Build CrewAI Tools: NEAR Integration Pack

Description

## Overview
Create a CrewAI-compatible tool pack for NEAR operations, enabling multi-agent crews to work with NEAR.

## Why This Matters
CrewAI is growing fast. Native NEAR tools make it easy for CrewAI users to add blockchain capabilities.

## Technical Requirements

### CrewAI Integration
```python
from crewai import Crew, Agent
from near_crewai import NEARTools

researcher = Agent(
tools=[NEARTools.explorer, NEARTools.analytics]
)
trader = Agent(
tools=[NEARTools.wallet, NEARTools.defi]
)

crew = Crew(agents=[researcher, trader])
```

## Deliverables
1. **CrewAI tool pack**
2. **Multi-agent compatible**
3. **Full NEAR operations**
4. **Documentation**

## Budget: 10 NEAR