Performs a REAL outbound delivery to the configured recipient and records a verdict.

This is why admin.platform.alerts.test is a distinct scope and is NOT implied by
.write: the recipient is outside the deployment and cannot be un-notified, so being
able to configure a destination and being able to make the platform message it are
different capabilities with different blast radii.

Rate-limited per destination. Without a limit this endpoint is an amplifier: an
authenticated caller could drive unbounded outbound messages to an address they chose,
at the platform's reputation and cost.

The recorded verdict is a CLOSED classification, never a reason relayed from the
delivery service — the value is stored, read back and rendered.

Authorization: admin.platform.alerts.test.