Decomposes a PRD or large epic into prioritized OpenSpec slices in openspec/roadmap.md and keeps slice lifecycle in sync with propose, apply, and archive. Use when a PRD exists but work is still one mega proposal, when breaking a feature into multiple OpenSpec changes, when picking the next slice, o
Decomposes a PRD or large epic into prioritized OpenSpec slices in openspec/roadmap.md and keeps slice lifecycle in sync with propose, apply, and archive. Use when a PRD exists but work is still one mega proposal, when breaking a feature into multiple OpenSpec changes, when picking the next slice, or when updating roadmap status after OpenSpec steps.