Add Docker configuration and CI/CD pipeline

Author: m-prosper-10

.dockerignore

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+.git
+.github
+node_modules
+dist
+coverage
+test-output
+*.tgz
+.codex
+.agents
+.kiro
+.vscode
+.idea
+.DS_Store

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+      - master
+      - develop
+      - "feature/**"
+  pull_request:
+
+jobs:
+  quality:
+    name: Build and Test (Node ${{ matrix.node-version }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [18, 20]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Test
+        run: npm test
+
+      - name: CLI help smoke test
+        run: node dist/cli.js --help
+
+      - name: Package smoke test
+        run: npm pack --dry-run

Dockerfile

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+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY tsconfig.json ./
+COPY src ./src
+RUN npm run build
+
+FROM node:20-alpine AS runtime
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev && npm cache clean --force
+
+COPY --from=builder /app/dist ./dist
+COPY README.md QUICK_START.md USAGE.md ./
+
+ENTRYPOINT ["node", "dist/cli.js"]