`cargo run --release -p gridcraft-xlsx --example write_perf -- [rows] [runs] [out.xlsx]`
builds a sales-style workbook (order ids, dates, categories, numbers, two
formula columns with cached values, booleans, sparse notes, a summary sheet)
and times write_xlsx, printing each run and the median / minimum. An optional
output path keeps the last package for byte comparisons between builds.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
