v1.20250918.0

What's Changed

• [build] Optimize all of V8 on CI to speed up tests by @fhanau in https://github.com/cloudflare/workerd/pull/5100
• Handle baseline snapshot during validation correctly by @dom96 in https://github.com/cloudflare/workerd/pull/5096
• Update Workers AI Types by @thatsKevinJain in https://github.com/cloudflare/workerd/pull/5111
• make stream attribute private in IncomingMessage by @anonrig in https://github.com/cloudflare/workerd/pull/5116

Full Changelog: https://github.com/cloudflare/workerd/compare/v1.20250917.0...v1.20250918.0