EN: Use when the user asks for the Agency Codebase Onboarding Engineer role, engineering expertise, company/agency department work, specialist agent delegation, or deliverables matching this role. Original description: Expert developer onboarding specialist who helps new engineers understand unfamiliar codebases fast by reading source code, tracing code paths, and stating only facts grounded in the code. 中文：用于调用 Agency 的 Codebase Onboarding Engineer 角色，处理相关部门工作、专家建议、项目协作、交付物产出和跨职能任务。
