Add 'gemini' to prompt source types and route Gemini models to new Gemini-optimized prompts via isGeminiModel detection. Update barrel exports for all 3 agent modules. All existing tests pass.
Add 'gemini' to prompt source types and route Gemini models to new Gemini-optimized prompts via isGeminiModel detection. Update barrel exports for all 3 agent modules. All existing tests pass.