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So future features notwithstanding, is the typical Prisma workflow that if a migration failed during a production deploy the developer would have to manually work out how to fix it while the application is down?

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As of now there is no strong opinionation in the tool — you could absolutely maintain a set of down migrations to recover from bad deployments next to your regular migrations, and apply the relevant one (manually, admittedly) in case of problem.

Take a backup before you do any prod migrations.

Sure we do that before every release as well. But a rollback is a much less invasive surgical fix compared to a full database restore. You're down while the new db instance spins up and any writes in the meantime will be lost.

You can also test migrations against a restored prod database snapshot but again there's no guarantee some incompatible data hasn't been inserted in the meantime.

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