LOAD FILE MUTATE RENDER WRITE READ SAVE CSV INPUT / STDIN TUI PATH [ CURSOR ] < MODAL EDIT > CLI PATH $ sheets set B7=10 $ sheets get A1 SHARED MODEL OUTPUT / CSV Reads initial state from CSV file or standard input. Interactive terminal UI with cursor routing and modal editing. Single-command execution for reading or writing specific cells. Shared sparse grid holding the active spreadsheet state. Serializes current grid state to stdout or a saved file.