Applied 236 return type annotations to functions with no return values
across 100+ files (core modules, tests, scripts, simulations).
Added Phase 4 to python_style_refactor track for remaining 597 items
(untyped params, vars, and functions with return values).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This change corrects the implementation of get_gemini_cache_stats to use the Gemini client instance and updates the corresponding test to use proper mocking.