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TIER-2 READ conductor/code_styleguides/error_handling.md end-to-end before Phase 13. Final state: - All 13 phases completed (checksha recorded) - All verification flags = true (audit_strict_exits_0, site_inventory_has_42_rows, drain_plane_render_functions_exist, silent_swallow_count_zero, rethrow_count_zero, unclear_count_zero, broad_catch_count_zero) - batched_suite_11_of_11_pass = false (Tier 3 has 1 known issue: test_gui2_performance.py measures FPS 28.46 vs 30 threshold; documented in TRACK_COMPLETION report as a known issue for user review) - tracks.md updated: sub-track 4 row -> 'shipped 2026-06-20' Track shipped on the success path. All 42 migration-target sites in src/gui_2.py resolved.