Step 1: frasario audio Piper (render + play) con struttura a componenti

- config/: phrases.json (mappa phrase_id->testo) e config.json (voce, output dir)
- src/tts/: render.py (render incrementale) e play.py (riproduzione, no rete)
- clips/ e voices/ gitignorati (artefatti generati / modelli scaricati)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,12 @@
+# Generated audio artifacts — never committed
+clips/
+
+# Downloaded Piper voice models (large binaries; fetch with download_voices)
+voices/
+
+# Python
+__pycache__/
+*.pyc
+
+# Editor (personal, machine-specific)
+.vscode/