Move the email-verification URL hash from sha1 to sha256 and verify it
directly in the controller using hash_equals, instead of going through
Laravel's EmailVerificationRequest (which only compares against sha1).
The signed URL still carries the authoritative HMAC; the hash upgrade
keeps the identity binding aligned with modern hashing guidance.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
