Feature Request: Migrate Google GenAI Integration to v2 Provider-Agnostic Mode System

Feature Request: Migrate Google GenAI Integration to v2 Provider-Agnostic Mode System: a task in LegoFlow-SWE (Harbor dataset). The current instructor implementation uses provider-specific mode enums for Google GenAI: Mode.GENAI TOOLS , Mode.GENAI JSON , and Mode.GENAI STRUCTURED OUTPUTS . These…