feat: implement skeleton phase

examples/docker-compose.yml

@@ -0,0 +1,20 @@
+# Minimal compose for the Phase 0 DoD: build the image, mount a
+# single-file user config, watch the process print its summary line
+# and exit cleanly.
+#
+# Real deployments add a postgres service, raycast-config.json bind,
+# ~/.config/claude bind, etc. — Phase 5 lives in a separate example
+# repo (see PLAN §5.1).
+
+services:
+  gateway:
+    build:
+      context: ..
+      dockerfile: Dockerfile
+    environment:
+      DATABASE_URL: "sqlite:///./gateway.db"
+      ADMIN_USER: "admin"
+      ADMIN_PASS: "change-me"
+      SESSION_SECRET: "dev-secret-change-me"
+    volumes:
+      - ./config.py:/config/config.py:ro