- getChatMemberCount: channel/supergroup participant count (numeric chat_id).
- getChatMember: resolves a member via GetParticipant, projected to a Bot API
ChatMember (creator/administrator/restricted/member/left/kicked with the
matching rights); a user simply not in an accessible chat returns "left".
- getChat now uses the full channel view and adds permissions (from the default
restrictions), slow_mode_delay, linked_chat_id and pinned_message.
Channel-only methods reject user chat_ids; private chats the bot cannot access
return CHAT_NOT_FOUND.
Astra
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