code-patterns

Reference patterns for REST APIs, pytest/vitest testing, Docker multi-stage builds, GitHub Actions CI/CD, PostgreSQL, TypeScript generics, Python async, and React Server Components. MUST BE USED when user asks about: "API design", "how to test", "Dockerfile", "CI/CD pipeline", "database schema", "TypeScript types", "async/await", "React hooks", "Next.js", "FastAPI", "testing pattern", "mock", "fixture", "docker compose", "github actions", "workflow yaml", "postgres query", "SQL pattern", "migration", "generic type", "server component", "use client", "use server", "middleware pattern", "error handling pattern", "retry logic". Includes code examples and validation commands. NOT for running tests (use smart-test-runner), security patterns (use security-audit), or git operations (use commit-message).