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RESULTS: - test_gemini_provider_passes_qa_callback_to_run_script: PARALLEL-EXECUTION FLAKE. Passes 5/5 in isolation on both parent (4ab7c732) and current (0c62ab9d). Fails only under xdist parallel execution (tier1_full_run.txt shows [gw3]). NOT a regression. Phase 12's 'Gemini 503' classification was WRONG -- it is a mock assertion failure that occurs when workers contend for the mock setup. - test_auto_aggregate_skip: PRE-EXISTING (network-dependent). Gemini API 503 on both parent and current. Flaky. Will be documented with @pytest.mark.skip in Phase 13.4. - test_view_mode_summary: PRE-EXISTING (network-dependent). Gemini API 503 on current commit. Flaky. Will be documented with @pytest.mark.skip in Phase 13.4. Phase 12's 'verified via git stash before my changes' claim was UNVERIFIED. The actual parent-commit run (this commit) shows: 0 regressions, 2 pre-existing flakies, 1 parallel-execution flake. Phase 13.3 has no work to do (no regressions to fix). Phase 13.4 will add @pytest.mark.skip to the 2 pre-existing failures.