Fix JSR slow types

Our jsr packages are published using `--allow-slow-types` for now. We should remove it, but ideally with a build step or a new module root file for jsr. We have a number of types that are inferred from zod, and I'd rather not decrease the developer experience to fully support jsr.

To see which types raise this error, run `npx jsr publish --dry-run` on the individual packages.