feat(agent): add web search agent with exa integration

[TimPietruskyRunPod]

Summary

Add Web Search Agent that uses Exa for AI-optimized web search and summarization.

Closes CSE-785

Changes

• Add web-search-tool.ts using exa-js for semantic web search
• Add web-search-agent.ts that searches and summarizes results
• Returns key points and sources (title + URL)
• Update README with:
  • Agent documentation with curl examples
  • Environment variable for EXA_API_KEY
  • Section for developers on creating custom agents

Testing

Tested locally with Docker:

curl -X POST http://localhost:8080/api/agents/webSearchAgent/generate \
  -H "Content-Type: application/json" \
  -d '{"messages": [{"role": "user", "content": "Search for RunPod serverless news"}]}'

Response:

Here are the key points from the latest RunPod serverless news:

1. **2025 Serverless LLM Update** - RunPod introduced updates to enhance serverless LLM usage...
2. **SOC 2 Type II Compliance** - RunPod achieved SOC 2 Type II compliance...
3. **Worker Templates for Serverless** - A new feature allows users to create workers from templates...

All sources are from RunPod's official blog.

Environment Variables

• EXA_API_KEY: Required for web search agent (get one here)

[max4c]

LGTM