Ports legacy LaTeX (LaTeX 2.09 / plain TeX patterns) to modern LaTeX2e — replaces \bf/\it/\sl/\sc/\rm/\sf/\tt with \textXX{} or \XXshape; eqnarray to align; $$ ... $$ to \[...\]; \centerline to \centering; \epsfig to \includegraphics; drops obsolete inputenc/fontenc lines on modern engines. Each rewrite is conservative — only applied when the modern equivalent is provably correct. Use when the user asks to modernize, port old LaTeX, or compile fails on deprecated commands. Delegates to /academic-latex:docs-lookup before claiming a non-trivial mapping.
