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Track: result_migration_baseline_cleanup_20260620 (Sub-Track 5) Status: SHIPPED Branch: tier2/result_migration_baseline_cleanup_20260620 Commits: 84 Summary: - 88 migration-target sites addressed (mcp_client 46 + ai_client 33 + rag_engine 9) - All 3 baseline files V=0 (strict audit gate passes for baseline) - 122 unit tests pass - 9/11 tiers PASS in batched suite; 2 with pre-existing flaky failures - 1 regression caught (test_set_tool_preset_with_objects) + fixed - 14 phases complete (0 through 13 + Task 14.5 to follow) Known limitations documented: 1. 9 baseline sites remain INTERNAL_RETHROW (Pattern 1/3 of styleguide); audit doesn't have a heuristic; strict mode accepts. 2. 4 pre-existing INTERNAL_OPTIONAL_RETURN violations in non-baseline files (external_editor/session_logger/project_manager); out of scope. 3. Flaky test (test_do_generate_uses_context_files) passes in isolation but can fail in batched run; pre-existing test isolation issue.