feat(vercel-sandbox,sandbox): fix ssh connection hanging

[marc-vercel]

When we do a ssh to a resumed sandbox, it works. But it does not work when trying to do a ssh into a new sandbox and it hanged.

There were two errors:

1. We hanged forever without showing the error. This has been fixed.
2. We could not connect because we did not pass the internal parameters (routes)

Testing

We have performed these tests:

❯ sandbox create
✅ Sandbox beige-leading-flea-4dExSp created.
   │ team: marc-codina-enhanced-vtest314
   ╰ project: my-sandbox-app

❯ sandbox ssh beige-leading-flea-4dExSp
$ sh
▲ /vercel/sandbox/ echo 'hi'
hi
▲ /vercel/sandbox/ exit
exit
╰▶ connection to ▲ beige-leading-flea-4dExSp closed.

❯ sandbox stop beige-leading-flea-4dExSp
✔ Stopping active session from beige-leading-flea-4dExSp

❯ sandbox ssh beige-leading-flea-4dExSp
$ sh
▲ /vercel/sandbox/ exit
exit
╰▶ connection to ▲ beige-leading-flea-4dExSp closed.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
sandbox-sdk	Ready	Preview	Mar 17, 2026 3:49pm