Justfile lacks codegen support

[brettcannon]

I.e. checking the codegen files are up-to-date and regenerating the files.

[github-actions]

Thanks for opening this issue, @brettcannon!

I've labeled this as an enhancement. You're right that the Justfile currently lacks codegen support — while scripts/codegen/ has npm run generate tasks for regenerating types across all SDKs, there's no corresponding just recipe to run or verify codegen is up-to-date.

Adding recipes like codegen (to regenerate) and codegen-check (to verify) would align nicely with the existing format, lint, and test patterns already in the Justfile.

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