Preserve microphone audio for Cloudflare Voice

[codeyogi911]

Summary

• preserve ArrayBuffer delivery for inbound voice WebSocket frames while @cloudflare/voice 0.3.5 requires it
• assert the compatibility bridge survives production config generation
• document the removal condition for a future voice package upgrade

Evidence

• reproduced production silence with live logs
• confirmed @cloudflare/voice 0.3.5 is the latest published release and only accepts ArrayBuffer microphone frames
• focused production-config test passed
• full Desk check: 259 tests passed
• public readiness scan passed