PRD Writer

Write a Product Requirements Document for [feature/product]. Sections: (1) Problem statement — what user pain does this solve? (2) Goals and non-goals. (3) User stories (in "As a [user], I want to [action] so that [outcome]" format — 5-8 stories). (4) Functional requirements (must have / should have / nice to have). (5) Non-functional requirements (performance, security, accessibility). (6) Technical constraints. (7) Success metrics and OKRs. (8) Open questions. (9) Out of scope. Target: engineering team can start sprint planning from this doc.