## Summary
- add a `resend:sync-leads` command that syncs all `user_leads` into the
Resend leads segment
- make lead sync idempotent by creating contacts with the segment and
falling back to adding existing contacts to the segment
- schedule the command daily at `03:00` UTC and cover the
command/fallback behavior with Pest tests
## Testing
- php artisan test --compact
tests/Feature/ResendSyncLeadsCommandTest.php