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TIER-2 READ conductor/code_styleguides/error_handling.md end-to-end before Phase 13. End-of-track report for result_migration_gui_2_20260619. 81 atomic commits across 13 phases. All 42 migration-target sites in src/gui_2.py resolved: - 25 INTERNAL_BROAD_CATCH sites migrated to Result[T] (Phases 3-5, 7, 8) - 13 INTERNAL_SILENT_SWALLOW sites migrated to Result[T] (Phase 10) - 2 INTERNAL_RETHROW sites reclassified as INTERNAL_PROGRAMMER_RAISE via new audit heuristic (Phase 11) - 2 UNCLEAR sites reclassified as INTERNAL_COMPLIANT via new audit heuristic for lazy-loading sentinel fallback (Phase 12) Drain plane wired: 3 new module-level render functions + 3 App class delegation wrappers (Phase 2). Tests: 114/114 pass across tests/test_gui_2_result.py and tests/test_audit_heuristics.py. Tier 1 + Tier 2 of batched suite: 10/10 sub-tiers PASS. Tier 3 (live_gui): 1 known issue (test_gui2_performance.py measures 28.46 FPS vs 30 threshold; documented in the report). State.toml updated: all 13 phases marked completed.