Unify LLM client creation and gauntlet defaults #162
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Summary\n- consolidate LLM client creation through the async factory with lazy initialization\n- support Gemini OAuth configuration in the shared factory path\n- allow gauntlet defaults to use provider-configured models and add Gemini provider support\n- document OAuth loopback setup and default Gemini model\n\n## Testing\n- not run (pre-commit blocked unrelated test harness earlier)