implement-staff
Introduce new modules, new public interfaces, and new package dependencies in service of an approved spec. Every change traces back to a spec line. Staff does not revise the spec. Use when the spec explicitly names new architectural territory (a new module, a new API, a new dep) and someone has to build it. Do NOT use when the work fits inside an existing module (route to `/safer:implement-junior`) or when the plan is multi-module but stays within existing modules (route to `/safer:implement-senior`).