Core Changes

• fix: preserve cache behavior for PPR fallback shells with root params: #88556
• Upgrade React from d2908752-20260119 to b546603b-20260121: #88860

Misc Changes

• Turbopack: Use a real file entrypoint for Workers (and SharedWorkers): #88602
• Turbopack: Add file write invalidation tracking to filesystem watcher fuzzing: #88665
• Turbopack: Move fuzzer for fs watcher into a separate file/module: #88666
• Turbopack: Add a stress test / fuzzer that tries creating many symlinks in a tight loop: #88667

Credits

Huge thanks to @ztanner, @mmastrac, and @bgw for helping!