Core Changes

• Improve lock dir error message: #89119
• Ensures browserslist doesn't issue outdated warnings for baseline-browser-mapping: #89287
• Replace build id in Pages data routes with deployment id: #88959
• Upgrade React from 230772f9-20260128 to da641178-20260129: #89301
• Inline handler dependencies instead of tracing: #89269
• Turbopack: add rules.*.type config to allow changing the type of a module: #88788
• Add experimental.varyParams feature flag: #89307

Misc Changes

• Turbopack: improve print_cache_item_size: #89279

Credits

Huge thanks to @huozhi, @eps1lon, @mischnic, @ijjk, @sokra, and @acdlite for helping!