Initial commit — voice pipeline experiment

STT (Silero VAD + Whisper via sherpa-onnx), Chatterbox TTS HTTP server,
query completeness classifier (Ollama), multi-voice demo scripts, and
planning docs. Kept as reference; clean rewrite planned in separate repos.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,11 @@
+node_modules/
+models/
+venv/
+*.ogg
+*.wav
+*.mp3
+*.onnx
+*.bin
+package-lock.json
+__pycache__/
+*.pyc