Detect Missing Circuit Breakers

# 🧠 Concept  
Detect contracts lacking emergency stop mechanisms.

## ⚠️ Problem  
No pause system increases incident severity.

## 📁 Implementation Scope  
- `rules/security/emergency/`

## ✅ Requirements  
- Detect absence of pause logic  
- Suggest circuit breakers  

## 🎯 Acceptance Criteria  
- [ ] Missing emergency controls flagged  