Each auth.Provider now declares DefaultServiceURL() so callers do not
need to know service-specific endpoints. ApplyAuthDefaults fills Engine
and URL from the provider before validation runs — explicit flags always
win, and providers with no default URL require -url to be set explicitly.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Split the WB Stream provider into two orthogonal pieces:
- internal/engine/livekit — generic LiveKit transport (URL+Token only,
no service-specific assumptions). Registered as engine "livekit".
- internal/auth/wbstream — WB Stream API flow (guest register, join,
token exchange). Implements auth.Provider and auth.RoomCreator,
reports engine "livekit".
The carrier name "wbstream" now goes through registerEngineAuth, which
wires the auth provider to the engine it declares. CLI surface is
unchanged. session.Gen for wbstream calls the RoomCreator directly;
that path will become fully generic in a later step. jazz and telemost
remain on the legacy provider path for now.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
