PRD Generation from User Story

Converts docs/UserStory.md into docs/PRD.md with structured functional requirements.

Purpose

Bridges the gap between user-focused stories and implementation-ready requirements by converting narrative descriptions into technical requirements.

Workflow

1. Read inputs

   • Read ralph/docs/templates/prd.md.template - follow its structure exactly
   • Read docs/UserStory.md - parse all sections: Problem, Users, Value, Stories, Criteria, Constraints

2. Extract and convert

   • User stories → Functional requirements (WHAT the system must do)
   • Success criteria + Constraints → Non-functional requirements (HOW it performs)
   • Group by functional area (CLI, API, Storage, etc.)