Mandatory practices for reading, understanding, and maintaining project documentation (CLAUDE.md, ARCHITECTURE.md). This skill MUST be used for ALL coding tasks, ALL conversations, ALL projects, regardless of language or context. It defines non-negotiable rules for how to orient yourself in any codebase before doing any work. Trigger on every single interaction — any file edit, code review, bug fix, feature addition, refactoring, question about code, or any task that involves a project directory. There are no exceptions. Even if the user asks a simple question, these rules apply.