[Phase 2] Verify bundle size < 50 KB gzipped

[Robinsonchiziterem]

Summary

Run the production build and confirm the ESM bundle is under the 50 KB gzipped budget, using rollup-plugin-visualizer stats and manual gzip measurement.

Acceptance Criteria

• dist/index.js is < 50 KB when gzipped
• dist/stats.html is generated and visually reviewed
• If over budget: identify and tree-shake the largest contributor
• Bundle size is noted in a comment in README.md

Drip Wave

Complexity: Medium — 150 pts
Phase: 2 — Feature Complete