Agents - Inspect Voice Agent turn latency and outcomes

@cloudflare/voice v0.4.0 introduces enhanced turn-level diagnostics for real-time Voice Agents on Cloudflare Agents. Prior to this release, the package only provided four aggregate metrics covering successful, non-empty speech turns. The update introduces the turnmetrics event emitting a typed VoiceTurnMetrics object for speech and text turns. Key capabilities of the new metrics include: - Correlation via a unique turnId . - Explicit terminal outcomes: completed , no output , output limit , content filtered , model error , tts error , or aborted , helping developers differentiate why audio was not generated. - Stage-specific latency measurements: speech-to-final-transcript, model-to-first-text, TTS-to-first-audio, and overall turn duration ( turnTotalMs ). Metrics for unreached stages are omitted, and recorded stages may overlap. These summaries can be accessed via VoiceClient.addEventListener('turnmetrics', ...) , useVoiceAgent() , or useVoiceInput() (which provides only speech and transcription timings).

• Upgrade @cloudflare/voice to v0.4.0 or later.
• Subscribe to the 'turnmetrics' event on VoiceClient or access turn metrics via useVoiceAgent/useVoiceInput to handle failure modes and track turn latency.