Error Taxonomy - Structured Error Classification Unified error classification system ensuring every error in the stack has a code, category, severity, and user-facing message. Bridges the FastAPI model with the Next.js class. Description Provides a structured error code taxonomy following the format. Maps every runtime error to an HTTP status code, severity level, and user-facing message, ensuring consistent error handling between the FastAPI backend and Next.js frontend. When to Apply Positive Triggers - Creating or modifying API error responses - Adding new raises in FastAPI routes - Implem…