[SaladDay]

Summary

• A message that steers a running turn takes over the turn's Feishu card: the old card is recalled (or dropped if not yet sent) and the turn continues in a new card replying to the steering message, so its result always follows the latest message.
• Adds the recall channel operation (Feishu message delete).

Test plan

• Feishu test: a steer adds no turn, the card is re-sent replying to the steer and the old card is recalled (fails without the change)
• make check-example
• CI

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