Add Bilig WorkPaper formula readback example

[gregkonush]

Summary

Adds a TypeScript cookbook example that runs a Bilig WorkPaper formula-readback check inside an E2B sandbox.

The example installs @bilig/workpaper@0.157.0 inside the sandbox, edits an input cell, recalculates dependent formula cells, and verifies that exported WorkPaper JSON restores to the same computed result.

Why

Spreadsheet agents often need formula logic without driving Excel, LibreOffice, or a browser UI. This gives E2B users a small isolated pattern they can adapt for agent workflows that need formula write/readback.

Validation

• npm install in examples/bilig-workpaper-formula-readback-js
• npx tsc --noEmit --module NodeNext --moduleResolution NodeNext --target ES2022 --skipLibCheck index.ts
• npm run test in examples/bilig-workpaper-formula-readback-js
• git diff --check
• npm view @bilig/workpaper version returned 0.157.0
• npm exec --yes --package @bilig/workpaper@latest -- bilig-evaluate --door agent-mcp --json returned verified: true on @bilig/workpaper@0.157.0

The public evaluator verified 8 MCP tools, Inputs!B3 editing, expected ARR changing from 60000 to 96000, JSON persistence, restart readback at 96000, and package versions @bilig/workpaper@0.157.0 / xlsx-formula-recalc@0.157.0.

I did not run the live sandbox example here because this local shell does not have an E2B_API_KEY configured.

Notes

CLA is signed for this account.