updated

Dockerfile

@@ -17,10 +17,11 @@ RUN npm install --omit=dev --no-audit --no-fund || true
 
 COPY src ./src
 
-# Run as an unprivileged user rather than root.
-RUN useradd --create-home --uid 1000 claude \
-    && chown -R claude:claude /app
-USER claude
+# Run as an unprivileged user rather than root. The node:*-slim base image
+# already ships a "node" user at uid 1000, so reuse it instead of creating
+# a new one (useradd at the same uid fails with exit code 4, "UID in use").
+RUN chown -R node:node /app
+USER node
 
 ENV NODE_ENV=production
 EXPOSE 3000