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Issue: Takopi lacks multi-transport support, config migration, and env overrides

Issue: Takopi lacks multi-transport support, config migration, and env overrides: a task in LegoFlow-SWE (Harbor dataset). Currently, Takopi is hardcoded to use the Telegram transport only. There is no abstraction for adding new transports, no CLI command to list them, and no mechanism to select a…

The task

Currently, Takopi is hardcoded to use the Telegram transport only. There is no abstraction for adding new transports, no CLI command to list them, and no mechanism to select a transport at runtime. Additionally, legacy config files using top-level `bot_token` and `chat_id` keys cause errors instead of being…

Part of Lego-X/LegoFlow-SWE.