Core Changes

• Turbopack: more dead code: #88505
• fix(build): prevent route handler manifests from inheriting unrelated client components: #88419
• Upgrade React from 65eec428-20251218 to 3e1abcc8-20260113: #88530
• Better typesafety for interopDefault: #88486
• keep next-env.d.s unchanged between dev and build: #88428
• Remove sibling caches from CacheNode tree: #87991
• Upgrade React from 3e1abcc8-20260113 to 4a3d993e-20260114: #88547
• Finish deleting Mutable from router implementation: #88046

Misc Changes

• Remove lerna bootstrap from the clean script in package.json: #88527
• docs: add useSearchParams and useParams documentation for Pages Router: #88429
• Turbopack: Clean up VcRead::Repr associated type: #88456
• [cna] Avoid error with out-of-box Netlify config: #88546
• [turbopack] Move some of the logic for issue filtering into the rust layer: #88511
• Update Rspack production test manifest: #88469
• Update Rspack development test manifest: #88470

Credits

Huge thanks to @mischnic, @timneutkens, @unstubbable, @huozhi, @acdlite, @bgw, @karlhorky, @lukesandberg, and @vercel-release-bot for helping!