"""Expression — Layer 2's voice and motion choreography.

The subsystem that turns Core's intent to speak into audio on the body's
speaker. ``tts`` is the text-to-speech spine: a ``TtsEngine`` seam, a
Piper-backed backend behind an optional extra, a deterministic stub for tests,
and ``speak`` — synthesize, resample to 16 kHz, and stream to the HAL.
"""

from chittios_core.expression.tts import (
    DEFAULT_CHUNK_MS,
    TARGET_SAMPLE_RATE_HZ,
    PiperTtsEngine,
    StubTtsEngine,
    TtsEngine,
    TtsUnavailableError,
    speak,
)

__all__ = [
    "DEFAULT_CHUNK_MS",
    "TARGET_SAMPLE_RATE_HZ",
    "PiperTtsEngine",
    "StubTtsEngine",
    "TtsEngine",
    "TtsUnavailableError",
    "speak",
]