fix: reject Telegram messages from unauthorized chats - #5
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Add grammy middleware that silently drops incoming messages when the chat ID doesn't match TELEGRAM_CHAT_ID. This prevents unauthorized users from accessing the bot's tools and agent. The guard is a no-op when TELEGRAM_CHAT_ID is unset. https://claude.ai/code/session_01DPVMtufRScy6tgmSbfRU5s
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