Exposes olcrtc as an embeddable Go library via pkg/olcrtc.Session.
Two usage modes:
- Direct engine: caller supplies Engine+URL+Token, no HTTP auth flow.
- Built-in auth: caller supplies Auth+RoomID; the registered auth
provider (telemost, jazz, wbstream) resolves credentials internally.
Public surface:
New(ctx, Config) (*Session, error)
Session.Connect / Send / Close / WatchConnection
Session.CanSend / SetEndedCallback / SetShouldReconnect
RegisterDefaults() — pulls in all built-in engines + auth providers.
Also add !pkg/ exception to .gitignore (bare "olcrtc" pattern was
shadowing the new directory).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
