v1.20250830.0

What's Changed

• EW-9282 EW-9451 Further fix errors with Onset event being reported too late by @fhanau in https://github.com/cloudflare/workerd/pull/4935
• Remove EW-9548 TODO as it turns out it's no longer required. by @dom96 in https://github.com/cloudflare/workerd/pull/4937
• Revert "Update src/workerd/api/streams/queue.h" by @jasnell in https://github.com/cloudflare/workerd/pull/4938
• update workerd-cxx by @anonrig in https://github.com/cloudflare/workerd/pull/4941
• Restrict JSG_STRUCT from having v8 local members by @jasnell in https://github.com/cloudflare/workerd/pull/4916

Full Changelog: https://github.com/cloudflare/workerd/compare/v1.20250829.0...v1.20250830.0