Set file permissions directly in the Sandbox SDK writeFiles API without a separate chmod call, improving performance.

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Vercel Sandbox SDK version 1.9.0 introduces a new `mode` property in the `writeFiles` API, allowing file permissions to be set directly when writing files. This removes the need for a separate `chmod` execution round-trip, improving performance when creating executable scripts or managing access rights inside the sandbox.

Sandbox SDK adds file permission control