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c605b0b080
Adopt the same channel-level pattern as weixin/wecom_bot/feishu so the agent actually sees attachments the user sent: - IMAGE: agent mode never reads memory.USER_IMAGE_CACHE, so a photo sent before a question (e.g. "image" then 30s later "what's this?") used to be lost. Now lone images go into channel.file_cache and the next TEXT turn appends "[图片: <path>]" to the query before producing the context. Cross-batch image+text combinations now work as users expect. - FILE: previously dropped at the sync_msg filter and unsupported by WechatKfMessage. Add msgtype="file" parsing, download via the WeCom media API, preserve the original filename from Content-Disposition (RFC 5987 + plain forms), and route through the same file_cache pipeline as images, surfacing as "[文件: <path>]" in the next text turn.