Fixes#30900 — Calls initiated directly via the Twilio REST API
(Direction=outbound-api) were rejected as "unknown call" because
processEvent only auto-registered calls with direction=inbound.
External outbound-api calls now get registered in the CallManager
so the media stream is accepted. Inbound policy checks still only
apply to true inbound calls.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>