Break a large PRD or product idea into a release plan for an OpenSpec project — personas, journey map, MoSCoW priorities, and thin vertical stories captured as a checklist in openspec/discovery.md that feeds /opsx:propose one story at a time. Use when a feature or PRD is too big for one OpenSpec change, when the user asks to split or prioritize work, or to resume or revise an existing discovery.md. Requires the openspec CLI.
