[codex] fix test isolation and metal recommendations

[lalalune]

Summary

• require real GGUF sources for Apple Silicon hardware-fit recommendations
• isolate tests that were leaking stubbed core and SQLAlchemy modules across the suite
• make topic analyzer regression tests owner-aware

Validation

• uv run --no-project --with-requirements requirements.txt --with pytest python -m pytest tests/test_hwfit_macos.py tests/test_research_query_fallback.py tests/test_scheduler_restart_doublefire.py tests/test_security_regressions.py::test_auth_manager_migrates_legacy_admin_role tests/test_topic_analyzer.py tests/test_task_scheduler_session_delivery.py -q
• git ls-files 'tests/test*.py' | xargs -r uv run --no-project --with-requirements requirements.txt --with pytest python -m pytest -q
• python3 -m py_compile app.py core/.py routes/.py src/.py services/**/.py tests/*.py
• node --check static/js/research/panel.js
• node --check static/js/modalManager.js
• docker compose --env-file .env.example config

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