The correct option is Use GitHub Codespaces when you must build and run the app and need a terminal for tools and tests.

Codespaces provides a full development environment in the cloud with a container, compute resources, and an integrated terminal. You can build and run the application, run tests and scripts, and use debugging tools. This matches the need to compile and run the service and to have terminal access for debugging and scripts.

GitHub.dev is a lightweight browser editor that is ideal for quick edits and code browsing. It does not provide a runtime or an integrated terminal, so you cannot compile, run, or debug the application there. That is why Codespaces is the appropriate choice for this scenario.

Choose GitHub.dev for heavy builds and use Codespaces only to browse files is incorrect because GitHub.dev is not suited for heavy builds or running code, while Codespaces is designed for those tasks rather than being limited to browsing.

Prefer GitHub.dev for testing and building code while reserving Codespaces for navigation tasks is incorrect because testing and building require a runtime and terminal which GitHub.dev does not provide, and Codespaces is the environment intended for building, testing, and debugging.

Use Google Cloud Shell Editor instead of either option for compiling and running the project is incorrect in this context because the decision is between GitHub.dev and GitHub Codespaces, and the GitHub platform solution that meets the requirements is Codespaces.

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