A dependency-free JavaScript helper for concrete calculator embeds

Publisher sites can now use the public concrete-estimator-embed helper to generate an iframe URL or browser iframe element for Concrete Estimator Hub calculators.

• Publisher guide: https://concreteestimatorhub.com/resources/calculators-for-your-site
• Public source: https://github.com/xuhp630-bot/concrete-estimator-hub-calculators/tree/main/packages/concrete-estimator-embed
• Release archive: https://github.com/xuhp630-bot/concrete-estimator-hub-calculators/releases/tag/js-embed-v0.1.0
• Full slab calculator: https://concreteestimatorhub.com/concrete-slab-calculator

The helper is dependency-free, supports nine concrete planning routes, clamps iframe height, uses lazy loading, and leaves attribution under publisher control. It does not inject hidden links or forced credits.