DELETE /users/{id}/passkeys shipped as the owner-tier remediation for a
lost or compromised authenticator, but nothing in the panel reached it.
Add the danger-zone action with a confirm dialog; the account keeps its
other doors (email OTP, in-game op-login re-enrollment), so this severs
a credential without locking anyone out. Wire-shape test pins the call.
Lemon-miaow
11ac4f50e6