Roadmap

Sequence ideas from a /ideate artifact into a phased roadmap with falsifiable exit criteria. Hard-gates on the ideas artifact — every milestone traces back to IDEA-### IDs. Writes roadmap-YYYY-MM-DD.md. Competitor analysis is out of scope (see future /market-scan). TRIGGER WHEN: user has a /ideate artifact and wants to sequence ideas into a phased roadmap, asks 'create a roadmap', 'plan our sprints', 'prioritize these ideas into milestones'. PREREQUISITE: ideas-YYYY-MM-DD.md must exist. DO NOT USE WHEN: no ideate artifact exists (run /ideate first), or user wants raw feature ideas (use /featurate or /ideate instead).