Core Changes

• [strict-route-types] Typecheck App Router page props: #87386
• [strict-route-types] Enforce common React Component return types in App Router: #87389
• [strict-route-types] Switch to satisfies when validating page and route modules: #87398
• [strict-route-types] Don't reject number in config.api.bodyParser.sizeLimit when validating route: #87633
• Revert "dx: avoid next-env.d.ts change in dev": #88153
• [strict-route-types] Typecheck pages router routes in absence of App Router: #87628
• [strict-route-types] Ensure cache profiles and routes are type-checked even if .next is excluded: #87768

Misc Changes

• [turbopack] Populate the names field of sourcemaps: #87911
• Turbopack: fix order of breadth first edges: #88117
• Turbopack: transpile CHUNK_SUFFIX: #88128
• chore: add dev boot profiling and benchmark scripts: #87940
• perf: improve stats action reliability and reduce CI noise: #87945

Credits

Huge thanks to @lukesandberg, @sokra, @eps1lon, @mischnic, and @feedthejim for helping!