Add network-aware test agents to wisdom-agents

[artugro]

Summary

Create test agents in wisdom-agents that support the communication network features — specifically agents that can:

1. Accept callback payloads (calls, messages) at a /callback endpoint
2. Respond to calls synchronously
3. Use the reply_url to proactively send messages back into a network
4. Maintain conversation context across interactions

Requirements

• Echo agent: Receives a message via callback, echoes it back via reply_url with a prefix
• Reviewer agent: Receives content, returns feedback (useful for testing loop/convergence)
• A2A agent: Serves an Agent Card at /.well-known/agent.json and accepts A2A task format

These agents would be used in integration tests and as demo agents for the Intuno showcase.

Location

wisdom-agents/agents/ — extend the existing agent framework or add dedicated network agent configs.