init Type Builder error doesn't suggest alternatives

[angeloashmore]

When prismic init blocks because the Type Builder isn't enabled for a repository, the error message is a dead end:

This command requires the Type Builder in your repository.

There's no guidance on what to do next. In practice, most of the CLI works without the Type Builder gate:

• gen setup generates all framework files (prismicio.ts, preview routes, slice simulator, revalidation route) with no Type Builder check
• type create, field add, slice create, gen types all work independently
• The user can manually create prismic.config.json and use all of the above

In a recent agent test session, the agent hit this error and incorrectly concluded that gen setup also requires the Type Builder. It then manually created all 5 framework files that gen setup would have generated automatically.

The error should guide users toward the working path when they can't use init.