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* refactor: remove deprecated OAuth authentication base classes Remove abstract/generic auth infrastructure superseded by the concrete implementations introduced in #9330 (LeanOAuthTokenHandler, LeanTokenHandler, LeanTokenCredentials): - Delete OAuthTokenHandler<TRequest, TResponse> - Delete abstract TokenHandler<T> base - Delete TokenCredentials (replaced by LeanTokenCredentials) - Delete abstract AccessTokenMetaDataRequest/Response base classes - Update XML documentation in LeanOAuthTokenHandler and LeanTokenHandler Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix: remove racy lockless fast path from LeanOAuthTokenHandler * fix: remove redundant AccessToken empty check on token refresh --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>