Core Changes

• Error when accessing undefined root params in generateStaticParams: #91519
• Buffer prefetch response before passing to Flight client: #91487
• [Segment Cache] Always upsert on prefetch completion: #91488
• Track vary params during runtime prefetches: #89297
• [react-sync] Allow locking in manual sync: #91509
• Remove devCacheControlNoCache experimental option (hard-code no-cache): #91503
• fix allowedDevOrigins for no-cors requests: #91506
• Remove webpack stats generation from Turbopack: #91515
• Upgrade React from c80a0750-20260312 to 3f0b9e61-20260317: #91522
• Move adapterPath from experimental to stable top-level config: #91535
• block disallowed dev origins by default: #91507

Misc Changes

• perf(turbopack-node): zero-copy Buffer transfer from node to rust: #91376
• docs(turbopack-core): Copy "layers" documentation from mdbook to rustdoc: #91350
• Turbopack: correctly apply effects for issue snapshots: #91511
• Turbopack: treat unknown CSS selectors as warnings: #91513
• docs(turbopack): Migrate chunking docs from mdbook, with proof-reading and minor updates from claude: #91472
• Skip catch-error-react-compiler test to unblock CI: #91528
• [turbopack] update qfilter to 0.3.0-alpha: #91467
• Unflake two "use cache" tests: #91529
• docs(turbopack): Remove old architecture.md file from turbopack crate: #91473

Credits

Huge thanks to @xusd320, @bgw, @mischnic, @unstubbable, @acdlite, @eps1lon, @devjiwonchoi, @lukesandberg, @sokra, @ztanner, and @timneutkens for helping!