ci: add OAuth scope LLM audit
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Adds a manual/CI-style LLM audit for OAuth2 default scopes across production-shaped toolkit config.ts files.\n\nValidation:\n- python3 -m py_compile ci_checks/lint_oauth_config_scopes_llm.py ci_checks/base/llm.py\n- python3 -m ruff check ci_checks/lint_oauth_config_scopes_llm.py ci_checks/base/llm.py noxfile.py