Set up a LaTeX paper project with per-section .tex files. Trigger when the user says "set up paper structure", "split my tex file into sections", "create section files", "set up Overleaf repo", "initialize paper", or asks to organize a LaTeX project for collaborative or skill-based writing. This skill creates stub .tex files for each section and inserts \input{} lines into the main .tex file without modifying existing content.