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docs/architecture-refactor.md §3 sketched the trait with "按需扩展: edit_message_caption / delete_message / answer_callback_query …", but only the five send methods landed, so `callback.rs` and the edit-before-forward caption swap were stuck on the concrete `Bot` and remained untested (AGENTS.md still lists callback.rs as untestable). - `MediaSender` gains `answer_callback_query`, `edit_message_caption` (HTML parse mode baked in, every caller uses it) and `delete_message`; the mock records call order plus the texts, captions and answer toasts, so tests can assert what the user saw. - `send_message` now returns the sent message id instead of the whole `Message`: the only consumer of the value is the edit-before-forward prompt (which keys its record by it), and returning a `Message` forced every mock to build a teloxide type. `reply`/`reply_html` follow. - `callback.rs`: the dptree entry only unpacks the update; `handle_callback` takes plain values + `&AppContext`. `handlers/mod.rs::edit_message_handler` likewise takes the values the reply carries. Admin/setup APIs (`get_chat`, `get_chat_administrators`, `get_me`, `set_my_commands`) stay on the concrete `Bot`: they are not user flows worth a trait. - The scripted mock moves to `parking_lot::Mutex` (no poisoning unwraps). Tests: +11 (template button, forward ok/no-channel/retryable, expired+unknown prompt, caption swap via template, escaping of user text into the caption, failed swap still consuming the reply, prompt record written by post_send). fmt/clippy clean, 70 + 69 tests pass.