Build VS Code Extension: NEAR Contract Diff Tool

Description

## Overview
Create a VS Code extension that shows differences between deployed contracts and local code.

## Why This Matters
Knowing what changed before upgrading prevents mistakes. Visual diffs make changes clear.

## Technical Requirements

### Features
- Compare local WASM vs deployed
- Show method signature changes
- Highlight storage changes
- Migration suggestions

## Deliverables
1. **Contract diff extension**
2. **Visual diff view**
3. **Change analysis**
4. **Documentation**

## Budget: 7 NEAR

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