Add Docker Compose setup for web chat and email worker

Two services sharing a single image:
- web: Chainlit chat interface on port 8000
- email-worker: IMAP polling agent (main.py)

./data is mounted for persistent storage (registrations + conversations).
./openspec is mounted read-only so knowledge-base markdown files can be
edited on the host without rebuilding the image.

Configuration via .env (see .env.example).

https://claude.ai/code/session_015tJePX9eyQENYpJUF8XvvK

docker-compose.yml

@@ -0,0 +1,26 @@
+services:
+
+  # Web chat interface — Chainlit served at http://localhost:8000
+  web:
+    build: .
+    command: chainlit run chat_app.py --host 0.0.0.0 --port 8000
+    ports:
+      - "8000:8000"
+    env_file: .env
+    volumes:
+      # Persistent storage for conversations and completed registrations
+      - ./data:/app/data
+      # Knowledge-base markdown files — edit on the host, no rebuild needed
+      - ./openspec:/app/openspec:ro
+    restart: unless-stopped
+
+  # Email polling agent — checks the inbox every POLL_INTERVAL seconds
+  email-worker:
+    build: .
+    command: python main.py
+    env_file: .env
+    volumes:
+      # Shares the same data directory as the web service
+      - ./data:/app/data
+      - ./openspec:/app/openspec:ro
+    restart: unless-stopped