A demonstration answers whether an idea can work under selected conditions. A service must also work after a restart, during an ordinary error and in the hands of someone who did not build it.

Plan the deployment path, data ownership, operational logs and support process early. Record how configuration changes are applied and how a release can be rolled back. Make someone responsible for the next model or dependency update.

The goal is not paperwork for its own sake. It is a system the team can operate without depending on the original builder's memory.