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* fix(channels): keep Feishu cards within the card size limit Card text was unbounded and ASCII-escaped, so an answer of about 4,400 CJK characters made the card request body exceed Feishu's 30 KB limit (230025). The final patch and its reply fallback were both rejected, the answer was lost and the running card stayed on its last streamed text. Cards are now serialized without ASCII escapes and budgeted by the bytes their text adds to the request body. A streamed update shows what fits; a longer final answer continues in up to 10 cards replied to the same source message, split at line breaks, and a retry resumes after the cards already delivered. * docs(changelog): reference #7798 for the Feishu card size fix --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>