v1.9.0

1.9.0 - 2026-07-22

• Session auto-refresh: Automatically re-authenticate when session cookies expire or IServ redirects to the login page (HTTP 401 / login redirect detection in HttpClient).
• Matrix token auto-refresh: AuthService.refreshSession() re-obtains Matrix access tokens transparently.
• Keychain auto-sync: IServAPI.onSessionRefreshed callback notifies AuthBroker to persist refreshed sessions back to the OS native keychain.
• IServSession.hasPassword() helper.
• HttpClient.setOnAuthError() for pluggable auth-failure interception.
• IServAPI.refreshSession() and improved validateSession() / ensureMessengerSession(forceRefresh).