --strict exits 0 (no new violations introduced). Wrapper count: 9 -> 3 (Phase 5-6 remaining: rag_engine 1, gui_2 2).