WhatsApp PTT voice-note delivery not working

The [[audio_as_voice]] directive is parsed in the agent-runner (agent-runner.runtime-CUJd1OG7.js) and sets audioAsVoice: true on the payload, but this flag is never consumed by the WhatsApp channel send layer.

Expected behavior

When an agent reply includes [[audio_as_voice]] with a MEDIA attachment of an .ogg opus audio file, WhatsApp should deliver it as a PTT (push-to-talk) voice note.

Actual behavior

The audio is delivered as a regular file/document attachment, not as a voice note.

Steps to reproduce

1. Generate an ogg opus audio file
2. Reply with [[audio_as_voice]]\nMEDIA:/path/to/file.ogg
3. Message arrives on WhatsApp as a file, not a voice note

Environment

• OpenClaw on Contabo VPS
• WhatsApp Web channel (Baileys)