Add fully local conversational AI pipeline for Reachy Mini

Local STT (Qwen3-ASR), VLM (Gemma 4 26B-A4B), and TTS (Spark-TTS) running
on Apple Silicon via MLX, with bracket-tag action system for nod, shake,
wiggle, dance, photo, and pre-recorded emotions.

.gitignore

@@ -0,0 +1,29 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+.venv/
+venv/
+*.egg-info/
+
+# macOS
+.DS_Store
+
+# Editor
+.vscode/
+.idea/
+*.swp
+
+# Project-local — user data and generated artifacts
+.claude/
+CLAUDE.md
+photos/
+*.wav
+*.aiff
+*.jpg
+*.png
+*.mp3
+
+# Logs / scratch
+*.log
+/tmp/