docs: update readme to connect protocol layers

[yungcero]

Summary

Update documentation to include implementation of identity layer and enforcement layer for ai agents.

Related Issues

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• [X ] 📝 Documentation update
• 🔧 Configuration change
• ♻️ Refactoring (no functional changes)
• 🧪 Test improvement
• 🔒 Security fix

Changes Made

• Updated README.md

Testing

• Unit tests added/updated
• Manual testing performed
• Tested with real MCP server
• Tested policy enforcement

Test Commands

# Commands used to test
cd proxy
make test
make build
./bin/aip --policy examples/agent.yaml --target "python3 test/echo_server.py" --verbose

Policy Impact

• No policy changes
• New policy feature (describe below)
• Policy behavior change (describe migration path)

Security Checklist

• No new dependencies with known vulnerabilities
• No secrets or credentials in code
• Audit logging maintained for new operations
• Input validation added for new parameters
• Documentation updated for security implications

Documentation

• [X ] README updated (if needed)
• Code comments added for complex logic
• Example configurations updated
• CHANGELOG entry added (for user-facing changes)

Screenshots / Recordings

Checklist

• My code follows the project's code style (make lint passes)
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing unit tests pass locally (make test)
• Any dependent changes have been merged and published

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/cc @ArangoGutierrez