chore: add skills library

claude-skills/prd.md

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+---
+name: prd
+description: Write a Product Requirements Document (PRD). Use when planning a new feature, product, or significant change that needs clear scope, goals, and acceptance criteria before implementation starts.
+---
+
+# PRD (Product Requirements Document) Skill
+
+Use when: starting a new feature, planning a major change, or needing to align on scope before building.
+
+## PRD Template
+
+```markdown
+# PRD: [Feature Name]
+
+**Status:** Draft / In Review / Approved  
+**Author:** [Name]  
+**Date:** [Date]  
+**Version:** 1.0
+
+---
+
+## Problem Statement
+What problem are we solving? For whom? What's the current pain?
+
+## Goals
+- [ ] Goal 1 (measurable)
+- [ ] Goal 2 (measurable)
+
+## Non-Goals (explicitly out of scope)
+- X is not included in this version
+- Y will be addressed in a follow-up
+
+## User Stories
+As a [user type], I want to [action] so that [outcome].
+
+### Acceptance Criteria
+- Given [context], when [action], then [expected result]
+- Given [context], when [action], then [expected result]
+
+## Proposed Solution
+High-level description of the approach. NOT detailed implementation — that's for the tech spec.
+
+## UX / Design
+- Wireframe or mockup link (if exists)
+- Key user flows
+- Edge cases and empty states
+
+## Technical Considerations
+- Dependencies on other systems
+- Performance requirements
+- Security/privacy implications
+- API contracts needed
+
+## Success Metrics
+How will we know this succeeded?
+- Metric 1: [what we'll measure, target value]
+- Metric 2: [what we'll measure, target value]
+
+## Timeline
+- [ ] Design review: [date]
+- [ ] Dev kickoff: [date]  
+- [ ] Alpha/internal: [date]
+- [ ] Launch: [date]
+
+## Open Questions
+- [ ] Question needing answer before build
+- [ ] Dependency on team X decision
+```
+
+## Process
+1. Fill in Problem Statement and Goals first — if you can't articulate these clearly, stop.
+2. Write Non-Goals explicitly — prevents scope creep.
+3. Write Acceptance Criteria in Given/When/Then format — these become test cases.
+4. Review with stakeholders before dev starts.
+5. Mark open questions and assign owners.