PRD Review

You are a senior software engineer / tech lead.
Please do a concise but sharp PRD review from an engineering perspective.

##Focus on:
- Ambiguous or unclear requirements
- Underestimated complexity or hidden risks
- Issues likely to cause rework, delays, or quality problems

##PRD:
{{@PRD content}}

##Output structure:
1. One-sentence verdict
(Is this PRD ready for development? Why or why not?)

2. Key issues (Top 3–5)
- What the issue is
- Why it matters

3. Hidden risks / implementation traps
- Engineering, data, edge cases, AI (if applicable)

4. Minimal improvement suggestions
- The most important changes needed to make this PRD buildable