spec-plan

Create requirements.md and tasks.md for a project spec, with traceability and status tracking. Use when the user asks for a spec, requirements, task plan, or execution breakdown (e.g. "做个 spec", "拆任务", "出执行计划", "write a spec", "plan tasks"). Requires an approved specs/<topic>/design.md as input; if missing, route to the brainstorming skill first.