/explain

Explain a systems design concept

# Explain Systems Design Concept

Explain a systems design concept in practical, developer-friendly terms.

## Arguments

`$ARGUMENTS` - The concept to explain (e.g., "CAP theorem", "sharding", "circuit breaker", "load balancing")

## Workflow

1. **Identify the concept category** to load the appropriate skill:
   - Interview methodology → `design-interview-methodology`
   - Estimation/capacity → `estimation-techniques`
   - Quality attributes/NFRs → `quality-attributes-taxonomy`
   - Future phases: distributed systems, scalability, cloud-native

2. **Provide a practical explanation** that:...