Document what `userToken` is used for in `auth.authEmailPasswordless`

[NathanFlurry]

[linear]

OGB-67 Document what `userToken` is used for in `auth.authEmailPasswordless`

[NathanFlurry]

@greptileai

[greptile-apps]

The userToken in auth.authEmailPasswordless is used to fetch the existing user if a session token is provided. It is validated using the authenticate_user script from the users module.

References

/modules/auth/scripts/auth_email_passwordless.ts
/modules/users/scripts/authenticate_user.ts

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