feat: establish voice assistant V1 baseline

tests/test_audio_models.py

@@ -0,0 +1,31 @@
+"""
+Tests for the canonical Voice Assistant audio contract.
+
+Purpose:
+    Verify that the Voice Core exposes the expected provider-independent
+    canonical audio format.
+"""
+
+import pytest
+from pydantic import ValidationError
+
+from voice_assistant.audio.models import (
+    AudioFormat,
+    CANONICAL_AUDIO_FORMAT,
+)
+
+
+def test_canonical_audio_format():
+    assert CANONICAL_AUDIO_FORMAT.encoding == "pcm_s16le"
+    assert CANONICAL_AUDIO_FORMAT.sample_rate == 16000
+    assert CANONICAL_AUDIO_FORMAT.channels == 1
+
+
+def test_audio_format_rejects_unsupported_encoding():
+    with pytest.raises(ValidationError):
+        AudioFormat(
+            encoding="mp3",
+            sample_rate=16000,
+            channels=1,
+        )
+