Add og-veil test command for end-to-end verification testing

[adambalogh]

Summary

This PR adds documentation and command reference for a new og-veil test command that allows users to verify the complete TEE attestation path (login → encrypt → enclave → verify) with a single one-off prompt before integrating with their agent.

Changes

• Added usage example showing og-veil test with a sample prompt in the quick start section
• Added explanatory paragraph describing the purpose and benefits of the test command
• Updated the "Useful commands" section to include og-veil test as the first command listed
• Added og-veil test to the command reference table with its description

Details

The test command provides a quick way for users to:

• Verify the entire verified TEE response path works end-to-end
• Confirm login, encryption, enclave processing, and verification all function correctly
• See the tee_id in the response to validate attestation
• Test before wiring up their agent integration

This improves the onboarding experience by giving users immediate confidence that the system is working before proceeding with agent setup.

https://claude.ai/code/session_01TGczZtwLgTT4WJVWKAhcLA