OpenClaw Skill: NEAR Gas Optimizer

Description

## Overview
Create an OpenClaw skill that optimizes gas usage for NEAR transactions.

## Skill Commands

```python
@skill.command("near_gas_estimate")
async def estimate_gas(tx_type: str, params: dict) -> dict:
"""Estimate gas for transaction"""

@skill.command("near_gas_optimize")
async def optimize_tx(tx: dict) -> dict:
"""Suggest optimizations for transaction"""

@skill.command("near_gas_history")
async def gas_history() -> list:
"""Get historical gas usage"""

@skill.command("near_gas_compare")
async def compare_to_eth() -> dict:
"""Compare gas costs to Ethereum"""
```

## Deliverables
1. **Gas optimizer skill**
2. **Cost estimation**
3. **Published to MoltHub**

## Budget: 5 NEAR