Bug Description

OpenClaw Mac app crashes immediately on launch with SIGABRT when no microphone/audio input device is available and voice wake is enabled.

Environment

• OS: macOS (Darwin 25.2.0, arm64)
• Hardware: Mac Mini M4 (no built-in microphone)
• OpenClaw: 2026.2.6
• Node: v22.22.0

Steps to Reproduce

1. Mac Mini M4 with no built-in microphone
2. AirPods (or other Bluetooth audio) disconnected — zero audio input devices available
3. Launch OpenClaw Mac app with voice wake enabled
4. App crashes immediately

Crash Details

• Crash occurred 7 times in 7 minutes (app repeatedly relaunches and crashes)
• Crash trace: VoiceWakeRuntime.start() → AVAudioEngineImpl::InstallTapOnNode → SIGABRT
• InstallTapOnNode is called unconditionally without checking for available audio input devices

Attempted Workarounds (none worked)

• Setting voiceWakeMicName to empty string — still crashes
• Setting voiceWakeMicName to "none" — still crashes
• Deleting all voice wake user defaults — still crashes

Only Working Fix

Connecting an audio input device (e.g., AirPods) before launching the app.

Expected Behavior

The app should gracefully handle the absence of audio input devices:

• Check for available audio inputs before calling InstallTapOnNode
• If no mic is available, disable voice wake with a user-visible warning
• Do not crash — allow the app to function normally without voice wake

Impact

Mac Mini (and other headless/mic-less Macs) cannot use the native app reliably. Any Bluetooth audio disconnection causes immediate crash loop.