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+/**
+ * `wrnexus generate docker` — scaffold containerization for a WrNexus app:
+ * a multi-stage Dockerfile (build with Bun → slim runtime), a .dockerignore,
+ * and a docker-compose.yml (app + Postgres). Uses the app's `/healthz` endpoint
+ * for the container health check.
+ */
+
+import { existsSync, writeFileSync } from "node:fs";
+import { join, resolve } from "node:path";
+
+const DOCKERFILE = `# syntax=docker/dockerfile:1
+# --- build stage: install deps + produce dist/server.js ---
+FROM oven/bun:1 AS build
+WORKDIR /app
+COPY package.json bun.lock* bun.lockb* ./
+RUN bun install
+COPY . .
+RUN bun run build
+
+# --- runtime stage: slim image with only the built server + migrations ---
+FROM oven/bun:1-slim AS runtime
+WORKDIR /app
+ENV NODE_ENV=production
+ENV PORT=3000
+COPY --from=build /app/dist ./dist
+COPY --from=build /app/app/db/migrations ./app/db/migrations
+EXPOSE 3000
+HEALTHCHECK --interval=30s --timeout=3s --retries=3 \\
+  CMD bun -e "fetch('http://localhost:'+(process.env.PORT||3000)+'/healthz').then(r=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"
+CMD ["bun", "dist/server.js"]
+`;
+
+const DOCKERIGNORE = `node_modules
+dist
+**/.wrnexus
+.git
+*.log
+*.db
+*.db-shm
+*.db-wal
+.DS_Store
+`;
+
+const COMPOSE = `services:
+  app:
+    build: .
+    ports:
+      - "3000:3000"
+    environment:
+      NODE_ENV: production
+      PORT: "3000"
+      DATABASE_URL: postgres://wire:wire@db:5432/app
+    depends_on:
+      db:
+        condition: service_healthy
+    restart: unless-stopped
+
+  db:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_USER: wire
+      POSTGRES_PASSWORD: wire
+      POSTGRES_DB: app
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U wire -d app"]
+      interval: 3s
+      timeout: 3s
+      retries: 20
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+
+volumes:
+  pgdata:
+`;
+
+function writeIfAbsent(path: string, content: string, name: string): void {
+  if (existsSync(path)) {
+    console.warn(`  • ${name} already exists — skipped`);
+    return;
+  }
+  writeFileSync(path, content, "utf8");
+  console.log(`  ✓ ${name}`);
+}
+
+/** Scaffold Dockerfile, .dockerignore, and docker-compose.yml into `appRoot`. */
+export function generateDocker(appRoot: string): void {
+  const root = resolve(appRoot);
+  console.log("Scaffolding containerization:");
+  writeIfAbsent(join(root, "Dockerfile"), DOCKERFILE, "Dockerfile");
+  writeIfAbsent(join(root, ".dockerignore"), DOCKERIGNORE, ".dockerignore");
+  writeIfAbsent(join(root, "docker-compose.yml"), COMPOSE, "docker-compose.yml");
+  console.log("\nBuild + run:  docker compose up --build");
+}