Write: NEAR Contract Patterns Cookbook

Description

## Overview
Create a cookbook of common NEAR smart contract patterns with copy-paste examples.

## Why This Matters
Patterns accelerate development. A cookbook is a go-to reference for developers.

## Content

### Patterns Covered
- Access control
- Upgradability
- Token standards
- Multi-sig
- Cross-contract calls
- Storage optimization

## Deliverables
1. **Pattern cookbook** - 20+ patterns
2. **Working code examples**
3. **When to use each**
4. **Published to docs**

## Budget: 6 NEAR

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