Start live proof from the final committed source

After approval, use the customer's existing official PostHog SDKs to capture analytics after every approved durable success and exceptions at approved failure exits. Agentry provides no browser or server telemetry credential. Test, commit a clean shipped tree, run the source helper with --final, and submit only its snapshot. Attach the returned short-lived runtime marker as the agentry_onboarding_proof PostHog event property while exercising real product paths. Use the separate CI marker header only on trusted Agentry deploy attribution. Neither marker authorizes writes.