1.1.0

Added

• Interactive browser playground (playground/) with live evaluation, a searchable
  function menu, and support for units, fractions, big numbers, and matrices.
• GitHub Actions workflow to build and deploy the playground to GitHub Pages.
• TypeScript declaration generation (npm run build:types) with dedicated
  tsconfig.types.json output to dist/index.d.ts.
• Standalone test runner (tools/test.js) that discovers and runs every test file,
  plus DOM test helpers and playground unit/DOM test suites.
• npm run typecheck script for validating TypeScript declarations.
• GitHub Sponsors funding configuration.

Changed

• Migrated the build pipeline from Rollup to Guchho.
• Updated package entry points for CommonJS, ESM, browser, and type declarations.
• Test command now rebuilds the bundles before running the full test suite.
• Updated README and CONTRIBUTING for the new build and playground workflow.
• Requires Node.js 18 or newer.

Removed

• Legacy examples/react and examples/vanilla-js projects, superseded by the playground.
• Rollup configuration and Rollup-based build dependencies.
• Standalone ESLint, Prettier, and EditorConfig configurations in favor of the
  Guchho-based workflow.

Fixed

• Improved test reliability with dedicated DOM helpers and cross-platform script handling.