Use a unique machine ID for each stack verification run so repeated checks
against a persisted control-plane state keep exercising the bootstrap flow
without failing on node-scoped re-registration auth.
Generated with [Devin](https://cli.devin.ai/docs)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Protect the control-plane API with explicit bearer auth, add node-scoped
registration/heartbeat credentials, and make export mount paths an explicit
contract field so mount profiles stay correct across runtimes.
Generated with [Devin](https://cli.devin.ai/docs)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
