discover
Phase 1 — Discovery. Runs an interactive dialogue (1–5 rounds) to turn an idea into an approved PRD with introduction/overview, goals, product invariants, functional requirements (FR-N), non-goals, technical considerations, risks, success metrics, and open questions. User stories (US-###) are authored downstream in `/yoke:acceptance-criteria` (Phase 3) — the PRD captures product intent and cross-cutting FRs; story-level decomposition with DoD and Acceptance Criteria belongs to the Senior-QA grill, not the Product-Manager grill. Saves to `.yoke/prds/<YYYY-MM-DD>-<slug>.md` and sets `.yoke/runtime/.current` to the slug. Pauses for explicit human approval (Trigger 1) before completing.