v1.20250820.0

What's Changed

• Store the VFS in the Script/Context embedder data by @jasnell in https://github.com/cloudflare/workerd/pull/4821
• Remove experimental from python_workflows compat flag by @Caio-Nogueira in https://github.com/cloudflare/workerd/pull/4806
• Python: Don't define error handling handlers in workerd when Default class exists by @hoodmane in https://github.com/cloudflare/workerd/pull/4826
• Check for missing function names in getCallSites. by @erikcorry in https://github.com/cloudflare/workerd/pull/4824
• Land a couple of patches from the downstream project by @jasnell in https://github.com/cloudflare/workerd/pull/4827
• fix ubsan impl unequal size error by @mikea in https://github.com/cloudflare/workerd/pull/4820
• EW-9282 EW-9367 Add STW onset event size limit by @fhanau in https://github.com/cloudflare/workerd/pull/4809
• Fixup some crypto dh checks by @jasnell in https://github.com/cloudflare/workerd/pull/4828
• update workerd-cxx by @anonrig in https://github.com/cloudflare/workerd/pull/4829
• Revert "Refactor headers and improve performance (#4494)" by @jasnell in https://github.com/cloudflare/workerd/pull/4830
• Remove the unused JSG_LAZY_JS macros by @jasnell in https://github.com/cloudflare/workerd/pull/4835

Full Changelog: https://github.com/cloudflare/workerd/compare/v1.20250819.0...v1.20250820.0