fix: send WhatsApp TTS as native audio

[noestelar]

Summary

• add a WhatsApp-specific send_voice() implementation
• route voice replies through _send_media_to_bridge(..., "audio", ...)
• add regression tests so WhatsApp audio is uploaded as native media instead of sending the file path as text

Test Plan

• source venv/bin/activate && python -m pytest tests/gateway/test_whatsapp_voice.py -q

Notes

• I also re-ran the broader WhatsApp gateway subset earlier during validation.
• With the live gateway running, some connect tests can fail locally because the adapter detects the active WhatsApp session lock.

[Copilot]

Pull request overview

This PR fixes WhatsApp TTS/voice delivery by adding a WhatsApp-specific send_voice() implementation that uploads audio through the WhatsApp bridge as native media (instead of falling back to the base adapter behavior of sending the local file path as text).

Changes:

• Added WhatsAppAdapter.send_voice() to route audio through _send_media_to_bridge(..., "audio", ...).
• Added regression tests asserting that WhatsApp voice sends hit the bridge /send-media endpoint with mediaType="audio" and carry captions through the adapter payload.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
gateway/platforms/whatsapp.py	Adds a WhatsApp-specific send_voice() that uses the bridge native media upload path.
tests/gateway/test_whatsapp_voice.py	New regression tests verifying bridge payload and endpoint usage for native audio sends.

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[teknium1]

Thanks for the fix! The same send_voice() override already landed on main in commit ed76185 ("feat(whatsapp): implement send_voice for audio message delivery") via #12656, so this PR is now a no-op diff against current main. Closing as superseded — the behavior you fixed is in main today.

ed76185

[alt-glitch]

Likely duplicate of #13002 — same WhatsApp send_voice() fix already merged.

[alt-glitch]

Likely duplicate of #13002