c4-documentation

# C4 Documentation Skill

Create architecture documentation using the C4 model's four levels of abstraction.

## MANDATORY: Documentation-First Approach

Before creating C4 documentation:

1. **Invoke `docs-management` skill** for C4 patterns
2. **Verify C4 model syntax** via MCP servers (context7 for Structurizr/Mermaid)
3. **Base guidance on c4model.com official documentation**

## C4 Model Overview

```text
C4 Model - Four Levels of Abstraction:

Level 1: System Context
┌─────────────────────────────────────────────────────────────────────────────┐
│  Shows the system in context with users and external systems                 │
│  Audience: Everyone (technical and non-technical)                            │
└─────────────────────────────────────────────────────────────────────────────┘
                                    ↓
Level 2: Container
┌─────────────────────────────────────────────────────────────────────────────┐
│  Shows high-level technology choices and responsibilities                    │
│  Audience: Technical people (inside and outside the team)                    │
└─────────────────────────────────────────────────────────────────────────────┘
                                    ↓
Level 3: Component
┌─────────────────────────────────────────────────────────────────────────────┐
│  Shows components within a container                                         │
│  Audience: Software architects and developers                                │
└─────────────────────────────────────────────────────────────────────────────┘
                                    ↓
Level 4: Code (Optional)
┌─────────────────────────────────────────────────────────────────────────────┐
│  Shows classes, interfaces, and implementation details                       │
│  Audience: Developers (often auto-generated)                                 │
└─────────────────────────────────────────────────────────────────────────────┘
```

## Level 1: System Context Diagram

### Purpose

Sho