It works in essentially every other profession. Programming isn’t that special.

In essentially every other profession the credential is gated behind years of work experience and often a degree or course.

We already have such a credential. It's called "lasting two years at a FAANG+ without getting fired". If you do that you can get interviews anywhere.

It appears that the coding job will be some variation will be some variation of vibecoding going forward, so a professional cert might be good enough.