auth-patterns

This skill should be used when the user asks to "implement authentication", "set up JWT auth", "configure OAuth2", "implement RBAC", "add MFA/two-factor", "secure session management", or mentions "authentication", "authorization", "JWT", "OAuth", "login", "session management", "password hashing", "RBAC", "role-based access", "MFA", "two-factor", "API keys", "token refresh", "CSRF", "CORS with auth". Provides authentication and authorization patterns including JWT, OAuth2, session management, RBAC, MFA, and password security.