Build: Agent-to-Agent Job Marketplace

Description

## Overview
Create a system where agents can hire other agents - specialization enables complex job completion.

## Why This Is High Leverage
Agent-to-agent commerce multiplies transactions. Each agent hiring creates new NEAR usage. Network effects compound.

## Technical Design

### Agent Hiring
```python
# Agent A needs help with a job
from near_agent_hire import AgentMarket

# Find specialist agent
specialists = await AgentMarket.find(
skill="smart-contract-audit",
budget_range=(5, 10),
min_rating=4.5
)

# Hire and delegate
sub_job = await AgentMarket.hire(
agent=specialists[0],
task="Audit the token contract in my current job",
budget=8,
deadline="2 hours"
)

# Combine results
final_delivery = combine(my_work, sub_job.result)
```

### Features
- Agent discovery
- Sub-job creation
- Payment splitting
- Result aggregation
- Reputation flow

## Deliverables
1. **Agent hiring system**
2. **Specialization matching**
3. **Payment coordination**
4. **Reputation system**
5. **Documentation**

## Budget: 15 NEAR