ai → agent Relation

File in src/cli/service/ai	Includes file in src/cli/service/agent
ai_service.cc	conversational_agent_service.h
anthropic_ai_service.cc	conversational_agent_service.h
gemini_ai_service.cc	conversational_agent_service.h
ollama_ai_service.cc	conversational_agent_service.h
openai_ai_service.cc	conversational_agent_service.h
prompt_builder.cc	conversational_agent_service.h