telegramR - Interact with the 'Telegram' 'MTProto' API

Provides a full-featured client for the 'Telegram' 'MTProto' protocol (<https://core.telegram.org/api>), enabling programmatic access to 'Telegram' chats, channels, messages, media, and stories. Implements binary encoding and decoding of the 'Telegram' 'TL' (Type Language) schema, authentication (including two-factor), encrypted transport, and high-level helpers for downloading channel history and reactions at scale. Intended for social-science research and data collection tasks that require direct API access rather than the 'Bot API'.