feat: FRIDAY Voice stack on the GPU machine; VoiceCoach history

FRIDAY Voice (speaches GPU STT/TTS + hermes agent + push-to-talk console) on
.150 Docker Desktop, fronted by coach.hobbs.farm. Also captures the VoiceCoach
compose/agent trees and deploy notes it replaced, which had never been committed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

compose/hf-pdocker-01/voicecoach/piper-service/main.py

@@ -0,0 +1,72 @@
+"""
+Piper TTS HTTP service.
+Self-hosted text-to-speech, internal network only.
+"""
+import io
+import logging
+import os
+import wave
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI, HTTPException
+from fastapi.responses import Response
+from pydantic import BaseModel
+import piper
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+MODEL_PATH = os.getenv("PIPER_MODEL", "/app/models/en_US-lessac-medium.onnx")
+voice = None
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    global voice
+    logger.info(f"Loading Piper model: {MODEL_PATH}")
+    voice = piper.PiperVoice.load(MODEL_PATH)
+    logger.info("Piper TTS ready.")
+    yield
+    logger.info("Shutting down.")
+
+
+app = FastAPI(title="Piper TTS Service", lifespan=lifespan)
+
+
+class TTSRequest(BaseModel):
+    text: str
+    speaker_id: int = None
+    length_scale: float = 1.0
+    sentence_silence: float = 0.2
+
+
+@app.get("/health")
+async def health():
+    if voice is None:
+        raise HTTPException(status_code=503, detail="Model not loaded")
+    return {"status": "ok", "model": os.path.basename(MODEL_PATH)}
+
+
+@app.post("/synthesize")
+async def synthesize(req: TTSRequest):
+    if voice is None:
+        raise HTTPException(status_code=503, detail="Model not loaded")
+
+    if not req.text.strip():
+        raise HTTPException(status_code=400, detail="Empty text")
+
+    buf = io.BytesIO()
+    with wave.open(buf, "wb") as wf:
+        synth_kwargs = {
+            "length_scale": req.length_scale,
+            "sentence_silence": req.sentence_silence,
+        }
+        if req.speaker_id is not None:
+            synth_kwargs["speaker_id"] = req.speaker_id
+        voice.synthesize(req.text, wf, **synth_kwargs)
+
+    return Response(
+        content=buf.getvalue(),
+        media_type="audio/wav",
+        headers={"Content-Disposition": "inline; filename=speech.wav"},
+    )