- Rewrite library in pure TypeScript with dual ESM/CJS exports
- Fix quadratic breakword performance on over-long words
- Node.js >= 14 required; removed unused dependencies (grapheme-splitter, array.prototype.flat polyfill)
- Fixed undeclared variable in strict mode

Dev-only: bumped mocha to ^12 to clear serialize-javascript advisories (GHSA-5c6j-r48x-rmvq, GHSA-qj8w-gfj5-8c6v)