Add support for CI

Adding features is becoming more and more complex, we should add some sample scene and implement a proper Test-Driven development pipeline

The issue names no files, tests, entry points, or specific CI service. Start by clarifying which sample scene and exporter workflows are in scope, then identify the existing test setup and define the pipeline checks; done should mean the agreed sample scene is covered by repeatable tests in CI.

Written by the indexing model from the issue text.