Problem

The send_message tool silently drops media attachments when targeting Feishu/Lark.

When _send_to_platform() routes to Feishu, it calls _send_feishu() without passing the media_files parameter:

# Before (line 538-539)
elif platform == Platform.FEISHU:
    result = await _send_feishu(pconfig, chat_id, chunk, thread_id=thread_id)
    # ↑ media_files not passed — media silently dropped

This affects all other platforms (Telegram, Discord, Matrix, Weixin) correctly pass media_files in their respective branches.

Fix

Pass media_files to _send_feishu(), following the same pattern as Telegram/Discord/Matrix — media is only attached to the final chunk when a message is split:

# After
elif platform == Platform.FEISHU:
    is_last = (chunk is chunks[-1])
    result = await _send_feishu(
        pconfig, chat_id, chunk,
        media_files=media_files if is_last else [],
        thread_id=thread_id,
    )

Notes

• The _send_feishu() function already fully supports media (images, video, voice, documents) via the FeishuAdapter methods — it just wasn't being called with the parameter.
• Normal agent responses using MEDIA: syntax were unaffected because they go through BasePlatformAdapter.extract_media() in the gateway main loop, bypassing _send_to_platform() entirely.
• Lint check passed (syntax ok, no issues).