"""Stage 2 — Audio Feature Extraction (Placeholder).

Will be implemented with librosa/openSMILE during fine-tuning phase.
Currently returns empty dict to maintain interface compatibility.
"""


def extract_features(audio_path: str) -> dict:
    """Placeholder — extract audio features for future use.

    Args:
        audio_path: Path to 16kHz mono WAV segment file.

    Returns:
        Empty dict (placeholder for librosa/openSMILE features).
    """
    return {}