Tell WhoLayer about logged-in users

If a visitor signs in or gives you their email, you can tell the tag:

wholayer("identify", "jane@example.com");

The tag turns the email into a SHA-256 hash in the browser before sending it, so the plain address never leaves the page. The hash helps us match that visitor more reliably.

Only call this for people who gave you their email directly, and make sure your privacy policy covers it.