Gradio 6.15.0 adds caching, security fixes, and static worker offloading

The Gradio team has shipped version 6.15.0, a notable update for developers building interactive machine learning demos. The headline feature is the ability to apply `gr.cache()` directly to intermediate functions, allowing efficient memoization of computation-heavy steps without modifying the main interface logic. Additionally, traffic can now be offloaded to static workers using Node as a proxy, reducing load on the primary server and improving scalability for high-traffic apps.

On the security front, Gradio 6.15.0 isolates cookie jars in `/proxy=` requests to prevent malicious upstream Spaces from leaking cookies into proxied requests to different `*.hf.space` domains (GHSA-2mr9-9r47-px2g). Other fixes include a crash fix for `@gr.render` when inner `gr.Examples` trigger fake event keys, a default tool logic fix in `gr.ImageEditor`, and a warning when `gr.Tabs()` has non-Tab direct children. The release also adds Estonian language support and updates dependencies (handlebars to 4.7.9 for CVE-2026-33937). Contributors include abidlabs, thomwolf, freddyaboulton, hannahblair, and nine others.