Write: NEAR Gas Optimization Guide

Description

## Overview
Create a comprehensive guide to optimizing gas usage in NEAR smart contracts.

## Why This Matters
Gas costs affect user experience. Optimization knowledge helps developers build efficient contracts.

## Content

### Topics
- Understanding NEAR gas model
- Storage vs compute costs
- Batching operations
- View method optimization
- Cross-contract call efficiency

## Deliverables
1. **Optimization guide** - 4000+ words
2. **Before/after examples**
3. **Measurement techniques**
4. **Published to docs**

## Budget: 5 NEAR