Probes the Edge TPU in a subprocess before loading — catches segfaults
(libedgetpu ABI mismatch on Debian Trixie/Python 3.13) and falls back
to CPU automatically. No more service crashes on Coral incompatibility.
When the runtime is eventually fixed, Edge TPU will be used automatically
with no config changes needed.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds voice-based speaker ID triggered by YAMNet speech detection.
New speaker_id.py module with SQLite-backed voice enrollment and
cosine similarity matching. Endpoints: POST /speakers/enroll,
POST /speakers/enroll-from-mic, GET /speakers, DELETE /speakers/{name}.
Orange LED animation during enrollment.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
New sound_id.py module with SoundClassifier class that runs YAMNet
(521 audio event categories) on CPU TFLite. Classifies audio every
0.5s from a ring buffer fed by the existing audio stream.
Categories: speech, alert, music, animal, household, environment, silence.
Smoothing via 20-sample history window for stable dominant category.
New endpoints: GET /sounds, GET /sounds/history
Updated: /health (sound_classification_enabled), /status (audio_scene)
Graceful degradation if model files not present.
Model download (not tracked in git):
curl -sL 'https://tfhub.dev/google/lite-model/yamnet/classification/tflite/1?lite-format=tflite' -o models/yamnet.tflite
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
