Analyze this workbook and build a pivot table.
$npx -y skills add slanchaai/ingot --skill xlsxInstalls into the current project.
Run `npx skills use "https://github.com/slanchaai/ingot" --skill "slanchaai/ingot/xlsx"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/slanchaai/ingot" that are relevant to the current task. Run `npx skills add "https://github.com/slanchaai/ingot"` and select the relevant skills, then follow their instructions.