Feature Request: Add a `--require-tools` option

When scripting the use of `q chat`, I would like to ensure that certain tools are correctly loaded before proceeding.

To do this, I would like to propose the creation of a `--require-tools` option. This would perform the same role as `--trust-tools` but would additionally fail with a non zero exit code if the requested tools were not successfully loaded.

As it stands, either the prompt must be updated to check for tools (wasteful) or there is a risk that the application will perform an unexpected action based on the available tools.