Detect and prevent CRLF/LF line-ending problems in Windows-origin repositories and manuscripts. Use before editing files created by RStudio, Word-adjacent tooling, PowerShell, bash, Cowork, or Codex; when Git shows every line changed; when `.gitattributes`, `core.autocrlf`, NUL bytes, carriage returns, or noisy diffs appear; or before line-ending normalization work.
