voice-in-groq: arecord → Groq whisper-large-v3 voice-in channel

[webdevtodayjason]

Summary

• Adds src/channels/voice-in.ts: createVoiceInChannel with start / stop / abort plus VoiceInError.
• start() spawns arecord (injectable) and buffers PCM in memory.
• stop() SIGTERMs arecord, uploads buffered WAV multipart to https://api.groq.com/openai/v1/audio/transcriptions with model=whisper-large-v3, language=en, response_format=json, publishes a bus prompt message, returns transcript.
• abort() kills arecord without upload.
• No temp files, Node built-ins only, strict TS (no any).

Validation

• pnpm check → exit 0
• pnpm test tests/channels/voice-in.test.ts → 4/4 passing

Task: 021 engineer-router. Contract: ops/contracts/engineer-router.contract.md.

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