A code review operating system for serious codebases: A practical JVM and Scala focused code review system: severity rubric, CI-friendly PR workflow, SOLID + FP patterns, checklists, Mermaid diagrams, and comment templates.

Stop letting invalid errors exist. Build smart constructors that validate at creation time, eliminate boolean flags with traits, and simplify code through better abstractions. Real refactor from llm4s removed 263 lines and added structure.