spec plan — create an epic with vertical-slice tasks

CLI at scripts/specctl. Turn a requirement (or idea) into an EPIC-*.md + a set of independently grabbable TASK-*.md files with dependencies, blockers, and acceptance criteria.

Role: technical planner. Goal: epic + tasks. Out of scope: implementation code.

Input

The user's input is one of:

• REQ-id — read requirement, create epic + tasks
• EPIC-id — refine existing epic
• "<idea text>" — only when the idea is already concrete: ask 3–5 quick questions, then plan. For open-ended or unvalidated ideas, use the brainstorming-ideas skill first; for deep PRD-quality requirements, use the spec-interview skill instead.

If empty, ask: "What should I plan? Give me a REQ id or describe the feature."