/sc:principles - Code Principles Validator

Mandatory validation skill enforcing four fundamental software engineering principles:

1. KISS (Keep It Simple, Stupid) - Code should be as simple as possible
2. Functional Core, Imperative Shell - Business logic must be pure; I/O belongs at edges
3. SOLID - Single Responsibility, Open-Closed, Liskov Substitution, Interface Segregation, Dependency Inversion
4. Let It Crash - Fail fast for bugs; handle errors explicitly at boundaries

Quick Start

# Full validation (all four principles)
/sc:principles src/

# KISS only validation
/sc:principles src/ --kiss-only