feat(serve): manage Whisper ASR as child process (#136)#137
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kotoba serve now automatically spawns a Whisper ASR server (via uv run + faster-whisper + FastAPI) as a managed child process. No manual Python service startup needed. - New src/serve/asr.rs: WhisperProcess lifecycle manager (find free port, write embedded script, spawn via uv, TCP-poll ready, kill_on_drop cleanup) - New src/serve/whisper_server.py: embedded minimal ASR server - AppState carries the managed ASR URL; voice pipeline uses it by default - VoiceParams.asr_url is now Option<String> — falls back to managed URL - Graceful degradation: if uv/Python not available, logs warning and continues without managed ASR Closes #136 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Closes #136. kotoba serve auto-starts Whisper ASR. Falls back gracefully if uv not available.