TIER-2 READ conductor/code_styleguides/error_handling.md end-to-end before Phase 6: re-read Pattern 3 (Intentional app termination, lines 409-419), cross-thread safety section (lines 244-251), and thread-safe Result accumulation guidance. Phase 6 covers signal-handler category sites; the audit shows 0 INTERNAL_BROAD_CATCH sites in this category in src/gui_2.py (the inventory classifies signal-handler try/except under other categories — Phase 6 has no sites in this track).
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