LangChain - NEAR DeFi Tool

Description

**THE VIRAL LOOP:**
```
Agent needs DeFi operations
→ Uses NEAR DeFi tool
→ Swaps, stakes on NEAR
```

**Deliverables:**
- Ref Finance swaps
- Burrow lending
- Meta Pool staking

**PUBLISHED TO:** PyPI, LangChain Hub

**Success Metrics:** 50+ agents use DeFi tool