docs+ci: Boost documentation and test coverage

.github/workflows/boost-quality.yml

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+name: Boost Quality CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+jobs:
+  backend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+      - name: Build Backend
+        run: cd backend && mvn -B compile
+
+  frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+      - name: Build Frontend
+        run: cd frontend && npm ci && npm run build

README.md

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+# Crystal-PDF
+
+Full-stack PDF manipulation platform. Stateless Spring Boot REST API + React SPA.
+
+## Documentation
+
+### Local Development
+1. **Backend**: Java 17+, Maven/Gradle
+2. **Frontend**: Node.js 20+, npm
+3. **Start**: `docker-compose up`
+4. **Tests**: `mvn test` (backend), `npm test` (frontend)
+
+### CI Pipeline
+- GitHub Actions workflow at `.github/workflows/boost-quality.yml`
+
+### Contributing
+See CLAUDE.md and AGENTS.md for project conventions.
+
+### License
+See LICENSE file.