Add 25 world-class Claude Code skills for comprehensive software development

Created comprehensive skill collection covering all aspects of modern software
development with production-ready patterns, best practices, and detailed documentation.

## Skills Organized by Domain

### Code Quality & Architecture (2 skills)
- advanced-code-refactoring: SOLID principles, design patterns, refactoring patterns
- code-review: Automated/manual review, security, performance, maintainability

### API & Integration (2 skills)
- api-integration-expert: REST/GraphQL/WebSocket with auth, retry, caching
- graphql-schema-design: Schema design, resolvers, optimization, subscriptions

### Database & Data (3 skills)
- database-optimization: SQL/NoSQL tuning, indexing, query optimization
- data-pipeline: ETL/ELT with Airflow, Spark, dbt
- caching-strategies: Redis, Memcached, CDN, invalidation patterns

### Security & Authentication (2 skills)
- security-audit: OWASP Top 10, vulnerability scanning, security hardening
- auth-implementation: OAuth2, JWT, session management, SSO

### Testing & Quality (2 skills)
- test-automation: Unit/integration/E2E tests, TDD/BDD, coverage
- performance-profiling: CPU/memory profiling, Core Web Vitals optimization

### DevOps & Infrastructure (3 skills)
- docker-kubernetes: Containerization, orchestration, production deployments
- ci-cd-pipeline: GitHub Actions, automated testing, deployment strategies
- logging-monitoring: Observability with Datadog, Prometheus, Grafana, ELK

### Frontend Development (3 skills)
- frontend-accessibility: WCAG 2.1 compliance, ARIA, keyboard navigation
- ui-component-library: Design systems with React/Vue, Storybook
- mobile-responsive: Responsive design, mobile-first, PWAs

### Backend & Scaling (2 skills)
- backend-scaling: Load balancing, sharding, microservices, horizontal scaling
- real-time-systems: WebSockets, SSE, WebRTC for real-time features

### ML & AI (1 skill)
- ml-model-integration: Model serving, inference optimization, monitoring

### Development Tools (2 skills)
- git-workflow-optimizer: Git workflows, branching strategies, conflict resolution
- dependency-management: Package updates, security patches, version conflicts

### Code Maintenance (3 skills)
- error-handling: Robust error patterns, logging, graceful degradation
- documentation-generator: API docs, README, technical specifications
- migration-tools: Database/framework migrations with zero downtime

## Key Features

Each skill includes:
- YAML frontmatter with name, description, allowed tools
- Clear purpose and when to use
- Comprehensive capabilities overview
- Production-ready code examples
- Best practices and patterns
- Success criteria
- Tool-specific configurations

## Highlights

- 25 comprehensive skills covering full development lifecycle
- Production-ready patterns and examples
- Security-first approach throughout
- Performance optimization built-in
- Comprehensive testing strategies
- DevOps automation and infrastructure as code
- Modern frontend with accessibility focus
- Scalable backend architectures
- Data engineering and ML integration
- Advanced Git workflows

## File Structure

claude_skills/
├── README.md (comprehensive documentation)
├── advanced-code-refactoring/
│   ├── SKILL.md (main skill definition)
│   ├── reference.md (design patterns, SOLID principles)
│   └── examples.md (refactoring examples)
├── api-integration-expert/
│   └── SKILL.md (REST/GraphQL/WebSocket integration)
├── [23 more skills...]

Total: 25 skills + comprehensive README + supporting documentation

## Usage

Personal skills: cp -r claude_skills/* ~/.claude/skills/
Project skills: cp -r claude_skills/* .claude/skills/

Skills automatically activate based on context and description triggers.

claude_skills/ci-cd-pipeline/SKILL.md

@@ -0,0 +1,146 @@
+---
+name: ci-cd-pipeline
+description: Expert in CI/CD pipeline design and implementation using GitHub Actions, GitLab CI, Jenkins, and other tools. Use when setting up automated testing, deployment pipelines, or DevOps workflows.
+allowed-tools: Read, Write, Edit, Grep, Glob, Bash
+---
+
+# CI/CD Pipeline Expert
+
+## Purpose
+Design and implement automated CI/CD pipelines for testing, building, and deploying applications.
+
+## Capabilities
+- GitHub Actions, GitLab CI, Jenkins
+- Automated testing in CI
+- Build and artifact management
+- Multi-environment deployments
+- Blue-green and canary deployments
+- Rollback strategies
+- Secret management in CI/CD
+- Pipeline monitoring and notifications
+
+## GitHub Actions Example
+```yaml
+name: CI/CD Pipeline
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main]
+
+env:
+  NODE_VERSION: '18'
+  REGISTRY: ghcr.io
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: 'npm'
+      
+      - name: Install dependencies
+        run: npm ci
+      
+      - name: Run linter
+        run: npm run lint
+      
+      - name: Run tests
+        run: npm test -- --coverage
+      
+      - name: Upload coverage
+        uses: codecov/codecov-action@v3
+        with:
+          files: ./coverage/lcov.info
+      
+      - name: Build
+        run: npm run build
+
+  security-scan:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      
+      - name: Run Snyk
+        uses: snyk/actions/node@master
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+      
+      - name: Run npm audit
+        run: npm audit --audit-level=high
+
+  build-and-push:
+    needs: [test, security-scan]
+    if: github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    
+    steps:
+      - uses: actions/checkout@v3
+      
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      
+      - name: Login to Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository }}
+          tags: |
+            type=sha,prefix={{branch}}-
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+      
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  deploy:
+    needs: build-and-push
+    runs-on: ubuntu-latest
+    environment: production
+    
+    steps:
+      - name: Deploy to Kubernetes
+        uses: azure/k8s-deploy@v4
+        with:
+          manifests: |
+            k8s/deployment.yaml
+            k8s/service.yaml
+          images: |
+            ${{ env.REGISTRY }}/${{ github.repository }}:${{ github.sha }}
+      
+      - name: Verify deployment
+        run: |
+          kubectl rollout status deployment/myapp
+          kubectl get pods
+```
+
+## Success Criteria
+- ✓ Pipeline runs < 10min
+- ✓ Automated tests pass
+- ✓ Security scans pass
+- ✓ Zero-downtime deployments
+- ✓ Rollback capability
+- ✓ Notifications on failure
+