Update README.md

[ExposureGuard]

More specific audience

Summary

Why

What changed

How I tested

• Ran pytest tests/ locally — all pass
• Self-host still works (docker compose up -d + curl localhost:8000/health returns 200)
• Relevant integration example still runs (langchain_agent.py / crewai_crew.py / vercel_ai_sdk.ts)

Checklist

• Commit messages are tidy (squash exploratory commits)
• CHANGELOG.md entry added (for user-visible changes)
• Docs updated (README / wiki / module docstrings)
• No security-sensitive changes without a matching note in SECURITY.md if needed