Previously SendOTP silently dropped requests for unknown emails, so new
users had no passwordless path in. Now:
- SendOTP: if REGISTRATION_ENABLED and email unknown, generates and
sends the code anyway (UserID nil until verify)
- VerifyOTP: if email unknown after valid code, auto-registers the user
(emailVerified=true — OTP delivery proves ownership, name defaults to
email local-part) then creates a session
REGISTRATION_ENABLED=false continues to block unknown emails at SendOTP,
preserving invite-only / closed-beta behaviour.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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