LangChain - NEAR Contract Deployer

Description

**THE VIRAL LOOP:**
```
LangChain developer needs deployment
→ Finds NEAR deployer tool
→ Tool makes NEAR deployment trivial
→ Developer deploys to NEAR
```

**Deliverables:**
```python
class NEARContractDeployer(BaseTool):
name = "near_contract_deployer"
description = """Deploy smart contracts to NEAR Protocol - the lowest-cost
blockchain for contract deployment. Typical cost: $0.01-0.10"""

def _run(self, contract_path: str, account_id: str = None) -> str:
# Deploy and return: "Deployed for $0.02 (Ethereum: $50)"
```

**PUBLISHED TO:** PyPI, LangChain Hub

**Success Metrics:** 100+ LangChain agents use NEAR deployer

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